Journal articles: 'Oblique aerial photography'

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Matthews, M. C., and C. R. I. Clayton. "The Use of Oblique Aerial Photography to Investigate the Extent and Sequence of Landslipping at Stag Hill, Guildford, Surrey." Geological Society, London, Engineering Geology Special Publications 2, no. 1 (1986): 309–15. http://dx.doi.org/10.1144/gsl.1986.002.01.54.

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AbstractThe University of Surrey is situated on the northern slopes of Stag Hill, below Guildford Cathedral, which occupies the summit. During the investigation for the design of the University, it became apparent that the site was underlain by a large landslip, 500 m wide from east to west and extending 160 m from rear scarp to toe. Considerable effort was made to establish its geometry and extent (Skempton & Petley (1967), and Morgenstern & Tchalenko (1967)).In recent years it was realised that because the construction of the Cathedral extended over a long period of time, the likelihood of Stag Hill being covered by oblique aerial photography would be high. Some forty oblique aerial photographs, spanning the period 1949 to 1982, were collected and analysed together with vertical aerial photographs and topographic maps.Although the landslip is visible on vertical aerial photographs, individual elements are not easily identified. Using oblique photography, in particular that in which recognition of subdued topography has been enhanced by low sun angles, up to six phases of landslipping were identified.This paper uses this example to demonstrate the usefulness of aerial photography in site investigation and in particular the value of oblique photography, a topic which receives little attention in BS 5930:1981 considering how cost effective this tool can be.

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Cai, Z., W. Liu, G. Luo, and Z. Xiang. "STUDY ON PRACTICAL TECHNOLOGIES OF AERIAL TRIANGULATION FOR REAL SCENE 3D MOELING WITH OBLIQUE PHOTOGRAPHY." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 119–21. http://dx.doi.org/10.5194/isprs-archives-xlii-3-119-2018.

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The key technologies in the real scene 3D modeling of oblique photography mainly include the data acquisition of oblique photography, layout and surveying of photo control points, oblique camera calibration, aerial triangulation, dense matching of multi-angle image, building of triangulation irregular network (TIN) and TIN simplification and automatic texture mapping, among which aerial triangulation is the core and the results of aerial triangulation directly affect the later model effect and the corresponding data accuracy. Starting from this point of view, this paper aims to study the practical technologies of aerial triangulation for real scene 3D modeling with oblique photography and finally proposes a technical method of aerial triangulation with oblique photography which can be put into practice.

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Zhu, X., G. Pang, and C. Chen. "RESEARCH AND APPLICATION OF HISTORICAL 3D MODELING BASED ON ARCHIVED NON-OBLIQUE AERIAL PHOTOS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2020 (August 12, 2020): 555–60. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2020-555-2020.

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Abstract. Nowadays, the oblique and multi-view, large-overlap aerial photography and airborne LiDAR are the main sources to build the 3D scene model. However, most of our archived aerial photos are acquired by non-oblique, normal photography. Because of low resolution, low overlay and poor model texture, there were less relative research and application. With the development of pixel-level matching technology, especially the application of Semi-Global Matching (SGM) and Multi-View Stereo (MVS) algorithm, the normal (non-oblique, non-large overlap) aerial photos could also be explored to restore the dense Digital Surface Model (DSM) and 3D scene model. In this paper, the method of the 3D scene modelling with the non-oblique aerial photos are summarized into 4 steps consisting of Data preprocessing, Ground Control Points (GCPs) collection and aerial triangulation (AT), DSM extraction and editing, 3D modelling and visualization. For the archived non-oblique aerial photos, including the aerial photographic films, digital frame photos and push-broom aerial data, the key steps of the 3D modelling method with these non-oblique aerial photos are discussed. Based on the experiments, the method can effectively explore the archived normal aerial data for large range restoration, 3D restoration, time series change detection and etc., providing new valuable spatio-temporal data for the urban historical research.

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Wang, Zehong, and Long Xiao. "Research on relative orientation method of oblique aerial photography based on basic matrix." Journal of Physics: Conference Series 2093, no. 1 (November 1, 2021): 012025. http://dx.doi.org/10.1088/1742-6596/2093/1/012025.

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Abstract After the oblique aerial photography technology is used to collect the stereo image, it is necessary to use the relative orientation method to check the image parameters. After the rectification process is completed, the 3D software is used to draw the 3D model to meet the subsequent application requirements. The author of this paper analyzes the difficulty of the matching and aerial photography, including affine transformation cannot successful transformation, influence there covered phenomenon and characteristic finishing is difficult, the combination of fundamental matrix tilt aerial photography as a method of relative orientation, through the study of oblique aerial photography based matrix as precision control points, its aim is to continuously optimize tilt aerial photography as the content, improve the use value of collation results.

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Carbonetto, Kim. "The National Air Photo Library." Research Notes 12, no. 1 (October 23, 2013): 67–72. http://dx.doi.org/10.7202/1018997ar.

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The National Air Photo Library holds more than four million photographs. Complete coverage of the country, including its towns and cities, is available. Many places have been the subject of vertical, oblique, and scenic aerial photography from the beginning of the service in the 1920s.

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Che, Yingpu, Qing Wang, Ziwen Xie, Long Zhou, Shuangwei Li, Fang Hui, Xiqing Wang, Baoguo Li, and Yuntao Ma. "Estimation of maize plant height and leaf area index dynamics using an unmanned aerial vehicle with oblique and nadir photography." Annals of Botany 126, no. 4 (May 20, 2020): 765–73. http://dx.doi.org/10.1093/aob/mcaa097.

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Abstract Background and Aims High-throughput phenotyping is a limitation in plant genetics and breeding due to large-scale experiments in the field. Unmanned aerial vehicles (UAVs) can help to extract plant phenotypic traits rapidly and non-destructively with high efficiency. The general aim of this study is to estimate the dynamic plant height and leaf area index (LAI) by nadir and oblique photography with a UAV, and to compare the integrity of the established three-dimensional (3-D) canopy by these two methods. Methods Images were captured by a high-resolution digital RGB camera mounted on a UAV at five stages with nadir and oblique photography, and processed by Agisoft Metashape to generate point clouds, orthomosaic maps and digital surface models. Individual plots were segmented according to their positions in the experimental design layout. The plant height of each inbred line was calculated automatically by a reference ground method. The LAI was calculated by the 3-D voxel method. The reconstructed canopy was sliced into different layers to compare leaf area density obtained from oblique and nadir photography. Key Results Good agreements were found for plant height between nadir photography, oblique photography and manual measurement during the whole growing season. The estimated LAI by oblique photography correlated better with measured LAI (slope = 0.87, R2 = 0.67), compared with that of nadir photography (slope = 0.74, R2 = 0.56). The total number of point clouds obtained by oblique photography was about 2.7–3.1 times than those by nadir photography. Leaf area density calculated by nadir photography was much less than that obtained by oblique photography, especially near the plant base. Conclusions Plant height and LAI can be extracted automatically and efficiently by both photography methods. Oblique photography can provide intensive point clouds and relatively complete canopy information at low cost. The reconstructed 3-D profile of the plant canopy can be easily recognized by oblique photography.

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Warner, W. S., and L. E. Blankenberg. "Bundle Adjustment For 35 mm Oblique Aerial Photography." Photogrammetric Record 15, no. 86 (October 1995): 217–24. http://dx.doi.org/10.1111/0031-868x.00027.

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Liu, P., Y. C. Li, W. Hu, and X. B. Ding. "Segmentation and Reconstruction of Buildings with Aerial Oblique Photography Point Clouds." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-7/W4 (June 26, 2015): 109–12. http://dx.doi.org/10.5194/isprsarchives-xl-7-w4-109-2015.

