Academic literature on the topic 'Photoscan'
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Journal articles on the topic "Photoscan"
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Kameyama, Shohei, and Katsuaki Sugiura. "Effects of Differences in Structure from Motion Software on Image Processing of Unmanned Aerial Vehicle Photography and Estimation of Crown Area and Tree Height in Forests." Remote Sensing 13, no. 4 (February 9, 2021): 626. http://dx.doi.org/10.3390/rs13040626.
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This study examines the effects of differences in structure from motion (SfM) software on image processing of aerial images by unmanned aerial vehicles (UAV) and the resulting estimations of tree height and tree crown area. There were 20 flight conditions for the UAV aerial images, which were a combination of five conditions for flight altitude, two conditions for overlap, and two conditions for side overlap. Images were then processed using three SfM programs (Terra Mapper, PhotoScan, and Pix4Dmapper). The tree height and tree crown area were determined, and the SfM programs were compared based on the estimations. The number of densified point clouds for PhotoScan (160 × 105 to 50 × 105) was large compared to the two other two SfM programs. The estimated values of crown area and tree height by each SfM were compared via Bonferroni multiple comparisons (statistical significance level set at p < 0.05). The estimated values of canopy area showed statistically significant differences (p < 0.05) in 14 flight conditions for Terra Mapper and PhotoScan, 16 flight conditions for Terra Mapper and Pix4Dmapper, and 11 flight conditions for PhotoScan and Pix4Dmappers. In addition, the estimated values of tree height showed statistically significant differences (p < 0.05) in 15 flight conditions for Terra Mapper and PhotoScan, 19 flight conditions for Terra Mapper and Pix4Dmapper, and 20 flight conditions for PhotoScan and Pix4Dmapper. The statistically significant difference (p < 0.05) between the estimated value and measured value of each SfM was confirmed under 18 conditions for Terra Mapper, 20 conditions for PhotoScan, and 13 conditions for Pix4D. Moreover, the RMSE and rRMSE values of the estimated tree height were 5–6 m and 20–28%, respectively. Although the estimation accuracy of any SfM was low, the estimated tree height by Pix4D in many flight conditions had smaller RMSE values than the other software. As statistically significant differences were found between the SfMs in many flight conditions, we conclude that there were differences in the estimates of crown area and tree height depending on the SfM used. In addition, Pix4Dmapper is suitable for estimating forest information, such as tree height, and PhotoScan is suitable for detailed monitoring of disaster areas.
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Jiroušek, Tomáš, Roman Kapica, and Dana Vrublová. "THE TESTING OF PHOTOSCAN 3D OBJECT MODELLING SOFTWARE." Geodesy and cartography 40, no. 2 (June 24, 2014): 68–74. http://dx.doi.org/10.3846/20296991.2014.930251.
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The paper presents triangulation-based accuracy test procedures for PhotoScan 3D modelling software with automatic features including camera station identification, point cloud construction and the generation of polygon networks and polygon net textures. The process starts with establishing the camera resolutions. Then, internal orientation elements of the cameras are established by means of different calibration techniques and comparisons between them are made. 3D models are then tested using diverse model generation parameters and different configurations of sets of images including how each type of calibration affects the resulting 3D model accuracy. To conclude, 3D model accuracy is compared with geodesic surveying results.
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Inozemtsev, Dmitriy P. "Air photography by means of hardware-software solution GeoScan-PhotoScan." SAPR i GIS avtomobilnykh dorog, no. 1(2) (2014): 46–51. http://dx.doi.org/10.17273/cadgis.2014.1.10.
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Jebur, Ahmed, Fanar Abed, and Mamoun Mohammed. "Assessing the performance of commercial Agisoft PhotoScan software to deliver reliable data for accurate3D modelling." MATEC Web of Conferences 162 (2018): 03022. http://dx.doi.org/10.1051/matecconf/201816203022.
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3D models delivered from digital photogrammetric techniques have massively increased and developed to meet the requirements of many applications. The reliability of these models is basically dependent on the data processing cycle and the adopted tool solution in addition to data quality. Agisoft PhotoScan is a professional image-based 3D modelling software, which seeks to create orderly, precise n 3D content from fixed images. It works with arbitrary images those qualified in both controlled and uncontrolled conditions. Following the recommendations of many users all around the globe, Agisoft PhotoScan, has become an important source to generate precise 3D data for different applications. How reliable is this data for accurate 3D modelling applications is the current question that needs an answer. Therefore; in this paper, the performance of the Agisoft PhotoScan software was assessed and analyzed to show the potential of the software for accurate 3D modelling applications. To investigate this, a study was carried out in the University of Baghdad / Al-Jaderia campus using data collected from airborne metric camera with 457m flying height. The Agisoft results show potential according to the research objective and the dataset quality following statistical and validation shape analysis.
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Horst Gamba, Sergio Roberto, and Edson Eyji Sano. "Avaliação do PEC em ortofotomosaicos obtidos com RPA e proposta de um modelo matemático para correção geométrica." Revista Brasileira de Geomática 8, no. 4 (November 6, 2020): 314. http://dx.doi.org/10.3895/rbgeo.v8n4.11346.
