Готові списки джерел за темами / Hemispherical photograph

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Добірка наукової літератури з теми "Hemispherical photograph"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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Статті в журналах з теми "Hemispherical photograph"

Machado, José-Luis, and Peter B. Reich. "Evaluation of several measures of canopy openness as predictors of photosynthetic photon flux density in deeply shaded conifer-dominated forest understory." Canadian Journal of Forest Research 29, no. 9 (1999): 1438–44. http://dx.doi.org/10.1139/x99-102.

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The ability to accurately estimate light levels in shaded environments is important for understanding plant adaptations to shade. This study evaluates the effectiveness of three rapid methods of estimating the long-term integrated percentage of above-canopy photosynthetic photon flux density (PPFD) in a deeply shaded conifer-dominated forest understory. These methods included (i) hemispherical canopy photography, (ii) hemispherical sensors (LAI-2000), and (iii) instantaneous %PPFD. Transmitted PPFD was continuously measured starting in June and ending in November using photodiodes at 60 measur

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Ghazali, Mochamad Firman. "MAPPING THE AIR MOISTURE CHANGE IN UNDER CANOPY TREES USING A HEMISPHERICAL AND AERIAL PHOTOGRAPH BASED ON MACHINE LEARNING APPROACHES." International Journal of Remote Sensing and Earth Sciences (IJReSES) 19, no. 2 (2023): 153. http://dx.doi.org/10.30536/j.ijreses.2022.v19.a3816.

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The essential roles of trees in controlling the local climatic variation, such as air moisture, are still interesting to observe. Therefore, this study must deliver knowledge of the benefits of growing trees and enhance people's awareness of climate change adaptation. Here, the analysis requires several data fields such as hemispherical photography, an aerial photograph of a UAV, and air temperature collected using a wet and dry bulb thermometer, which has converted to air moisture. All these are considered to understand the air moisture change under the trees' canopy during a day observation.

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Umarhadi, Deha Agus, and Projo Danoedoro. "Comparing canopy density measurement from UAV and hemispherical photography: an evaluation for medium resolution of remote sensing-based mapping." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 1 (2021): 356. http://dx.doi.org/10.11591/ijece.v11i1.pp356-364.

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UAV and hemispherical photography are common methods used in canopy density measurement. These two methods have opposite viewing angles where hemispherical photography measures canopy density upwardly, while UAV captures images downwardly. This study aims to analyze and compare both methods to be used as the input data for canopy density estimation when linked with a lower spatial resolution of remote sensing data i.e. Landsat image. We correlated the field data of canopy density with vegetation indices (NDVI, MSAVI, and AFRI) from Landsat-8. The canopy density values measured from UAV and hem

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Deha, Agus Umarhadi, and Danoedoro Projo. "Comparing canopy density measurement from UAV and hemispherical photography: an evaluation for medium resolution of remote sensing-based mapping." International Journal of Electrical and Computer Engineering (IJECE) 11, no. 1 (2021): 356–64. https://doi.org/10.11591/ijece.v11i1.pp356-364.

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Zhao, Kangning, and Fangliang He. "Estimating light environment in forests with a new thresholding method for hemispherical photography." Canadian Journal of Forest Research 46, no. 9 (2016): 1103–10. http://dx.doi.org/10.1139/cjfr-2016-0003.

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Light environment estimates derived from hemispherical photography are known to be affected by variations in sky illumination. During photo acquisition, rapid changes in sky illumination can occur and will result in changes in detected canopy gap size and frequency. Any resulting problems in image consistency will become more serious with increased time lags between setting the reference exposure and hemispherical photograph acquisition. We showed that if the camera exposure setting was kept constant during photo acquisition, the estimated diffuse transmittance would be greatly influenced by s

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Yun, Ting, Weizheng Li, Yuan Sun, and Lianfeng Xue. "Study of Subtropical Forestry Index Retrieval Using Terrestrial Laser Scanning and Hemispherical Photography." Mathematical Problems in Engineering 2015 (2015): 1–14. http://dx.doi.org/10.1155/2015/206108.

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In order to retrieve gap fraction, leaf inclination angle, and leaf area index (LAI) of subtropical forestry canopy, here we acquired forestry detailed information by means of hemispherical photography, terrestrial laser scanning, and LAI-2200 plant canopy analyzer. Meanwhile, we presented a series of image processing and computer graphics algorithms that include image and point cloud data (PCD) segmentation methods for branch and leaf classification and PCD features, such as normal vector, tangent plane extraction, and hemispherical projection method for PCD coordinate transformation. In addi

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Adinugroho, Wahyu Catur, Lilik Budi Prasetyo, Cecep Kusmana, and Haruni Krisnawati. "Spatial-temporal forest canopy density in Indonesia’s new capital city and its surrounding area." IOP Conference Series: Earth and Environmental Science 1266, no. 1 (2023): 012001. http://dx.doi.org/10.1088/1755-1315/1266/1/012001.