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Oblique photography technology as an excellent method for 3-D city model construction has brought itself to large-scale recognition and undeniable high social status. Tilt and vertical images with the high overlaps and different visual angles can produce a large number of dense matching point clouds data with spectral information. This paper presents a method of buildings reconstruction with stereo matching dense point clouds from aerial oblique images, which includes segmentation of buildings and reconstruction of building roofs. We summarize the characteristics of stereo matching point clouds from aerial oblique images and outline the problems with existing methods. Then we present the method for segmentation of building roofs, which based on colors and geometrical derivatives such as normal and curvature. Finally, a building reconstruction approach is developed based on the geometrical relationship. The experiment and analysis show that the methods are effective on building reconstruction with stereo matching point clouds from aerial oblique images.

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Su, Wen-June, and Christopher Stohr. "Aerial-photointerpretation of landslides along the Ohio and Mississippi rivers." Environmental and Engineering Geoscience 6, no. 4 (November 1, 2000): 311–23. http://dx.doi.org/10.2113/gseegeosci.6.4.311.

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Abstract A landslide inventory was conducted along the Ohio and Mississippi rivers in the New Madrid Seismic Zone of southern Illinois, between the towns of Olmsted and Chester, Illinois. Aerial photography and field reconnaissance identified 221 landslides of three types: rock/debris falls, block slides, and undifferentiated rotational/translational slides. Most of the landslides are small- to medium-size, ancient rotational/translational features partially obscured by vegetation and modified by weathering. Five imagery sources were interpreted for land-slides: 1:250,000-scale side-looking airborne radar (SLAR); 1:40,000-scale, 1:20,000-scale, 1:6,000-scale, black and white aerial photography; and low altitude, oblique 35-mm color photography. Landslides were identified with three levels of confidence on the basis of distinguishing characteristics and ambiguous indicators. SLAR imagery permitted identification of a 520 hectare mega-landslide which would not have been identified on medium-scale aerial photography. The leaf-off, 35-mm color, oblique photography provided the best imagery for confident interpretation of detailed features needed for smaller landslides.

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Kalaugher, P. G., P. Grainger, and R. L. P. Hodgson. "Cliff stability evaluation using geomorphological maps based on oblique aerial photographs." Geological Society, London, Engineering Geology Special Publications 4, no. 1 (1987): 155–61. http://dx.doi.org/10.1144/gsl.eng.1987.004.01.18.

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AbstractGeomorphological mapping is a well established tool in terrain evaluation. A case record is presented in which high-oblique aerial photography from a light aircraft has been used for basic mapping of a 3 km length of coastline with the purpose of assessing relative landslide hazard.The cliffs at Budleigh Salterton, East Devon, are formed in a succession of Permo-Triassic mudstone, conglomerate and sandstone which dip gently eastwards along the coast. The coastline is divided into five units based on changes in the stratigraphic succession exposed in the cliff face; each unit correlating with distinctive geomorphological features and cliff profiles. Groundwater discharges, wave attack and weathering ensure that there is continuing geomorphological activity. This necessitates frequent updating of local hazard assessment.Overlapping aerial photographs of the cliff face have been taken at intervals during the past six years. With limited ground inspection these photographs provide adequate data for basic geomorphological mapping of the principal forms represented in the cliff. Successive series of photographs are used to follow the development of individual features and to identify the hazards present in each section of the cliff. Data from early Ordnance Survey maps, old photographs and personal reminiscences extend parts of the history of the coast back into the last century. The positions of landslides are controlled largely by geological and hydrological factors whereas the timing of events is often a function of external environmental triggering mechanisms such as weather, tide or waves.A classification of the relative hazard of cliff-top instability has been used to map hazard zones for the coastline. Together with the system of photographic data acquisition advocated, this provides a rapid and economic method to assist planning authorities in determining development strategy.

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Murtiyoso, A., F. Remondino, E. Rupnik, F. Nex, and P. Grussenmeyer. "Oblique Aerial Photography Tool for Building Inspection and Damage Assessment." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-1 (November 7, 2014): 309–13. http://dx.doi.org/10.5194/isprsarchives-xl-1-309-2014.

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Aerial photography has a long history of being employed for mapping purposes due to some of its main advantages, including large area imaging from above and minimization of field work. Since few years multi-camera aerial systems are becoming a practical sensor technology across a growing geospatial market, as complementary to the traditional vertical views. Multi-camera aerial systems capture not only the conventional nadir views, but also tilted images at the same time. In this paper, a particular use of such imagery in the field of building inspection as well as disaster assessment is addressed. The main idea is to inspect a building from four cardinal directions by using monoplotting functionalities. The developed application allows to measure building height and distances and to digitize man-made structures, creating 3D surfaces and building models. The realized GUI is capable of identifying a building from several oblique points of views, as well as calculates the approximate height of buildings, ground distances and basic vectorization. The geometric accuracy of the results remains a function of several parameters, namely image resolution, quality of available parameters (DEM, calibration and orientation values), user expertise and measuring capability.

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Birkbeck, A. E., and G. F. Tomlins. "Aerial Photography for the Detection of Leachate Migration from Landfills." Water Quality Research Journal 20, no. 3 (August 1, 1985): 92–102. http://dx.doi.org/10.2166/wqrj.1985.030.

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Abstract Aerial photography of the perimeters of two landfilled areas in British Columbia was acquired in colour and infrared emulsions. The photography was examined for evidence of leakage, or flooding of the leachate collection ditches surrounding the landfill and vegetation stress caused by the landfilling. At. one site the photography was acquired using a miniature experimental remotely piloted aircraft. This aircraft carries two gimbal-mounted 35 mm cameras which allow simultaneous vertical photography using two different film emulsions, different lenses, and/or filter combinations. At the second landfill site, oblique aerial photography was acquired from a Cessna 172 aircraft. Preliminary interpretation of the photography was followed by visits to locations where possible problems associated with leachate containment were apparent. The results indicated several locations where leachate was not fully contained by the ditch network and some areas of vegetation stress. Further studies at the second site confirmed that improved containment was effective in preventing further environmental damage.

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Remondino, F., I. Toschi, M. Gerke, F. Nex, D. Holland, A. McGill, J. Talaya Lopez, and A. Magarinos. "OBLIQUE AERIAL IMAGERY FOR NMA – SOME BEST PRACTICES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B4 (June 14, 2016): 639–45. http://dx.doi.org/10.5194/isprs-archives-xli-b4-639-2016.

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Oblique airborne photogrammetry is rapidly maturing and being offered by service providers as a good alternative or replacement of the more traditional vertical imagery and for very different applications (Fig.1). EuroSDR, representing European National Mapping Agencies (NMAs) and research organizations of most EU states, is following the development of oblique aerial cameras since 2013, when an ongoing activity was created to continuously update its members on the developments in this technology. Nowadays most European NMAs still rely on the traditional workflow based on vertical photography but changes are slowly taking place also at production level. Some NMAs have already run some tests internally to understand the potential for their needs whereas other agencies are discussing on the future role of this technology and how to possibly adapt their production pipelines. At the same time, some research institutions and academia demonstrated the potentialities of oblique aerial datasets to generate textured 3D city models or large building block models. The paper provides an overview of tests, best practices and considerations coming from the R&D community and from three European NMAs concerning the use of oblique aerial imagery.

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Qiu, Yinguo, Yaqin Jiao, Juhua Luo, Zhenyu Tan, Linsheng Huang, Jinling Zhao, Qitao Xiao, and Hongtao Duan. "A Rapid Water Region Reconstruction Scheme in 3D Watershed Scene Generated by UAV Oblique Photography." Remote Sensing 15, no. 5 (February 22, 2023): 1211. http://dx.doi.org/10.3390/rs15051211.