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O objetivo deste artigo é avaliar o padrão de exatidão cartográfica (PEC) em ortofotomosaicos digitais obtidos por meio de uma aeronave pilotada remotamente e propor um modelo de correção geométrica para o ângulo de guinada, a fim de reduzir a distorção do pixel na imagem. Este artigo é uma continuação dos trabalhos de GAMBA e SANO (2017). As áreas de teste estão localizadas nos estados do RJ (Área 1) e MG (Área 2). A metodologia foi dividida em quatro etapas: planejamento e execução do voo; determinação dos pontos de apoio; geração dos ortofotomosaicos nos aplicativos Agisoft Photoscan® e E-Foto®; e avaliação dos ortofotomosaicos. A avaliação dos ortofotomosaicos foi feita por meio da aplicação do PEC analógico e digital, utilizando o método disponível no aplicativo GeoPEC®. Nesta avaliação, foram verificados o comportamento da distribuição espacial, a normalidade e a acurácia posicional das amostras, com análises de tendência e de precisão. Os resultados demonstraram que os menores erros médios quadráticos (EMQ) na planimetria das Áreas 1 (1,4337m) e 2 (1,1073m) foram no aplicativo Agisoft Photoscan®. O menor EMQ na altimetria da Área 1 (9,5387m) foi no aplicativo E-Foto®. O menor EMQ na altimetria da Área 2 (21,0263 m) foi no aplicativo Agisoft Photoscan®.
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Lumban-Gaol, Y. A., A. Murtiyoso, and B. H. Nugroho. "INVESTIGATIONS ON THE BUNDLE ADJUSTMENT RESULTS FROM SFM-BASED SOFTWARE FOR MAPPING PURPOSES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-2 (May 30, 2018): 623–28. http://dx.doi.org/10.5194/isprs-archives-xlii-2-623-2018.
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Since its first inception, aerial photography has been used for topographic mapping. Large-scale aerial photography contributed to the creation of many of the topographic maps around the world. In Indonesia, a 2013 government directive on spatial management has re-stressed the need for topographic maps, with aerial photogrammetry providing the main method of acquisition. However, the large need to generate such maps is often limited by budgetary reasons. Today, SfM (Structure-from-Motion) offers quicker and less expensive solutions to this problem. However, considering the required precision for topographic missions, these solutions need to be assessed to see if they provide enough level of accuracy. In this paper, a popular SfM-based software Agisoft PhotoScan is used to perform bundle adjustment on a set of large-scale aerial images. The aim of the paper is to compare its bundle adjustment results with those generated by more classical photogrammetric software, namely Trimble Inpho and ERDAS IMAGINE. Furthermore, in order to provide more bundle adjustment statistics to be compared, the Damped Bundle Adjustment Toolbox (DBAT) was also used to reprocess the PhotoScan project. Results show that PhotoScan results are less stable than those generated by the two photogrammetric software programmes. This translates to lower accuracy, which may impact the final photogrammetric product.
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Skorobogatova, Anastasia, and Elena Khlebnikova. "POSSIBILITY OF CREATING A DIGITAL ORTHOPHOTO BASED ON AERIAL PHOTOGRAPHY WHILE UPDATING MAPS ON THE TERRITORY OF THE REPUBLIC OF KAZAKHSTAN." Interexpo GEO-Siberia 6, no. 2 (2019): 222–29. http://dx.doi.org/10.33764/2618-981x-2019-6-2-222-229.
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The stages of orthophotoplan creation in the software complex PHOTOMOD Lite and similar functionality of the software complex Agisoft PhotoScan for further research of their application in production as an alternative to the software product of Leica Geosystems "Leica Photogrammetry Suite" are considered.
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Niederheiser, Robert, Martin Mokroš, Julia Lange, Helene Petschko, Günther Prasicek, and Sander Oude Elberink. "DERIVING 3D POINT CLOUDS FROM TERRESTRIAL PHOTOGRAPHS - COMPARISON OF DIFFERENT SENSORS AND SOFTWARE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 16, 2016): 685–92. http://dx.doi.org/10.5194/isprs-archives-xli-b5-685-2016.
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Terrestrial photogrammetry nowadays offers a reasonably cheap, intuitive and effective approach to 3D-modelling. However, the important choice, which sensor and which software to use is not straight forward and needs consideration as the choice will have effects on the resulting 3D point cloud and its derivatives. <br><br> We compare five different sensors as well as four different state-of-the-art software packages for a single application, the modelling of a vegetated rock face. The five sensors represent different resolutions, sensor sizes and price segments of the cameras. The software packages used are: (1) Agisoft PhotoScan Pro (1.16), (2) Pix4D (2.0.89), (3) a combination of Visual SFM (V0.5.22) and SURE (1.2.0.286), and (4) MicMac (1.0). We took photos of a vegetated rock face from identical positions with all sensors. Then we compared the results of the different software packages regarding the ease of the workflow, visual appeal, similarity and quality of the point cloud. <br><br> While PhotoScan and Pix4D offer the user-friendliest workflows, they are also “black-box” programmes giving only little insight into their processing. Unsatisfying results may only be changed by modifying settings within a module. The combined workflow of Visual SFM, SURE and CloudCompare is just as simple but requires more user interaction. MicMac turned out to be the most challenging software as it is less user-friendly. However, MicMac offers the most possibilities to influence the processing workflow. The resulting point-clouds of PhotoScan and MicMac are the most appealing.
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Niederheiser, Robert, Martin Mokroš, Julia Lange, Helene Petschko, Günther Prasicek, and Sander Oude Elberink. "DERIVING 3D POINT CLOUDS FROM TERRESTRIAL PHOTOGRAPHS - COMPARISON OF DIFFERENT SENSORS AND SOFTWARE." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B5 (June 16, 2016): 685–92. http://dx.doi.org/10.5194/isprsarchives-xli-b5-685-2016.