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Abstract Monitoring the condition of the forest in Indonesia’s New Capital City, Nusantara (IKN), and the surrounding area as a buffer is crucial to realizing the Forest City concept. Forest canopy density can be used to understand and measure forest conditions using satellite imagery efficiently. The main objective of this study was to investigate the spatial-temporal dynamic alterations of forest canopy density across IKN and its buffer. Forest canopy density is based on Landsat 8 imagery for 2015-2020, processed in the cloud using the Google Earth Engine (GEE) and compared using a hemispher

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Nurdiansah, Doni, and I. Wayan Eka Dharmawan. "Komunitas Mangrove di Wilayah Pesisir Pulau Tidore dan Sekitarnya." Oseanologi dan Limnologi di Indonesia 3, no. 1 (2018): 1. http://dx.doi.org/10.14203/oldi.2018.v3i1.63.

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<strong>Mangrove Community in Coastal Area of Tidore Islands.</strong> Indonesia has the most extensive area of mangrove ecosystem in the world. It bring many direct and indirect benefits for the coastal community. Research on the condition of mangrove communities in Tidore, Halmahera, Ternate Island and surrounding areas was conducted in August 2015, to determine the current condition of mangrove communities in the region. Assessment condition mangrove forest was done by means of analyze the percentage covering canopy with the hemispherical photography methods (photography t

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HU, Ning, Chuan-Gen LÜ, Ke-Min YAO, and Xiao-Cui ZHANG. "Inversion of Rice Canopy Construction Parameters from the Hemispherical Photograph." Acta Agronomica Sinica 40, no. 8 (2014): 1443. http://dx.doi.org/10.3724/sp.j.1006.2014.01443.

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Zhang, Yongqin, Jing M. Chen, and John R. Miller. "Determining digital hemispherical photograph exposure for leaf area index estimation." Agricultural and Forest Meteorology 133, no. 1-4 (2005): 166–81. http://dx.doi.org/10.1016/j.agrformet.2005.09.009.

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Дисертації з теми "Hemispherical photograph"

Berdie, Ian Joseph. "Assessing Canopy Cover Requirements of Storm's Stork (Ciconia stormi) at Multiple Scales." Scholarly Repository, 2008. http://scholarlyrepository.miami.edu/oa_theses/132.

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Much conservation work focuses on individual species, partly because of the perception that wildlife species are effective symbols for raising funds and drawing awareness to environmental causes. However, for species-based studies to aid conservation efforts, the biological and ecological needs of species need to be addressed in a way that informs decisions and provides concrete recommendations for land managers. This thesis addresses the forest cover needs of Ciconia stormi, a rare and understudied bird species that inhabits the islands of Borneo and Sumatra and parts of peninsular Malaysia

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Oldfield, Philippa Jane. "Calling the shots : women's photographic engagement with war in hemispheric America, 1910-1990." Thesis, Durham University, 2016. http://etheses.dur.ac.uk/11786/.

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War photography is conventionally understood to be a hypermasculine practice, undertaken by risk-taking photojournalists in the combat zone. Despite growing scholarship on the fields of photography, war, and gender, there remains little that considers war’s photographic dimension as a charged arena for gender relations. This intellectual limitation impedes understanding of women’s agency and substantial participation at the nexus of war and photography. Rather than single out exceptional female exponents, or offer an essentialist view of ‘feminine’ traits, I show how the discursive constructio

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Battaglia, Michael Anthony. "The Influence of Overstory Structure on Understory Light Availability in a Longleaf Pine (Pinus palustris Mill.) Forest." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/35411.

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Understory light environments are inherently heterogeneous and therefore difficult to characterize. Numerous methods to measure understory light have been assessed in closed-canopied forests; however, the reliability of these methods has not been addressed for open-canopied forests. Therefore, the first objective of this study, presented in Chapter 3, was to test the accuracy and precision of various light measurement techniques at different time scales and sky conditions. The methods assessed performed differently depending on the sky condition and time of year when the sample was taken.

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Smith, Alison M. "Forest ecology in a changing world : effective ground-based methods for monitoring temperate broadleaved forest ecosystem dynamics in relation to climate change." Thesis, University of Plymouth, 2018. http://hdl.handle.net/10026.1/11979.