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Oblique photography technology based on UAV (unmanned aerial vehicle) provides an effective means for the rapid, real-scene 3D reconstruction of geographical objects on a watershed scale. However, existing research cannot achieve the automatic and high-precision reconstruction of water regions due to the sensitivity of water surface patterns to wind and waves, reflections of objects on the shore, etc. To solve this problem, a novel rapid reconstruction scheme for water regions in 3D models of oblique photography is proposed in this paper. It extracts the boundaries of water regions firstly using a designed eight-neighborhood traversal algorithm, and then reconstructs the triangulated irregular network (TIN) of water regions. Afterwards, the corresponding texture images of water regions are intelligently selected and processed using a designed method based on coordinate matching, image stitching and clipping. Finally, the processed texture images are mapped to the obtained TIN, and the real information about water regions can be reconstructed, visualized and integrated into the original real-scene 3D environment. Experimental results have shown that the proposed scheme can rapidly and accurately reconstruct water regions in 3D models of oblique photography. The outcome of this work can refine the current technical system of 3D modeling by UAV oblique photography and expand its application in the construction of twin watershed, twin city, etc.

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Zhou, T., L. Lv, J. Liu, and J. Wan. "APPLICATION OF UAV OBLIQUE PHOTOGRAPHY IN REAL SCENE 3D MODELING." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2021 (June 28, 2021): 413–18. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2021-413-2021.

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Abstract. Aiming at the phenomenon that the traditional measurement methods cannot complete large-scale measurement in a short time, and the image quality obtained by remote sensing in cloudy and rainy areas is difficult to meet the demand, this paper puts forward the idea of using UAV tilt photography to build three-dimensional modeling of urban real scene. The UAV tilt photography technology is used to collect the image data of about 200 km2 in Wuzhishan City. By laying a small number of ground image control points, the aerial triangulation is used to establish the connection, and the three-dimensional modeling of the collected data is carried out. Through the field verification to verify the attribute information of ground objects, the accuracy is verified by using CORS system field coordinate collection. The results show that the ground property and mathematical accuracy of UAV tilt photography model meet the requirements, and can be effectively used in real 3D modeling.

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Zhu, Zan, Jianqi Wang, Yating Zhu, Qiran Chen, and Xinyu Liang. "Systematic Evaluation and Optimization of Unmanned Aerial Vehicle Tilt Photogrammetry Based on Analytic Hierarchy Process." Applied Sciences 12, no. 15 (July 29, 2022): 7665. http://dx.doi.org/10.3390/app12157665.

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In the data acquisition and processing of Unmanned Aerial Vehicle(UAV) oblique photography monomer modeling, it is hard to balance the model quality and the production efficiency. This research applied the Analytic Hierarchy Process (AHP) evaluation method in the field of systems engineering to the management and decision of UAV oblique photography monomer modeling. Firstly, the AHP model is constructed by the expert survey method, and the relative weights of 6 evaluation indicators in the first hierarchies and the comprehensive ones of 3 in the second hierarchies are calculated. Then, each index data of different photo modeling schemes were collected and processed through experiments, and the AHP model was used to systematically evaluate each modeling scheme. Finally, the quadratic function is constructed with two variables, the number of photos and the AHP system score, meanwhile obtaining the optimal scheme by calculation. This is a useful attempt to apply the scientific evaluation method in the field of systems engineering to the production management of UAV aerial surveys. In this way, the efficiency of internal and external data collection and processing can be maximally improved while guaranteeing modeling accuracy.

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Martínez-Carricondo, Patricio, Francisco Agüera-Vega, and Fernando Carvajal-Ramírez. "Use of UAV-Photogrammetry for Quasi-Vertical Wall Surveying." Remote Sensing 12, no. 14 (July 10, 2020): 2221. http://dx.doi.org/10.3390/rs12142221.

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In this study, an analysis of the capabilities of unmanned aerial vehicle (UAV) photogrammetry to obtain point clouds from areas with a near-vertical inclination was carried out. For this purpose, 18 different combinations were proposed, varying the number of ground control points (GCPs), the adequacy (or not) of the distribution of GCPs, and the orientation of the photographs (nadir and oblique). The results have shown that under certain conditions, the accuracy achieved was similar to those obtained by a terrestrial laser scanner (TLS). For this reason, it is necessary to increase the number of GCPs as much as possible in order to cover a whole study area. In the event that this is not possible, the inclusion of oblique photography ostensibly improves results; therefore, it is always advisable since they also improve the geometric descriptions of break lines or sudden changes in slope. In this sense, UAVs seem to be a more economic substitute compared to TLS for vertical wall surveying.

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Che, Defu, Kai He, Kehan Qiu, Yining Liu, Baodong Ma, and Quan Liu. "Edge Restoration of a 3D Building Model Based on Oblique Photography." Applied Sciences 12, no. 24 (December 15, 2022): 12911. http://dx.doi.org/10.3390/app122412911.

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Unmanned aerial vehicle (UAV) oblique photography technology is widely used in a variety of fields because of its excellent efficiency, realism, and low cost of manufacturing. However, due to the influence of lighting, occlusion, weak textures, and other factors in aerial images, the modeling results can have the problem of an incorrect structure that is inconsistent with the real scene. The edge line of a building is the main external expression of its structure. Whether the edge line is straight or not will directly affect the realism of the building, so the restoration of the edge line can improve the realism of the building. In this study, we proposed and developed a method for the restoration of the edge line of a 3D building model based on triangular mesh cutting. Firstly, the feature line of the edge line was drawn using human–computer interaction, and axis-aligned bounding box (AABB) collision detection was carried out around the feature line to determine the triangular patches to be cut. Then, the triangular cutting algorithm was used to cut the triangular patches projected onto the plane. Finally, the structure and texture of the 3D building model were reconstructed. This method allowed us to actualize the physical separation of continuous triangulation; the triangulation around the edge line was cut, and the plane was fitted. This method was able to improve cutting accuracy and edge flatness and enhance the edge features of buildings and the rendering quality of models. The experimental results showed that the edge restoration method proposed in this paper is reliable and that it can effectively improve the building rendering effect of a 3D building model based on UAV oblique photography and can also enhance the realism of the model.

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Gao, W., G. Wang, H. Li, W. Mao, S. Yin, and B. Yao. "RESEARCH ON THE KEY TECHNOLOGY OF UAV IN THE ACCURACY ASSESSMENT OF LAND COVER CLASSIFICATION." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2022 (May 31, 2022): 1203–8. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2022-1203-2022.

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Abstract. This paper uses UAV low-altitude aerial photography technology, equipped with orthophoto camera, tilt camera and LiDAR camera, to obtain and process high-precision evaluation data, which is used to evaluate the correctness of land cover classification. Through the design of aerial photography scheme and data collection and processing, the rapidly acquired digital orthophoto, oblique 3D model data and laser LiDAR form a complete set of technical processes, which can relatively accurately and objectively monitor the quality of surface data for the existing geographical conditions. situation is assessed. The main purpose of this study is to further enrich the technical means of quality inspection of surveying and mapping products, to improve the technical level of quality inspection and acceptance of geographic condition monitoring data, and to improve the accuracy and reliability of data quality evaluation.

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Jun, Cai, Chen Jie, Li Jing, and He Peng. "Research on Oblique Aerial Photography and its Application in Detection of Hidden Geological Hazards." IOP Conference Series: Earth and Environmental Science 783, no. 1 (May 1, 2021): 012124. http://dx.doi.org/10.1088/1755-1315/783/1/012124.