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Terrestrial photogrammetry nowadays offers a reasonably cheap, intuitive and effective approach to 3D-modelling. However, the important choice, which sensor and which software to use is not straight forward and needs consideration as the choice will have effects on the resulting 3D point cloud and its derivatives. <br><br> We compare five different sensors as well as four different state-of-the-art software packages for a single application, the modelling of a vegetated rock face. The five sensors represent different resolutions, sensor sizes and price segments of the cameras. The software packages used are: (1) Agisoft PhotoScan Pro (1.16), (2) Pix4D (2.0.89), (3) a combination of Visual SFM (V0.5.22) and SURE (1.2.0.286), and (4) MicMac (1.0). We took photos of a vegetated rock face from identical positions with all sensors. Then we compared the results of the different software packages regarding the ease of the workflow, visual appeal, similarity and quality of the point cloud. <br><br> While PhotoScan and Pix4D offer the user-friendliest workflows, they are also “black-box” programmes giving only little insight into their processing. Unsatisfying results may only be changed by modifying settings within a module. The combined workflow of Visual SFM, SURE and CloudCompare is just as simple but requires more user interaction. MicMac turned out to be the most challenging software as it is less user-friendly. However, MicMac offers the most possibilities to influence the processing workflow. The resulting point-clouds of PhotoScan and MicMac are the most appealing.
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Ramzy Jame, Ahmed e., and Raad Awad Kattan. "The Efficiency Employment of Close-range Photogrammetry to Measure And Model Potholes in Asphalt Pavement." Journal Of Duhok University 23, no. 2 (December 9, 2020): 179–97. http://dx.doi.org/10.26682/sjuod.2020.23.2.19.
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The objective of this study is to measure and model potholes distress in the pavement road surface, which form a major type among several distresses exist in road networks. In this research close-range photogrammetry is used to represent potholes distress, this approach allows converting images of the studied potholes into a 3-D model. Ground control points (GCPs) have to be distributed uniformly to cover the whole measured area helping to solve analytically for the unknown coordinates of the measured area point cloud and acquiring a georeferenced model with known coordinates. Agisoft PhotoScan was used for potholes modelling, which is a user-friendly software that allows for 3- D modelling, producing digital elevation models, point clouds, and orthomosaic. The Agisoft PhotoScan initial assessment test on a model similar in shape to a real pothole reviles that the best accuracy acquired using 8 GCPs distributed regularly to cover the shape of the pothole have a maximum discrepancy of - 2.16cm in Z coordinates of one point. The obtained root mean square errors RMS were ±0.79 ±0.78 ±0.67cm in X, Y, and Z coordinates respectively. In a real pothole modelling tests on two sites and comparing the model check points coordinates with the ground coordinates, the RMS obtained were, ±0.85, ±0.58, ±0.44 cm and ±0.32, ±0.27, ±0.39cm in X, Y and Z coordinates respectively. Both potholes can be classified as high level potholes as their depths are more than 50mm in accordance with known specifications. In volume test carried out on the first model, the Agisoft PhotoScan generated volume was 8413 cm3 confirmed the volume measured with the standard soil test known as sand replacement method which gave a volume of 8311 cm3
Dissertations / Theses on the topic "Photoscan"
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Stensson, Lily. "Spatial Accuracy in Orthophoto produced using UAV Photographic Images." Thesis, Karlstads universitet, Fakulteten för samhälls- och livsvetenskaper, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-46245.
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The popularity of using UAV in image-taking for the production of 3D models and orthophotos has increased over time. Karlskoga Municipality has recently acquired an UAV to produce their own 3D models and orthophotos. This project paper aims to study the geospatial accuracy of the orthophotos and DEM files produced using the images taken with their UAV. The flight takes only a few minutes but a considerable time is spent in the production processes. Difficulty is experienced in determining the right center point for most GCPs. Produced orthophotos in the software Photoscan have a resolution from 1.7 to 2.4 centimeters while DEM files have a resolution from 3.4 to 4.8 centimeters. Four orthophotos and four DEM files are produced where GCPs are used and not used and at two different flight heights, 76 and 105 meters. The spatial data of the ten GCPs are identified on the orthophotos and DEM files in ArcMap and compared with GNSS NRTK measurements and Lantmäteriet's data. A visual control in terms of completeness of data, alignment, residual tilt and scale is also done. Standard deviations in plane for orthophotos there GCPs are not used are greater than 2 meters, while there GCPs are used are around 0.7 meters. Standard deviations for DEM files are observed at 0.8 meters.
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Karlsson, Peter, and Kalle Friberg. "Kvalitetskontroll av en 3D-modells ärdvda georeferering : Med hjälp av crowdsourcing för insamling av data." Thesis, Högskolan i Gävle, Samhällsbyggnad, GIS, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-25908.
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Städer och infrastruktur är i ständig utveckling och arbetet att uppdatera befintlig och äldre data blir ett mödosamt och dyrt arbete. Lantmäteriet undersöker möjligheter att effektivisera samhällsprocessen med hjälp av 3D-data. Det är framförallt en lösning på en mer effektiv detaljplanering och byggprocess som önskas. Vi föreslår en metod där en äldre georeferering hos en 3D-modell utnyttjas för att uppdatera modellen med nytt objekt. Detta betyder att georefereringen ärvs från det äldre objektet. Syftet med studien är att utföra tester och avgöra om lägesosäkerhet som Lantmäteriet ställer som krav vid utförande av detaljmätning ka nuppnås. Kommer det nya objektet att ärva den äldre georefereringen, och vilken avvikelse går det att uppnå i relation mellan nytt objekt och äldre modell? Det nya objektet fotograferas med olika kameror för att simulera en imaginär men realistisk situation, där bilder har samlats in genom crowdsourcing och microtasks. En modell skapades över hus 45 Högskolan Gävle med hjälp av äldre bilder som fotograferats med en UAS. Fotograferingen skedde på 70 m flyghöjd, där även snedbilder har tagits med en lägre flyghöjd runt byggnaden. I programmet Agisoft PhotoScan användes bilderna för att skapa 3D-punktmoln och 3D-bildmodeller. Studien visar att nya objekt kan ärva georeferering från en äldre modell. Ett snitt från båda hörnen visar ett resultat över testmätningar visar en sammanlagd avvikelse i plan på 0,051 m och 0,041 m i höjd. Lantmäteriet ställer krav för detaljmätning med fyra standardnivåer. Där standardnivå 2 har som krav att en lägesosäkerhet på som mest 0,1 m ska kunna garanteras, en nivå som används för kommunaldetaljplanering och vid detaljplanering av tätort. Två olika tekniker används för att utföra mätningar, direkt i 3D-bildsmodell och direkt i 3D-punktmoln, mätningarna utförs även i 2D och i 3D. Det stora problemet med metoden är arbetstiden är väldigt stor, och att Agisoft PhotoScan har begränsningar och direkta problem när det ska användas för att utföra mätningar i en 3D-bildmodell.