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CURRAN, P. J. "Small format, oblique, colour aerial photography: an aid to the location of methane seepage." International Journal of Remote Sensing 7, no. 4 (April 1986): 477–79. http://dx.doi.org/10.1080/01431168608954703.

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Hou, Jian-hua, Jian-ying Wang, Xue-xin Ma, and Dan Liang. "Estimation of Volume of Felled Chinese Fir Trees Using Unmanned Aerial Vehicle Oblique Photography." Sensors and Materials 34, no. 11 (November 16, 2022): 3989. http://dx.doi.org/10.18494/sam3996.

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LITVINOV, Denis V. "MODERN METHODS OF AERIAL PHOTOGRAPHY FOR ARCHITECTURAL AND PLANNING ANALYSIS OF CULTURAL HERITAGE OBJECTS." Urban construction and architecture 7, no. 4 (December 15, 2017): 110–14. http://dx.doi.org/10.17673/vestnik.2017.04.19.

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In the article the results of research works of a large-scale object of cultural heritage of the Earth mound of the Krasnoyarsk fortress with application of aerial photography from the unmanned aerial vehicle are presented. The Krasnoyarsk fortress is a unique monument of military fortifi cation architecture of Russia of the fi rst half of the XVIII century and one of the largest defensive lines in Russia, created for protection of the southeastern edge of the European Russia against att acks of nomads. The results of vertical and oblique aerial photography allow to reveal the general architectural and planning composition of the Earth mound of fortress as well as to see all the area of a complex and to defi ne the territorial unity with other fortifi cation constructions. The methods of use of unmanned aerial vehicles give materials about the object in study and allow to bind its spatial location to the coordinate system of the terrain, to create three-dimensional model of the area, to compare the received images with the available historical cards and plans, which will signifi cantly facilitate the task of registering the Fortress with the security authorities and withdrawing its territory from economic use.

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He, Yanjun, Shuzhao Chen, Bin Zhang, and Kai Chen. "Multimedia Tilt Photography-Assisted Remote Sensing Technology in Mine Ecological Restoration." Computational Intelligence and Neuroscience 2022 (June 10, 2022): 1–5. http://dx.doi.org/10.1155/2022/1442738.

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Ecological restoration with the assistance of certain artificial measures is to restore the original ecological function and productivity of the ecosystem or to make the ecosystem develop to a virtuous circle, which is a complex systematic project. Based on this, combined with the actual needs of a mine ecological restoration project, this paper puts forward the technical process and method of quickly acquiring the geographic information of abandoned mines by using the oblique photography technology of unmanned aerial vehicles. The verification results show that the maximum plane/elevation residual error of the checkpoints measured in the field is 0.221 m−0.181 m, and the median error is 0.030 m–0.112 m. According to the encryption requirement of 1∶500 scale topographic mapping in hilly land, the plane position error of the inspection point relative to the field control point should be less than 0.175 m. The elevation should be less than 0.280 m, and the experimental results in this paper can meet the requirements. Oblique photography can provide abundant digital results, and it can play an important role in mine restoration scheme design, restoration construction, and monitoring and management after restoration.

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Lin, Jiayuan, Meimei Wang, Mingguo Ma, and Yi Lin. "Aboveground Tree Biomass Estimation of Sparse Subalpine Coniferous Forest with UAV Oblique Photography." Remote Sensing 10, no. 11 (November 21, 2018): 1849. http://dx.doi.org/10.3390/rs10111849.

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In tree Aboveground Biomass (AGB) estimation, the traditional harvest method is accurate but unsuitable for a large-scale forest. The airborne Light Detection And Ranging (LiDAR) is superior in obtaining the point cloud data of a dense forest and extracting tree heights for AGB estimation. However, the LiDAR has limitations such as high cost, low efficiency, and complicated operations. Alternatively, the overlapping oblique photographs taken by an Unmanned Aerial Vehicle (UAV)-loaded digital camera can also generate point cloud data using the Aerial Triangulation (AT) method. However, limited by the relatively poor penetrating capacity of natural light, the photographs captured by the digital camera on a UAV are more suitable for obtaining the point cloud data of a relatively sparse forest. In this paper, an electric fixed-wing UAV loaded with a digital camera was employed to take oblique photographs of a sparse subalpine coniferous forest in the source region of the Minjiang River. Based on point cloud data obtained from the overlapping photographs, a Digital Terrain Model (DTM) was generated by filtering non-ground points along with the acquisition of a Digital Surface Model (DSM) of Minjiang fir trees by eliminating subalpine shrubs and meadows. Individual tree heights were extracted by overlaying individual tree outlines on Canopy Height Model (CHM) data computed by subtracting the Digital Elevation Model (DEM) from the rasterized DSM. The allometric equation with tree height (H) as the predictor variable was established by fitting measured tree heights with tree AGBs, which were estimated using the allometric equation on H and Diameter at Breast Height (DBH) in sample tree plots. Finally, the AGBs of all of the trees in the test site were determined by inputting extracted individual tree heights into the established allometric equation. In accuracy assessment, the coefficient of determination (R2) and Root Mean Square Error (RMSE) of extracted individual tree heights were 0.92 and 1.77 m, and the R2 and RMSE of the estimated AGBs of individual trees were 0.96 and 54.90 kg. The results demonstrated the feasibility and effectiveness of applying UAV-acquired oblique optical photographs to the tree AGB estimation of sparse subalpine coniferous forests.

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Behrman, Caroline, Roy Van Arsdale, Youngsang Kwon, Kerry Stockslager, Dave Leverett, and David Lumsden. "Drone Geologic Mapping of an Active Sand and Gravel Quarry, Desoto County, Mississippi." Drones 3, no. 3 (July 15, 2019): 57. http://dx.doi.org/10.3390/drones3030057.

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Aerial drone photography of an active pit within a sand and gravel quarry in DeSoto County, Mississippi, was conducted to better understand the Upland Complex, which is a high-level Pliocene terrace of the Mississippi River. The Upland Complex is of great interest economically, as it is the primary source of sand and gravel for Memphis, Tennessee and the surrounding region. The pit dimensions were approximately 820 ft (250 m) by 655 ft (200 m) and 79-ft (24 m) deep upon completion of the mining. Eight 3-D models of the pit were made at different times to illustrate the mining progression. Oblique and horizontal stereo aerial photography of the highwalls was conducted to produce 3-D models and high-resolution photomosaics of the highwalls for geologic mapping and interpretation. The mapped highwall geology included Pliocene Mississippi River bars consisting of sand, sand and gravel, and gravel ranging in thickness from 2 ft (0.6 m) to 32.8 ft (10 m), with variable cross-bed dip directions suggesting a meandering river environment of deposition. Pleistocene loess overlies the Pliocene sediment. The highwalls also revealed northerly-striking late Pliocene or Pleistocene tectonic folding, faulting, and probable earthquake liquefaction in northwestern Mississippi, where no Pliocene or Quaternary tectonic deformation had previously been reported. This study demonstrated Drone aerial photography as a quick, low cost, and safe means to study poorly accessible open-pit mining and to help understand the geology of the lower Mississippi River Valley.

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Warner, William S., Sjur Andersen, and Steiner Saeland. "Surveying a Waste Site with 35-mm Oblique Aerial Photography: Monoplotting with a Digitizing Tablet." Cartography and Geographic Information Systems 20, no. 4 (January 1993): 237–43. http://dx.doi.org/10.1559/152304093782637505.