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Miller, Jordan Mitchell. "Estimation of individual tree metrics using structure-from-motion photogrammetry." Thesis, University of Canterbury. Geography, 2015. http://hdl.handle.net/10092/11035.
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The deficiencies of traditional dendrometry mean improvements in methods of tree mensuration are necessary in order to obtain accurate tree metrics for applications such as resource appraisal, and biophysical and ecological modelling. This thesis tests the potential of SfM-MVS (Structure-fromMotion with Multi-View Stereo-photogrammetry) using the software package PhotoScan Professional, for accurately determining linear (2D) and volumetric (3D) tree metrics. SfM is a remote sensing technique, in which the 3D position of objects is calculated from a series of photographs, resulting in a 3D point cloud model. Unlike other photogrammetric techniques, SfM requires no control points or camera calibration. The MVS component of model reconstruction generates a mesh surface based on the structure of the SfM point cloud.
The study was divided into two research components, for which two different groups of study trees were used: 1) 30 small, potted ‘nursery’ trees (mean height 2.98 m), for which exact measurements could be made and field settings could be modified, and; 2) 35 mature ‘landscape’ trees (mean height 8.6 m) located in parks and reserves in urban areas around the South Island, New Zealand, for which field settings could not be modified.
The first component of research tested the ability of SfM-MVS to reconstruct spatially-accurate 3D models from which 2D (height, crown spread, crown depth, stem diameter) and 3D (volume) tree metrics could be estimated. Each of the 30 nursery trees was photographed and measured with traditional dendrometry to obtain ground truth values with which to evaluate against SfM-MVS estimates. The trees were destructively sampled by way of xylometry, in order to obtain true volume values. The RMSE for SfM-MVS estimates of linear tree metrics ranged between 2.6% and 20.7%, and between 12.3% and 47.5% for volumetric tree metrics. Tree stems were reconstructed very well though slender stems and branches were reconstructed poorly.
The second component of research tested the ability of SfM-MVS to reconstruct spatially-accurate 3D models from which height and DBH could be estimated. Each of the 35 landscape trees, which varied in height and species, were photographed, and ground truth values were obtained to evaluate against SfM-MVS estimates. As well as this, each photoset was thinned to find the minimum number of images required to achieve total image alignment in PhotoScan and produce an SfM point cloud (minimum photoset), from which 2D metrics could be estimated. The height and DBH were estimated by SfM-MVS from the complete photosets with RMSE of 6.2% and 5.6% respectively. The height and DBH were estimated from the minimum photosets with RMSE of 9.3% and 7.4% respectively. The minimum number of images required to achieve total alignment was between 20 and 50. There does not appear to be a correlation between the minimum number of images required for alignment and the error in the estimates of height or DBH (R2 =0.001 and 0.09 respectively). Tree height does not appear to affect the minimum number of images required for image alignment (R 2 =0.08).
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Larsson, Johan, and Marcus Stark. "Utvärdering av lägesosäkerheter i ortofoton framtagna med hjälp av DJI Phantom 4 RTK." Thesis, Högskolan i Gävle, Samhällsbyggnad, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-29914.
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Flygfotografering med Unmanned Aircraft System (UAS) är i jämförelse med traditionell fotogrammetri effektivare, billigare och säkrare vilket har medfört att denna teknik föredras av många aktörer. Ett tidskrävande arbete som varit svårt att kringgå är att etablera flygsignaler på marken som används för att georeferera och kontrollera flygbilderna med. Under 2018 presenterade UAS-tillverkaren DJI sin nya quadcopter med integrerad Real-Time Kinematic (RTK)-modul. I samband med detta kan kontinuerliga och noggranna positioner levereras via Nätverks-RTK (NRTK) och behovet av markstödpunkter reduceras. I denna studie undersöktes lägesosäkerheterna i plan för ortofoton som framställdes med hjälp av en DJI Phantom 4 RTK där flygbilderna georefererades med begränsat antal eller utan markstödpunkter. Lägesosäkerheterna beräknades och kontrollerades enligt Handbok i mät- och kartfrågor (HMK) – Ortofoto, vilket är ett stöddokument inom ämnet. Vid framställning av ett ortofoto krävs även en digital terrängmodell (DTM) eller en digital ytmodell (Digital Surface Model, DSM) och kvaliteten av denna har stor inverkan på ortofotots kvalitet. I denna studie kontrollerades och utvärderades därför en del av den DSM som användes vid ortofotoframställning för respektive uppsättning enligt den tekniska specifikationen SIS-TS 21144:2016. Resultatet från studien visar att ett ortofoto går att framställas utan markstödpunkter och samtidigt klara kraven på specificerad lägesosäkerhet enligt HMK-standardnivå 3. Den sammanlagda lägesosäkerheten beräknades till 0,029 m vilket är 5 mm högre i jämförelse med ett ortofoto som baserats på traditionell georefereringsmetod, dvs. med markstödpunkter. Kravet på kvalitet i höjddata uppfylldes också för ortofotoframställning trots att en systematisk effekt i höjd uppkom. Denna effekt påverkade inte ortofotots koordinater i plan då standardosäkerheterna i höjd var låga. Resultatet visade att om två markstödpunkter adderades i vardera änden av området, kunde de systematiska effekterna i höjd minimeras och det var då möjligt att skapa en DSM som uppfyller kraven för detaljprojektering (noggrannhetsklass 1–3) enligt SIS-TS 21144:2016.Aerial photography with UAS is in comparison with traditional photogrammetry more efficient, cheaper and safer which has led to this technology being preferred by many performers. A time-consuming job that has been difficult to avoid is to establish signals at the ground that are used for georeferencing and evaluate the results. In 2018, the UAS manufacturer DJI presented its new quadcopter with integrated Real-Time Kinematic (RTK) module. This allows continuous and accurate positions delivered via Network RTK (NRTK) and the need of ground control points can be reduced. In this study, investigations of the position uncertainties in orthophotos produced using a DJI Phantom 4 RTK carried out where the aerial images were georeferenced with limited numbers or without ground control points. The position uncertainties were calculated and controlled according to the Swedish HMK – Ortofoto (Orthophoto) which is a document within the subject. When producing an orthophoto, a digital terrain model (DTM) or a digital surface model (DSM) is also required and the quality of this has a great impact on the result. Therefore, a part of the DSM used for orthophoto production for each set was checked and evaluated according to the Swedish technical specification, SIS-TS 21144:2016. The result of the study shows that an orthophoto can be produced without ground control points and at the same time meet the requirements for specified position uncertainty according to HMK standard level 3. The total position uncertainty was calculated to be 0,029 m, which is 5 mm higher compared to the orthophoto based on the traditional georeferencing method, i.e. with ground control points. The requirement for quality in height data was also met for orthophoto production even though a systematic effect in height occurred. This effect did not affect the plane coordinates in the orthophoto because of the low standard uncertainties in height. The result showed that if two ground control points were added at each end of the area, the systematic effects were minimized, and it was possible to produce a DSM that fulfils the requirements for accuracy class 1-3 according to SIS-TS 21144:2016.
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Rodrigues, Avilmar Antonio. "Uso de veículos aéreos não tripulados para mapeamento e avaliação de erosão urbana." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/6646.
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This research aimed to evaluate the use of Unmanned Aerial Vehicle (UAV) as a platform for taking aerial photographs for mapping erosion planialtimetric located in urban areas. In addition, we evaluated the need to use or not to field control points for the generation of Digital Surface Model (DSM) and ortomosaico as tools to evaluate the erosive process. Despite the wide variation in attitude of aerial photographs that make up the aerophotogrammetric block arising from the instability of the UAV, it was possible to generate the MDS and ortomosaico with or without control points. This research was conducted in two urban erosions located in Goiania in Sector Fonte Nova in the stream of grass and the other in Silvânia called foot-washing. Whole generation of MDS, Digital Surface Model (MDT) and ortomosaico were performed in Agisoft PhotoScan program in semi-automatic processing, if used control points, or automatic without control points. The ortomosaicos generated without control points presented rotation, translation and scale of different generated with support. In addition, MDS generated without control points showed elevation or lowering of the reference surface with respect to the generated control, it is emphasized that these discrepancies are not constant. When performing automatic conversion of MDS to MDT, it was realized that the program was not able to eliminate the shrub vegetation located within the erosion. The vegetation or tree, shrub or undergrowth (grass) prevents proper limitation of erosion to the volume calculation. But unlike the MDS generated between two distinct epochs identifies the changes in the interval of time in areas without vegetation. The use of control points was essential to ensure the orientation, scale and the reference plane in the products generated from aerial photographs and thus evaluate the changes. Anyway, the UAV can be used as a platform for taking aerial photographs for generating cartographic products that enable the mapping and evaluation of erosions.
Esta pesquisa teve por objetivo avaliar a utilização do Veículo Aéreo Não Tripulado (VANT) como plataforma para a tomada de fotografias aéreas para o mapeamento planialtimétrico de erosão situada em zona urbana. Além disso, analisou-se a necessidade de utilização ou não de pontos de controle de campo para a geração de Modelo Digital de Superfície (MDS) e ortomosaico como instrumentos para examinar o processo erosivo. Apesar da grande variação da atitude da aeronave durante a obtenção das fotografias aéreas que compõem o bloco aerofotogramétrico, foi possível gerar o MDS e o ortomosaico com ou sem pontos de controle. Este estudo foi realizado em duas erosões urbanas, uma situada em Goiânia-GO, no Setor Fonte Nova/Córrego do Capim, e a outra em Silvânia-GO, denominada de Lava-Pés. Toda a geração dos MDS, Modelo Digital de Terreno (MDT) e ortomosaico foram realizados no programa Agisoft PhotoScan, em processamento semiautomático (i.e., com pontos de controle) e automático (i.e., sem pontos de controle). Os ortomosaicos gerados sem pontos de controle apresentaram rotação, translação e escala diferente dos gerados com apoio. Ademais, os MDS gerados sem pontos de controle apresentaram elevação ou rebaixamento da superfície de referência em relação aos gerados com controle. Ressalta-se, ainda, que essas discrepâncias não foram constantes. Ao realizar a conversão automática do MDS para o MDT, percebeu-se que o programa não foi capaz de eliminar a vegetação arbustiva localizada no interior da erosão. As vegetações arbórea, arbustiva ou rasteira (gramíneas) impedem a correta delimitação da erosão para o cálculo do volume. Porém, a diferença dos MDS gerados entre duas épocas distintas propicia identificar as alterações ocorridas nesse intervalo de tempo nas regiões sem cobertura vegetal. O uso de pontos de controle foi essencial para garantir a orientação, a escala e o plano de referência nos produtos gerados a partir das fotografias aéreas e, assim, avaliar as modificações da erosão. Por fim, o VANT pode ser utilizado como plataforma para a tomada de fotografias aéreas para gerar produtos cartográficos que possibilitem o mapeamento e as avaliações das erosões, sobretudo em áreas urbanas.