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Gardner, Charlie J., Xavier Vincke, Simon Rafanomezantsoa, and Malika Virah-Sawmy. "Oblique aerial photography: a novel tool for the monitoring and participatory management of protected areas." PARKS 21, no. 1 (March 27, 2015): 13–28. http://dx.doi.org/10.2305/iucn.ch.2014.parks-21-1cjg.en.

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Li, Jinhan, Lihai Liu, and Ke Guan. "Narrow-Band Radio Propagation Prediction Based on a Highly Accurate Three-Dimensional Railway Environment Model." Wireless Communications and Mobile Computing 2022 (March 18, 2022): 1–14. http://dx.doi.org/10.1155/2022/3341316.

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In this paper, radio propagation predictions were performed by a self-developed ray tracing simulator based on highly accurate three-dimensional (3D) environment models obtained by oblique aerial photography (OAP). In order to support ray tracing computations, the highly complex environment models were managed by three steps, including model separation, electromagnetic parameter assignment, and model lightweighting. Simulations and real-world experiments were conducted to test the proposed method. The results show that the root mean square errors (RMSE) in the predicted received signal strength curves were achieved 4 dB with comparably low computational complexity in the selected railway scenarios.

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Xu, Zhen, Yuan Wu, Xinzheng Lu, and Xinlei Jin. "Photo-realistic visualization of seismic dynamic responses of urban building clusters based on oblique aerial photography." Advanced Engineering Informatics 43 (January 2020): 101025. http://dx.doi.org/10.1016/j.aei.2019.101025.

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He, Shaohua, Xiaochun Guo, Jianyan He, Bo Guo, and Cheng Zheng. "Investigation of Measurement Accuracy of Bridge Deformation Using UAV-Based Oblique Photography Technique." Sensors 22, no. 18 (September 9, 2022): 6822. http://dx.doi.org/10.3390/s22186822.

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This paper investigates the measurement accuracy of unmanned aerial vehicle-based oblique photography (UAVOP) in bridge deformation identifications. A simply supported concrete beam model was selected and measured using the UAVOP technique. The influences of several parameters, such as overall flight altitude (h), local shooting distance (d), partial image overlap (λ), and arrangement of control points, on the quality of the reconstructed three-dimensional (3D) beam model, were presented and discussed. Experimental results indicated that the quality of the reconstructed 3D model was significantly improved by the fusion overall-partial flight routes (FR), of which the reconstructed model quality was 46.7% higher than those with the single flight route (SR). Despite the minimal impact of overall flight altitude, the reconstructed model quality prominently varied with the local shooting distance, partial image overlap, and control points arrangement. As the d decreased from 12 m to 8 m, the model quality was improved by 48.2%, and an improvement of 42.5% was also achieved by increasing the λ from 70% to 80%. The reconstructed model quality of UAVOP with the global-plane control points was 78.4% and 38.4%, respectively, higher than those with the linear and regional control points. Furthermore, an optimized scheme of UAVOP with control points in global-plane arrangement and FR (h = 50 m, d = 8 m, and λ = 80%) was recommended. A comparison between the results measured by the UAVOP and the total station showed maximum identification errors of 1.3 mm. The study’s outcomes are expected to serve as potential references for future applications of UAVOP in bridge measurements.

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Zhang, Xuehua, and Duo Deng. "Research on Disaster Acquisition Method Based on Point and Surface Combination of UAV Technology." IOP Conference Series: Earth and Environmental Science 1004, no. 1 (March 1, 2022): 012025. http://dx.doi.org/10.1088/1755-1315/1004/1/012025.

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Abstract UAV (Unmanned Aerial Vehicle) remote sensing technology plays an increasingly important role in disaster acquisition. At present, after the disaster occurs, the orthophoto images of the UAV in the disaster area can be quickly obtained, but the bidimensionality of the orthophoto image limits the accuracy of disaster information extraction; it is required to improve the timeliness of the large-area 3D model established using the oblique photography technology in the disaster area. Combining the advantages of orthophoto and 3D models, this paper proposes a method for rapid acquisition of disasters based on point-surface combination. The Tibet Milin M6.9 earthquake is used as an example to analyze the advantages and disadvantages of this method in practical applications.

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Ye, Q., X. Zhang, Y. Lin, and J. Jian. "ACCURACY ANALYSIS OF REAL-TIME OBJECT POSITIONING WITHOUT GCP FOR IMAGES FROM UAV OBLIQUE ULTRA-LONG FOCAL SMALL VIEW FIELD WHISKBROOM CAMERA SYSTEM." International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B1-2022 (May 30, 2022): 325–32. http://dx.doi.org/10.5194/isprs-archives-xliii-b1-2022-325-2022.

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Abstract. Using images from UAV oblique ultra-long focal small view field whiskbroom camera (ULF-SVF-WC) system for object positioning and mapping is more difficult than conventional aerial photogrammetry, for the particularity of oblique ULF-SVF-WC imaging mode. Therefore, the precision and accuracy of its object positioning are also quite different from that of the conventional UAV photography. In this paper, we analysed the accuracy of real-time object positioning without ground control points (GCPs) for images from UAV oblique ULF-SVF-WC System. Firstly, we studied the imaging principles and characteristics of the oblique ULF-SVF-WC system. Then, we established the coordinate transformation relationship from the object point to the image point and constructed a strict imaging model for oblique ULF-SVF-WC image, which was used for real-time single-ray back-projection positioning assisted by DEM. Thirdly, we quantitatively analysed the distribution and variation of the oblique ULF-SVF-WC image single-ray back-projection errors in theory based on error propagation law and simulation data. Finally, we conducted the experiment of real oblique ULF-SVF-WC flight images for the actual positioning accuracy analysis. The experiment results showed that: the influence of system error on positioning generally conforms to the distribution and variation of theoretical precision, that is, the accuracy of scanning direction is much lower than that of the flight direction; while the accuracy of actual single-ray back-projection positioning is evidently lower than that of the theoretical analysis and there are obvious system errors in the positioning residuals. It indicates that the 6 external orientation elements calculated from POS data contains obvious system error whose influence is greater than random error and this should be eliminated in real-time single-ray back-projection for object positioning.

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Chen, Jundong, and Jun Sasaki. "Mapping of Subtidal and Intertidal Seagrass Meadows via Application of the Feature Pyramid Network to Unmanned Aerial Vehicle Orthophotos." Remote Sensing 13, no. 23 (December 1, 2021): 4880. http://dx.doi.org/10.3390/rs13234880.

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Seagrass meadows are one of the blue carbon ecosystems that continue to decline worldwide. Frequent mapping is essential to monitor seagrass meadows for understanding change processes including seasonal variations and influences of meteorological and oceanic events such as typhoons and cyclones. Such mapping approaches may also enhance seagrass blue carbon strategy and management practices. Although unmanned aerial vehicle (UAV) aerial photography has been widely conducted for this purpose, there have been challenges in mapping accuracy, efficiency, and applicability to subtidal water meadows. In this study, a novel method was developed for mapping subtidal and intertidal seagrass meadows to overcome such challenges. Ground truth seagrass orthophotos in four seasons were created from the Futtsu tidal flat of Tokyo Bay, Japan, using vertical and oblique UAV photography. The feature pyramid network (FPN) was first applied for automated seagrass classification by adjusting the spatial resolution and normalization parameters and by considering the combinations of seasonal input data sets. The FPN classification results ensured high performance with the validation metrics of 0.957 overall accuracy (OA), 0.895 precision, 0.942 recall, 0.918 F1-score, and 0.848 IoU, which outperformed the conventional U-Net results. The FPN classification results highlighted seasonal variations in seagrass meadows, exhibiting an extension from winter to summer and demonstrating a decline from summer to autumn. Recovery of the meadows was also detected after the occurrence of Typhoon No. 19 in October 2019, a phenomenon which mainly happened before summer 2020.