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Sforzato, Marco. "Dall’analisi storica alla ricostruzione digitale della Rocca Brancaleone di Ravenna." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
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Il caso studio della Rocca Brancaleone ha permesso di poter applicare ad un edificio di grande importanza storica e architettonica tecniche di modellazione tridimensionale, basate su applicazioni di modellazione geometrica, con l’obiettivo di creare un modello 3D digitale polifunzionale.
Nel caso specifico della Rocca Brancaleone, un modello tridimensionale di questo tipo risulta molto utile per scopi informativi e documentativi, e nello stesso tempo può essere utilizzato anche come strumento per eventuali interventi di restauro. Inoltre lo studio ha potuto analizzare le possibili criticità nei metodi di acquisizione, modellazione e foto-modellazione tridimensionale, procedimenti applicati frequentemente anche in altri ambiti quali l’architettura e il design industriale, ma usati perfino in settori come il cinema seppure con obiettivi diversi.
Nel caso studio sono state effettuate acquisizioni tridimensionali effettuate tramite applicazioni Structure from Motion. I modelli 3D ottenuti tramite il Reverse Modeling sono caratterizzati da un elevato grado di dettaglio che però di contro li rende molto pesanti e difficili da gestire se non con workstation professionali.
Un’altra importante fase della modellazione risulta l’attribuzione del colore al modello 3D attraverso l’inserimento di una texture, realizzata sia con la tecnica dello Structure from Motion che con l’elaborazione digitale di alcune immagini tramite l’uso di Adobe Photoshop: è stata inoltre applicata una tecnica di rimozione delle ombre e correzione dell’illuminazione che ha permesso di migliorare la qualità della texture.
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Bezzi, Chiara. "Anastilosi e geomatica: ricostruzione fotogrammetrica del tempio di Baalshamin." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016.
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Il tempio di Baalshamin si trovava nell’antica città di Palmira, in Siria.
Risalente al II secolo d.C. era l’edificio meglio conservato dell’intero sito archeologico.
Il 23 agosto 2015 i miliziani dell’Isis, dopo averlo dichiarato profano, lo hanno fatto esplodere.
Questa tesi tratta di geomatica e anastilosi applicate al caso del tempio di Baalshamin.
L’obiettivo è ricostruire fotogrammetricamente il tempio di Baalshamin utilizzando foto turistiche trovate sul web.
Si partirà da un inquadramento storico della città di Palmira, per poi passare ai nostri giorni e toccare argomenti di attualità.
Dopodiché saranno illustrate brevemente le nozioni fondamentali della geomatica e si parlerà di anastilosi.
Nella parte sperimentale della tesi verranno analizzati i prodotti ottenuti dal raddrizzamento fotografico e dalla ricostruzione fotogrammetrica.
Si vuole dimostrare che anche da foto di bassa qualità è possibile ottenere risultati apprezzabili dal punto di vista geometrico. Si vuole inoltre sottolineare l’importanza del turismo e del mondo del web, senza i quali questa tesi non sarebbe stata realizzata.
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Rogoli, Vittorio. "Valutazione comparativa dei software per operazioni aerofotogrammetriche." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/11126/.
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L'elaborato descrive le capacità di vari software di aerofotogrammetria testati con relativa comparazione dei risultati, descrizione degli errori, caratterizzazione delle ottiche delle camera da presa utilizzate. All'inizio dell'elaborato è fornita un'introduzione teorica degli aspetti fondamentali dell'aerofotogrammetria.
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Natal, Aline Martins Duboc. "Influência do pH na interação do Photofrin®, Photogem® e Photosan® com DMPC e lipoproteína de baixa densidade." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-27032008-110609/.
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O efeito do fotossensibilizador na estrutura biológica não é apenas influenciado por suas propriedades fotofísicas, mas também por sua interação específica com biosistemas.Além disso, a localização do fotossensibilizador no tecido tumoral é um importante fator que resulta em diferentes mecanismos de destruição do tumor. Muitos fotossensibilizadores, após administração sistêmica, se ligam às proteínas plasmáticas e com isso são distribuídos em diferentes sítios no organismo. Os fotossensibilizadores hidrofílicos são largamente transportados por albuminas e globilinas e se acumulam preferencialmente no estroma vascular dos tumores. Entretanto, fotossensibilizadores mais hidrofóbicos se ligam às lipoproteínas, principalmente LDL, que promove a entrada do FS na célula através de endocitose mediado por receptor. Sendo assim, a localização do FS depende de sua ligação com as deferentes proteínas plasmáticas, sua farmacocinética e também é influenciada pela diferença entre o tecido normal e tumoral. O tecido tumoral tem pH mais baixo e maior expressão de receptores de LDL do que os tecidos normais, aumentando a seletividade dos FSs as células tumorais. A incorporação de FS hidrofóbicos em lipossomas para a administração sistêmica pode realçar ao transporte deste pelas lipoproteínas. No presente trabalho estudou-se a influência do pH na interação de fotossensibilizadores com lipossomas de DMPC e LDL. Os fotossensibilizadores utilizados nesse estudo foram Photofrin®, Photogem® e Photosan® que são derivados de hematoporfirinas. A metodologia empregada constitui de variação das concentrações de DMPC e LDL para os seguintes valores de pHs 5,0; 7,4 e 9,0, esse último pH utilizou-se somente para DMPC. O complexo FS - DMPC foi obtido por incubação dos FSs na concentração de 10 micro g.mL-1 com diferentes concentrações de DMPC (0 a 400 micro M) por trinta minutos no escuro. Isolou-se o LDL do plasma humano por ultracentrifugação por gradiente de densidade. Após a separação, o complexo FS - LDL foi obtido por incubação (12 horas no escuro) do FS na