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Zhang, Rui, Heng Li, Kaifeng Duan, Shucheng You, Ke Liu, Futao Wang, and Yong Hu. "Automatic Detection of Earthquake-Damaged Buildings by Integrating UAV Oblique Photography and Infrared Thermal Imaging." Remote Sensing 12, no. 16 (August 13, 2020): 2621. http://dx.doi.org/10.3390/rs12162621.

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Extracting damage information of buildings after an earthquake is crucial for emergency rescue and loss assessment. Low-altitude remote sensing by unmanned aerial vehicles (UAVs) for emergency rescue has unique advantages. In this study, we establish a remote sensing information-extraction method that combines ultramicro oblique UAV and infrared thermal imaging technology to automatically detect the structural damage of buildings and cracks in external walls. The method consists of four parts: (1) 3D live-action modeling and building structure analysis based on ultramicro oblique images; (2) extraction of damage information of buildings; (3) detection of cracks in walls based on infrared thermal imaging; and (4) integration of detection systems for information of earthquake-damaged buildings. First, a 3D live-action building model is constructed. A multi-view structure image for segmentation can be obtained based on this method. Second, a method of extracting information on damage to building structures using a 3D live-action building model as the geographic reference is proposed. Damage information of the internal structure of the building can be obtained based on this method. Third, based on analyzing the temperature field distribution on the exterior walls of earthquake-damaged buildings, an automatic method of detecting cracks in the walls by using infrared thermal imaging is proposed. Finally, the damage information detection and assessment system is researched and developed, and the system is integrated. Taking earthquake search-and-rescue simulation as an example, the effectiveness of this method is verified. The damage distribution in the internal structure and external walls of buildings in this area is obtained with an accuracy of 78%.

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Wang, Dejiang, and Huazhen Shu. "Accuracy Analysis of Three-Dimensional Modeling of a Multi-Level UAV without Control Points." Buildings 12, no. 5 (May 3, 2022): 592. http://dx.doi.org/10.3390/buildings12050592.

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Unmanned Aerial Vehicle (UAV) oblique photography technology has been applied more and more widely for the 3D reconstruction of real-scene models due to its high efficiency and low cost. However, there are many kinds of UAVs with different positioning methods, camera models, and resolutions. To evaluate the performance levels of different types of UAVs in terms of their application to 3D reconstruction, this study took a primary school as the research area and obtained image information through oblique photography of four UAVs of different levels at different flight altitudes. We then conducted a comparative analysis of the accuracy of their 3D reconstruction models. The results show that the 3D reconstruction model of M300RTK has the highest dimensional accuracy, with an error of about 1.1–1.4 m per kilometer, followed by M600Pro (1.5–3.6 m), Inspire2 (1.8–4.2 m), and Phantom4Pro (2.4–5.6 m), but the accuracy of the 3D reconstruction model was found to have no relationship with the flight altitude. At the same time, the resolution of the 3D reconstruction model improved as the flight altitude decreased and the image resolution of the PTZ camera increased. The 3D reconstruction model resolution of the M300RTK + P1 camera was the highest. For every 10 m decrease in flight altitude, the clarity of the 3D reconstruction model improved by 16.81%. The UAV flight time decreased as the UAV flying altitude increased, and the time required for 3D reconstruction of the model increased obviously as the number and resolution of photos increased.

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Bureau, Pierre. "Aerial Low-Altitude Photography: A Tool for Field Surveys. La Photographie Aerienne Oblique: Une Technique Nouvelle de Perception et de Sauvegarde des Cultures Anciennes." APT Bulletin 22, no. 1/2 (1990): 85. http://dx.doi.org/10.2307/1504275.

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Zhang, Han, Yucong Yao, Ke Xie, Chi-Wing Fu, Hao Zhang, and Hui Huang. "Continuous aerial path planning for 3D urban scene reconstruction." ACM Transactions on Graphics 40, no. 6 (December 2021): 1–15. http://dx.doi.org/10.1145/3478513.3480483.

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We introduce the first path-oriented drone trajectory planning algorithm, which performs continuous (i.e., dense ) image acquisition along an aerial path and explicitly factors path quality into an optimization along with scene reconstruction quality. Specifically, our method takes as input a rough 3D scene proxy and produces a drone trajectory and image capturing setup, which efficiently yields a high-quality reconstruction of the 3D scene based on three optimization objectives: one to maximize the amount of 3D scene information that can be acquired along the entirety of the trajectory, another to optimize the scene capturing efficiency by maximizing the scene information that can be acquired per unit length along the aerial path, and the last one to minimize the total turning angles along the aerial path, so as to reduce the number of sharp turns. Our search scheme is based on the rapidly-exploring random tree framework, resulting in a final trajectory as a single path through the search tree. Unlike state-of-the-art works, our joint optimization for view selection and path planning is performed in a single step. We comprehensively evaluate our method not only on benchmark virtual datasets as in existing works but also on several large-scale real urban scenes. We demonstrate that the continuous paths optimized by our method can effectively reduce onsite acquisition cost using drones, while achieving high-fidelity 3D reconstruction, compared to existing planning methods and oblique photography, a mature and popular industry solution.

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Kang, C. L., Y. Cheng, F. Wang, M. M. Zong, J. Luo, and J. Y. Lei. "THE APPLICATION OF UAV OBLIQUE PHOTOGRAMMETRY IN SMART TOURISM: A CASE STUDY OF LONGJI TERRACED SCENIC SPOT IN GUANGXI PROVINCE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3/W10 (February 7, 2020): 575–80. http://dx.doi.org/10.5194/isprs-archives-xlii-3-w10-575-2020.

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Abstract. With the application of UAV Oblique photography, rapid 3D real-time modeling based on aerial image data has become a new technology in the field of 3D modeling. In view of the current poor mapping and inability to reuse the basic surveying and mapping data in the publicity and display, dynamic planning, etc., based on the UAV photogrammetry technology that is used to rapidly and accurately collect image data of the Longji terraced scenic spot in Guilin, Guangxi, this paper develops a platform by 3D real-time modeling technology with the combination of the high-tech such as digital mapping to realize the three-dimensional navigation and smart tourism of the scenic spot. The practical results show that the application can better meet the actual needs of high precision, large scale, wide audience, strong interaction, etc., which effectively alleviates the contradiction between the protection and utilization of cultural resources in cultural tourism, expands the cultural resources audience, and provides high-tech support to the cultural tourism.

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Khun, Kosal, Nicolas Tremblay, Bernard Panneton, Philippe Vigneault, Etienne Lord, François Cavayas, and Claude Codjia. "Use of Oblique RGB Imagery and Apparent Surface Area of Plants for Early Estimation of Above-Ground Corn Biomass." Remote Sensing 13, no. 20 (October 9, 2021): 4032. http://dx.doi.org/10.3390/rs13204032.