concentração 10 micro g.mL-1 com diferentes concentrações de LDL (0 a 0,04 micro M). O comportamento desses complexos foi analisado por espectroscopia de absorção ótica e por espectroscopia de fluorescência.The effect of a photosensitizing compound on biological structures is governed not only by its photophysical properties but also by the specificity of its interaction with biosystems. Moreover, localization of the photosensitizer in the tumor tissue is an important factor affecting the outcome as well as mechanism leading to tumor destruction. Following administration, most photosensitizers are bound to blood components and delivered to different sites in the organism. It is generally accepted that hydrophilic photosensitizers are largely transported by albumins and globulins and mainly accumulate in the vascular stroma of tumors. More hydrophobic sensitizers are bound to lipoproteins, which promote drug internalization by cells through endocytosis of the lipoprotein carrier. In this way, uptake and localization depend on the initial plasma binding and the plasma pharmacokinetics of the drug. However, the selective localization of some photosensitizers are influence for the difference between malignant and normal tissues. Notably, the lower pH of the microenvironment usually found in the tumor tissue and the expression of greater number of LDL receptors on the surface of the tumor cells might influence cellular uptake. Delivery to lipoproteins or target tissues may be facilitated and enhanced by the incorporation of lipophilic photosensitizers into liposomes for systemic administration. In the present work we have studied the pH-dependence of the interaction of photosensitizers with DMPC liposomes and low density lipoprotein (LDL). The photosensitizers used in this study are Photofrin®, Photogem® and Photosan®, which are hematoporphyrin derivates. The methodology used to this work, constitute of various concentrations of DMPC liposomes and LDL at different pH values. It were used the 5,0; 7,4 and 9,0 pH values. The DMPC-drug complexes were obtained by incubation of the photosensitizers 10 _g.mL-1 with differents DMPC concentrations for 30 min in the dark. The LDL was isolated from human plasma by sequential density gradient ultracentrifugation. The LDL-drug complexes were obtained by incubation of the photosensitizers 10 _g.mL-1 with differents LDL concentrations. The incubation was performed in a water bath at 20_C for 12 hours in the dark. The comportment of the complexes was analyzed by fluorescence spectroscopy and UV-visible spectroscopy.
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Lange, Christiane [Verfasser]. "Synergistische Effekte einer kombinierten Anwendung von 131I-Photosan und Hyperthermie im Rahmen einer Radionuklidtherapie / Christiane Lange." Lübeck : Zentrale Hochschulbibliothek Lübeck, 2010. http://d-nb.info/1008507989/34.
Full textBooks on the topic "Photoscan"
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McPike, Eugene Fairfield. [Photostat reproduction of a genealogical chart of the Moseley family]. [S.l: E.F. McPike], 1985.
Find full textBook chapters on the topic "Photoscan"
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Heck, Ansgar, Michael Schiller, Dieter Jocham, and Heyke Diddens. "Photodynamische Therapie mit Photosan 3 und mikrosekunden Laserpulsen." In Laser in der Medizin / Laser in Medicine, 113–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 1994. http://dx.doi.org/10.1007/978-3-642-93548-0_27.
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Gottschlich, S., W. Schade, B. M. Lippert, and J. A. Werner. "Time-Resolved Laser Spectroscopy Studies on Adriamycin and Photosan-3." In Laser in der Medizin / Laser in Medicine, 631–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 1996. http://dx.doi.org/10.1007/978-3-642-80264-5_147.
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Hendrich, C., G. Hüttmann, G. Dröge, J. Seara, T. Gomille, C. Lehnert, S. Houserek, and W. E. Siebert. "Experimental Photodynamic Laser Therapy for Rheumatoid Arthritis Using Photosan-3, 5-ALA-Induced PPIX and BPD Verteporfin in an Animal Model." In Lasers in the Musculoskeletal System, 69–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56420-8_10.
Full textConference papers on the topic "Photoscan"
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Lin, Jingyu, Ran Wang, Lu Li, and Zhouxuan Xiao. "A Workflow of SfM-Based Digital Outcrop Reconstruction Using Agisoft PhotoScan." In 2019 IEEE 4th International Conference on Image, Vision and Computing (ICIVC). IEEE, 2019. http://dx.doi.org/10.1109/icivc47709.2019.8980982.
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Скоробогатова, Анастасия Сергеевна, and Елена Павловна Хлебникова. "ВОЗМОЖНОСТИ СОЗДАНИЯ ОРТОФОТОПЛАНОВ В ПРОГРАММНЫХ ПРОДУКТАХ PHOTOMOD И AGISOFT PHOTOSCAN ПО МАТЕРИАЛАМ АЭРОФОТОСЪЕМКИ С ИСПОЛЬЗОВАНИЕМ БПЛА." In Сборник материалов III научно-практической конференции "Регулирование земельно-имущественных отношений в России: правовое и геопространственное обеспечение, оценка недвижимости, экология, технологические решения". СГУГиТ, 2020. http://dx.doi.org/10.33764/2687-041x-2020-2-28-35.
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Беспилотные летательные аппараты все чаще стали применять в картографическом производстве. В статье рассмотрены альтернативные программные продукты, использующиеся для создания ортофотопланов и проведен анализ возможности их использования в картографическом производстсве. Рассмотрены этапы создания ортофотоплана по материалам аэрофотосъемки беспилотным летательным аппаратом в программных продуктах PHOTOMOD и Agisoft PhotoScan.
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Pyka, Krystian. "Comparison of Quality of Metric Photos Relative Orientation in Micmac and PhotoScan." In 2017 Baltic Geodetic Congress (BGC Geomatics). IEEE, 2017. http://dx.doi.org/10.1109/bgc.geomatics.2017.23.
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Gabara, Grzegorz, and Piotr Sawicki. "Study on 3D Point Clouds Accuracy of Elongated Object Reconstruction in Close Range – Comparison of Different Software." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.188.