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Estimating above-ground biomass in the context of fertilization management requires the monitoring of crops at early stages. Conventional remote sensing techniques make use of vegetation indices such as the normalized difference vegetation index (NDVI), but they do not exploit the high spatial resolution (ground sampling distance < 5 mm) now achievable with the introduction of unmanned aerial vehicles (UAVs) in agriculture. The aim of this study was to compare image mosaics to single images for the estimation of corn biomass and the influence of viewing angles in this estimation. Nadir imagery was captured by a high spatial resolution camera mounted on a UAV to generate orthomosaics of corn plots at different growth stages (from V2 to V7). Nadir and oblique images (30° and 45° with respect to the vertical) were also acquired from a zip line platform and processed as single images. Image segmentation was performed using the difference color index Excess Green-Excess Red, allowing for the discrimination between vegetation and background pixels. The apparent surface area of plants was then extracted and compared to biomass measured in situ. An asymptotic total least squares regression was performed and showed a strong relationship between the apparent surface area of plants and both dry and fresh biomass. Mosaics tended to underestimate the apparent surface area in comparison to single images because of radiometric degradation. It is therefore conceivable to process only single images instead of investing time and effort in acquiring and processing data for orthomosaic generation. When comparing oblique photography, an angle of 30° yielded the best results in estimating corn biomass, with a low residual standard error of orthogonal distance (RSEOD = 0.031 for fresh biomass, RSEOD = 0.034 for dry biomass). Since oblique imagery provides more flexibility in data acquisition with fewer constraints on logistics, this approach might be an efficient way to monitor crop biomass at early stages.

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Gominski, Dimitri, Valérie Gouet-Brunet, and Liming Chen. "Connecting Images through Sources: Exploring Low-Data, Heterogeneous Instance Retrieval." Remote Sensing 13, no. 16 (August 5, 2021): 3080. http://dx.doi.org/10.3390/rs13163080.

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Along with a new volume of images containing valuable information about our past, the digitization of historical territorial imagery has brought the challenge of understanding and interconnecting collections with unique or rare representation characteristics, and sparse metadata. Content-based image retrieval offers a promising solution in this context, by building links in the data without relying on human supervision. However, while the latest propositions in deep learning have shown impressive results in applications linked to feature learning, they often rely on the hypothesis that there exists a training dataset matching the use case. Increasing generalization and robustness to variations remains an open challenge, poorly understood in the context of real-world applications. Introducing the alegoria benchmark, containing multi-date vertical and oblique aerial digitized photography mixed with more modern street-level pictures, we formulate the problem of low-data, heterogeneous image retrieval, and propose associated evaluation setups and measures. We propose a review of ideas and methods to tackle this problem, extensively compare state-of-the-art descriptors and propose a new multi-descriptor diffusion method to exploit their comparative strengths. Our experiments highlight the benefits of combining descriptors and the compromise between absolute and cross-domain performance.

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Simion, Sorina Dora. "La exposición de arte visual novelada por Enrique Vila-Matas." Studia Universitatis Babeș-Bolyai Philologia 66, no. 4 (December 17, 2021): 223–38. http://dx.doi.org/10.24193/subbphilo.2021.4.15.

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The Art Exhibition as a Novel by Enrique Vila-Matas. I set out to analyze, using the New Rhetoric methods, the book entitled Cabinet d`amateur, an oblique novel published by the contemporary Spanish writer Enrique Vila-Matas in 2019, at the same time as the opening of an exhibition whose curator he was in the Whitechapel Gallery in east London. Choosing the six visual art works, different in nature, concept, and aesthetics, from the collection of the “laCaixa” Foundation represents an occasion for the writer, led by curiosity, to investigate the works of art and to make a personal, purely subjective selection, on which he reflects in his heterogenic work as a genre: the catalogue of an exhibition, memoirs, essay (auto)biography, the skeleton of an oblique novel of the future. The selected works of art (I.G., the mysterious portrait of a woman by the painter Gerhard Richter; an installation, Petite, by Dominique Gonzalez-Foerster; a videoclip, La lección respiratoria, belonging to the artist Dora García; Milonga, Carlos Pazos’s self-portrait; a detailed scenery, Une poignée de terre, by Miquel Barceló and a photography of Theban by Andreas Gursky, in an overlap of an aerial view with one detailed figure) are included in the text as a starting point for meditations and reflections upon the nature of the art in general, because the metaphor of the literary work, the novel of the future, is precisely the building of Rem Koolhass, the library in Seattle, in which different styles overlap and whose shapes are imprecise, undetermined, incongruent, disharmonic and lacking in logic. Literature, visual arts, music, and architecture are associated, and different figures are used to point out the aesthetic of the negative and the idea that form and content are interchangeable. Keywords: Enrique Vila-Matas, Cabinet d´amateur, an oblique novel, general-rhetoric analysis, the exhibition as a novel, literary biography

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Qin, Longjun, Peng Mao, Zhenbang Xu, Yang He, Chunhua Yan, Muhammad Hayat, and Guo-Yu Qiu. "Accurate Measurement and Assessment of Typhoon-Related Damage to Roadside Trees and Urban Forests Using the Unmanned Aerial Vehicle." Remote Sensing 14, no. 9 (April 27, 2022): 2093. http://dx.doi.org/10.3390/rs14092093.

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With drastic changes to the environment arising from global warming, there has been an increase in both the frequency and intensity of typhoons in recent years. Super typhoons have caused large-scale damage to the natural ecological environment in coastal cities. The accurate assessment and monitoring of urban vegetation damage after typhoons is important, as they contribute to post-disaster recovery and resilience efforts. Hence, this study examined the application of the easy-to-use and cost-effective Unmanned Aerial Vehicle (UAV) oblique photography technology and proposed an improved detection and diagnostic measure for the assessment of street-level damage to urban vegetation caused by the super typhoon Mangkhut in Shenzhen, China. The results showed that: (1) roadside trees and artificially landscaped forests were severely damaged; however, the naturally occurring urban forest was less affected by the typhoon. (2) The vegetation height of roadside trees decreased by 20–30 m in most areas, and that of artificially landscaped forests decreased by 5–15 m; however, vegetation height in natural forest areas did not change significantly. (3) The real damage to vegetation caused by the typhoon is better reflected by measuring the change in vegetation height. Our study validates the use of UAV remote sensing to accurately measure and assess the damage caused by typhoons to roadside trees and urban forests. These findings will help city planners to design more robust urban landscapes that have greater disaster coping capabilities.

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Locke, Chris, Mark White, Jacqueline Michel, Charlie Henry, Jon D. Sellars, and Micheal L. Aslaksen. "USE OF VERTICAL DIGITAL PHOTOGRAPHY AT THE BAYOU PEROT, LA SPILL FOR OIL MAPPING AND VOLUME ESTIMATION." International Oil Spill Conference Proceedings 2008, no. 1 (May 1, 2008): 127–30. http://dx.doi.org/10.7901/2169-3358-2008-1-127.

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ABSTRACT The January 2007 release of over 8,000 barrels of a condensate crude oil from a damaged well in Bayou Perot, Louisiana resulted in intermittent oiling of remote mud flats and salt marshes over a 30 square mile area. NOAA'S National Geodetic Survey collected aerial vertical digital photography 17 days after the spill to assist in locating and quantifying areas of oiling. The effective pixel size was 34 centimeters, however, the data were processed to 40 centimeter resolution. Useful products were posted to the web within two days after acquisition. Standard supervised and unsupervised image processing techniques were used in conjunction with oblique photography and field knowledge to define the oiling signatures. Time constraints required that the classification be conducted on mosaiced, non-color balanced images (ideally each image would be classified independently to account for differences in illumination and/or processing). However, the strong visible signature of the oiled areas and ground-truth data from field surveys resulted in high confidence levels for several oil types which in turn were used to enhance the identification of the remaining classes. Five oil types were identified: Black (218,000 ft2), Red (81,000 ft2), Orange (154,000 ft2), Yellow (38,000 ft2), and Light Yellow (349,000 ft2) corresponding to the color and attributes of the oil. The total conservative estimate of oiled area was 840,000 ft2 or nearly 20 acres. Based on estimated thicknesses of the different oils, the total volume of oil present at the time of imagery acquisition was 3,330 barrels. This value was close to the actual amount of oil recovered over the time period between the date of imagery acquisition and the end of cleanup.