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The image based point clouds generated from multiple different oriented photos enable 3D object reconstruction in a variety spectrum of close range applications. The paper presents the results of testing the accuracy the image based point clouds generated in disadvantageous conditions of digital photogrammetric data processing. The subject of the study was a long shaped object, i.e. the horizontal and rectilinear section of the railway track. DSLR Nikon D5100 camera, 16MP, equipped with the zoom lens (f = 18 ÷ 55mm), was used to acquire the block of terrestrial convergent and very oblique photos at different scales, with the full longitudinal overlap. The point clouds generated from digital images, automatic determination of the interior orientation parameters, the spatial orientation of photos and 3D distribution of discrete points were obtained using the successively tested software: RealityCapture, Photoscan, VisualSFM+SURE and iWitness+SURE. The dense point clouds of the test object generated with the use of RealityCapture and PhotoScan applications were filtered using MeshLab application. The geometric parameters of test object were determined by means of CloudCompare software. The image based dense point clouds allow, in the case of disadvantageous conditions of photogrammetric digital data processing, to determine the geometric parameters of a close range elongated object with the high accuracy (mXYZ < 1 mm).
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Krtalic, Andrija. "COMPARISON OF THE ACCURACY OF DIGITAL SURFACE MODELS CREATED IN PHOTOSCAN AND PHOTOMOD SOFTWARE." In 18th International Multidisciplinary Scientific GeoConference SGEM2018. Stef92 Technology, 2018. http://dx.doi.org/10.5593/sgem2018/2.3/s10.011.
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Fanshuri, Buyung Al, and Yunimar. "Pemetaan Kesehatan Tanaman Jeruk Dengan Metode Supervised Classification Berdasarkan Hasil Citra Drone." In Seminar Nasional Semanis Tani Polije 2021. Politeknik Negeri Jember, 2021. http://dx.doi.org/10.25047/agropross.2021.215.
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Luas tanaman jeruk dilaporkan mengalami penurunan di beberapa daerah. Hal tersebut disebabkan oleh beberapa hal, diantaranya serangan penyakit dan kurangnya perawatan. Badan Pusat Statistik (BPS) hanya menyediakan data luasan produksi saja sehingga informasi tentang luasan tanaman yang sakit belum ada. Pemantauan kondisi tanaman dapat menggunakan penginderaan jauh. Penelitian ini bertujuan untuk mengembangkan metode penginderaan jauh dengan drone untuk mendeteksi kesehatan tanaman jeruk. Lokasi percobaan dilakukan di Banyuwangi dengan menggunakan drone phantom 4 dengan kamera RGB. Hasil foto dianalisa menggunakan software agisoft photoscan dalam beberapa tahap, yaitu: align photos, build dense cloud, build digital elevation model, build orthomosaic dan export geotiff. Ratusan foto akan menjadi satu kesatuan gambar dengan proses tersebut. Hasil proses gambar tersebut kemudian di analisa di software QGIS dengan metode Supervised Classification. Percobaan dilakukan pada tanaman muda dan dewasa. Dengan metode tersebut klasifikasi kesehatan tanaman jeruk dewasa dapat dibagi menjadi tiga, yaitu : sehat, sakit dan mati. Hasil ini kemungkinan bias lebih sedikit dibandingkan pada tanaman muda.
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Fernández-Dávalos, Adriana Karen, Camila Liliana Saavedra-Téllez, José Ramiro Muñoz-Pardo, Juan Pablo Ramos-Machuca, Nahúm Gamalier Cayo-Chileno, and Joaquin Humberto Aquino Rocha. "Análisis comparativo entre los programas Agisoft PhotoScan y Pix4Dmapper para la identificación de fallas en pavimento flexible usando Vehículos Aéreos No Tripulados (VANTs)." In Congresso Internacional sobre Patologia e Reabilitação das Construções. Universidade Federal do Ceará, 2021. http://dx.doi.org/10.4322/cinpar.2021.103.
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Shults, Roman, Petro Krelshtein, Iulia Kravchenko, Olga Rogoza, and Oleksandr Kyselov. "Low-cost Photogrammetry for Culture Heritage." In Environmental Engineering. VGTU Technika, 2017. http://dx.doi.org/10.3846/enviro.2017.237.
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Culture heritage will always remain one of the priorities of any state. Taking a cultural or historical object under protection is impossible without inventory. The best technology, which allows getting high-quality inventory, is close-range photogrammetry. Unfortunately, the full capabilities of this technology is fully owned by professionals only. The situation changed significantly with the advent of mobile devices that are equipped with digital cameras and low-cost software that does not require any special knowledge in the theory and practice of photogrammetry. These developments have been called lowcost photogrammetry technologies. In the present study, we examined the use of smartphones and nano UAV and PhotoScan software for solve the problem fortifications II World War inventory near the city of Kiev. For qualitative data, the calibration of digital cameras in smartphones and ultra-light UAV was performed on calibration bench. One of the features of this project was the integration of the terrestrial photos and photos captured by nano UAVs. As a result of work performed were obtained 3D models of fortifications. Results showed high efficiency of the low-cost photogrammetry technologies. At the end of work some practical guidelines were provided, how to get high-quality data using low-cost photogrammetry technologies.
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Viereck, Volker, Wiebke Werter, Angelika C. Rueck, Rudolf W. Steiner, and J. Keckstein. "Photodynamic therapy of endometriosis with HpD (Photosan III) in a new in vitro model." In OE/LASE '94, edited by Thomas J. Dougherty. SPIE, 1994. http://dx.doi.org/10.1117/12.179970.
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Flytzanis, Christos, Fredrik Jonsson, and Robert Frey. "Photospin state selectrivity, manipulation and storage in photonic structures. Photo-spintronics." In Nonlinear Optics: Materials, Fundamentals and Applications. Washington, D.C.: OSA, 2007. http://dx.doi.org/10.1364/nlo.2007.tua3.
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