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Zhang, Yuxin, Lei Zhang, Guochen Shen, and Qian Xu. "Physical Structure Expression for Dense Point Clouds of Magnetic Levitation Image Data." Sensors 23, no. 5 (February 24, 2023): 2535. http://dx.doi.org/10.3390/s23052535.

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The research and development of an intelligent magnetic levitation transportation system has become an important research branch of the current intelligent transportation system (ITS), which can provide technical support for state-of-the-art fields such as intelligent magnetic levitation digital twin. First, we applied unmanned aerial vehicle oblique photography technology to acquire the magnetic levitation track image data and preprocessed them. Then, we extracted the image features and matched them based on the incremental structure from motion (SFM) algorithm, recovered the camera pose parameters of the image data and the 3D scene structure information of key points, and optimized the bundle adjustment to output 3D magnetic levitation sparse point clouds. Then, we applied multiview stereo (MVS) vision technology to estimate the depth map and normal map information. Finally, we extracted the output of the dense point clouds that can precisely express the physical structure of the magnetic levitation track, such as turnout, turning, linear structures, etc. By comparing the dense point clouds model with the traditional building information model, experiments verified that the magnetic levitation image 3D reconstruction system based on the incremental SFM and MVS algorithm has strong robustness and accuracy and can express a variety of physical structures of magnetic levitation track with high accuracy.

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Yin, Sen-Lin, You-xin Wu, Bai-yu Zhu, Le-Li Cheng, Jun-Wei Zhao, and Wei-Chang Chen. "3-D tight sandstone gas outcrop simulation based on unmanned aerial vehicle oblique photography data— A case study from the Pingtouxiang outcrop in North Shanxi, China." Unconventional Resources 3 (2023): 93–102. http://dx.doi.org/10.1016/j.uncres.2023.01.001.

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Nakada, Ryuji, Masanori Takigawa, Tomowo Ohga, and Noritsuna Fujii. "VERIFICATION OF POTENCY OF AERIAL DIGITAL OBLIQUE CAMERAS FOR AERIAL PHOTOGRAMMETRY IN JAPAN." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 2, 2016): 63–68. http://dx.doi.org/10.5194/isprs-archives-xli-b1-63-2016.

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Digital oblique aerial camera (hereinafter called “oblique cameras”) is an assembly of medium format digital cameras capable of shooting digital aerial photographs in five directions i.e. nadir view and oblique views (forward and backward, left and right views) simultaneously and it is used for shooting digital aerial photographs efficiently for generating 3D models in a wide area. For aerial photogrammetry of public survey in Japan, it is required to use large format cameras, like DMC and UltraCam series, to ensure aerial photogrammetric accuracy. Although oblique cameras are intended to generate 3D models, digital aerial photographs in 5 directions taken with them should not be limited to 3D model production but they may also be allowed for digital mapping and photomaps of required public survey accuracy in Japan. In order to verify the potency of using oblique cameras for aerial photogrammetry (simultaneous adjustment, digital mapping and photomaps), (1) a viewer was developed to interpret digital aerial photographs taken with oblique cameras, (2) digital aerial photographs were shot with an oblique camera owned by us, a Penta DigiCAM of IGI mbH, and (3) accuracy of 3D measurements was verified.

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Nakada, Ryuji, Masanori Takigawa, Tomowo Ohga, and Noritsuna Fujii. "VERIFICATION OF POTENCY OF AERIAL DIGITAL OBLIQUE CAMERAS FOR AERIAL PHOTOGRAMMETRY IN JAPAN." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B1 (June 2, 2016): 63–68. http://dx.doi.org/10.5194/isprsarchives-xli-b1-63-2016.

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Digital oblique aerial camera (hereinafter called “oblique cameras”) is an assembly of medium format digital cameras capable of shooting digital aerial photographs in five directions i.e. nadir view and oblique views (forward and backward, left and right views) simultaneously and it is used for shooting digital aerial photographs efficiently for generating 3D models in a wide area. For aerial photogrammetry of public survey in Japan, it is required to use large format cameras, like DMC and UltraCam series, to ensure aerial photogrammetric accuracy. Although oblique cameras are intended to generate 3D models, digital aerial photographs in 5 directions taken with them should not be limited to 3D model production but they may also be allowed for digital mapping and photomaps of required public survey accuracy in Japan. In order to verify the potency of using oblique cameras for aerial photogrammetry (simultaneous adjustment, digital mapping and photomaps), (1) a viewer was developed to interpret digital aerial photographs taken with oblique cameras, (2) digital aerial photographs were shot with an oblique camera owned by us, a Penta DigiCAM of IGI mbH, and (3) accuracy of 3D measurements was verified.

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張慕恩, 張慕恩, 王常暢 Mu-En Chang, 張雯珺 Chang-Chang Wang, and 溫采穎 Wen-Jun Zhang. "都市3D熱環境模型的建立—以無人機傾斜攝影測量法建構." 建築學報 115, no. 115-1 (March 2021): 037–51. http://dx.doi.org/10.53106/101632122021030115009.

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對於都市規劃來說，如何迅速且動態地評估環境以最小化熱衝擊及都市內部的能源消耗量，在近年來變得尤為重要。本研究通過運用傾斜攝影及無人駕駛飛行器這兩種遙感技術來構建三維熱模型，該模型可實現多角度觀察，並通過使用實景建模軟件ContextCapture，可透過模型參考實際環境。本研究選取台北市一處校園作為實驗場地，並使用大疆無人飛行器（DJI Mavic 2 ENTERPRISE DUAL）收集數據。採用高效方法以生成分辨率與高精確度的中小型熱模型。該模型可為基於熱特徵的基礎科學數據提供視覺參照、多角度可視化高解析度的研究數據並且對於打造更具可持續性與適應能力的社區來說有很大幫助。  It is important for urban planners to be able to quickly and dynamically assess an environment to minimize the thermal impact and amount of energy consumed in an urban area. We used two state-of-the-art remote sensing (RS) techniques: oblique photography and unmanned aerial vehicles (UAVs), to produce a three-dimensional thermal model that can be observed from multiple angles and can easily refer to the real conditions using the ContextCapture reality modeling software. We use da campus in Taipei as our experimental space and data was collected using the most recent DJI UAV (DJI Mavic 2 Enterprise, dual camera version). We developed a more effective way to generate small to mid-scale thermal models with acceptable resolution and precision. Our model can provide a visual for essential scientific data on thermal features and Multi-angle visualization of high-resolution research data, which is necessary for designing more sustainable and resilient communities.

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Dueholm, K. S., and A. K. Pedersen. "Geological photogrammetry using oblique aerial photographs." Rapport Grønlands Geologiske Undersøgelse 140 (December 31, 1988): 33–38. http://dx.doi.org/10.34194/rapggu.v140.8029.

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Large areas in Greenland are covered by oblique aerial photographs, taken with 23 x 23 cm2 photogrammetric cameras of the type 'EagIe' between 1948 and 1953. Though almost all of Greenland is now covered by modem vertical photographs, the oblique photographs still represent a valuable alternative source of geological information because of the perspective at right angles to the mountain side. So far, geologists have only been able to use the oblique photographs for visual interpretation. New photogrammetric instruments like the Kem DSR U/GPl Analyticai Plotter at the Institute of Surveying and Photogrammetry,the Teehnieal University of Denmark, make it possibie for geologists to map precisely from oblique photographs. This report deseribes an experiment where such photographs have been used for mapping of steep mountain sides for the production of geological maps, cross-seetions and perspective views. Earlier results are reported by Dueholm & Garde (1986) and Heinesen (1987).

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Journal articles on the topic 'Oblique aerial photography'

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