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The impacts of climate change on temperate forests are predicted to accelerate, with widespread implications for forest biodiversity and function. Remote sensing has provided insights into regional patterns of vegetation dynamics, and experimental studies have demonstrated impacts of specific changes on individual species. However, forests are diverse and complex ecosystems. To understand how different species in different forests respond to interacting environmental pressures, widespread ground-based monitoring is needed. The only practical way to achieve this is through the involvement of no

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Gaxiola, Camacho Ivan Eladio. "Mitigating Urban Heat Island through Integration of Agriculture in the Built Environment in Arid Regions." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/613514.

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Consequences of human activity in natural environments can be observed in urban phenomena. Urban Heat Island is one of those consequences, it is characterized by higher temperature levels in surface-cover and air in urban centers compared with its surrounding rural areas. UHIs are present in cities of arid ecosystems such as Phoenix and Tucson. Existing urban development trends contribute to UHI episodes. Urban Agriculture (UA) is an emerging environmental strategy and, contrary to traditional and industrial agricultural methods, UA systems provide the option of not using soil, its geometrical

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Klooster, Wendy S. "Forest Responses to Emerald Ash Borer-Induced Ash Mortality." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1338337754.

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Pinjuv, Guy L. "Hybrid forest modelling of Pinus Radiata D. Don in Canterbury, New Zealand." Thesis, University of Canterbury. New Zealand School of Forestry, 2006. http://hdl.handle.net/10092/1102.

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During this study two models were developed to predict growth of Pinus radiata D.Don plantations in Canterbury, New Zealand. The first, CanSPBL(1.2), is a model for whole rotations of stands owned by Selwyn Plantation Limited in Canterbury. The second model, CanSPBL(water) is a hybrid growth model for the Selwyn estate in Canterbury that incorporates an index of root zone water balance over the simulation period. An existing stand growth and yield model CanSPBL was examined using a validation dataset of PSP measurements that were not used in model fitting. Projection bias was shown for mean to

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Yauschew-Raguenes, Nathalie. "Dynamique saisonnière de la végétation forestière (arbres et sous-bois) dans le massif des Landes : application de la télédétection optique au suivi des hétérogénéités à l'échelle régionale." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14702/document.

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L’objectif de la thèse est d'évaluer l’apport des données satellites dans le suivi saisonnier de la végétation forestière (sous-bois et strate arborée). L'étude a été conduite sur la forêt landaise. Elle est basée sur une série de sept ans d'observations satellitaires décadaires d’un indice de végétation (PVI) et de mesures in situ de la surface foliaire (LAI) du sous-bois et des arbres. Tout d’abord, les observations in-situ ont été analysées. Elles montrent que le sous-bois est le déterminant majeur de la trajectoire saisonnière du LAI de l’ensemble du couvert végétal.

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Turton, Rachael Heather. "The impact of the radiation balance on snowmelt in a sparse deciduous birch forest." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/29567.

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The representation of high-latitude surface processes and quantifying surface-climate feedbacks are some of the most serious shortcomings of present day Arctic land surface modelling. The energy balance of seasonally snow-covered sparse deciduous forests at high latitudes is poorly understood and inaccurately represented within hydrological and climate models. Snow cover plays an important role in wintertime fluxes of energy, water and carbon, controlling the length of the active growing season and hence the overall carbon balance of Arctic ecosystems. Snow cover is non-uniform and spatially v

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Lima, Renato Augusto Ferreira de. "Regime de distúrbio e dinâmica da regeneração natural na Floresta Pluvial Atlântica Submontana." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/11/11150/tde-12062007-094338/.

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Em uma parcela permanente de 10,24 ha na Floresta Pluvial Atlântica Submontana do Parque Estadual Carlos Botelho (Sete Barras, SP, Brasil), este estudo teve o intuito de descrever o regime de distúrbio do dossel e avaliar a regeneração natural sob diferentes regimes de luz. Para tanto, foi realizado o levantamento de todas as clareiras da parcela, que foram mensuradas e tiveram sua idade aproximada estimada. Em seguida, foram instaladas 42 parcelas de 10x10m para avaliar a regeneração natural em três regimes luminosos: dossel contínuo (18 parcelas), clareiras pequenas a médias (11) e clareiras

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Книги з теми "Hemispherical photograph"

Mitchell, P. L. Use of hemispherical photographs in forest ecology. Oxford Forestry Institute, 1993.

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Fournier, Richard A., and Ronald J. Hall, eds. Hemispherical Photography in Forest Science: Theory, Methods, Applications. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3.

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Smith, W. Rick. SUNSHINE: A light environment simulation system based on hemispherical photographs. U.S. Dept. of Agriculture, Forest Service, Southern Forest Experiment Station, 1991.

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Lynn, Somers Greg, and Southern Forest Experiment Station (New Orleans, La.), eds. SUNSHINE: A light environment simulation system based on hemispherical photographs. U.S. Dept. of Agriculture, Forest Service, Southern Forest Experiment Station, 1991.

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Frazer, G. W. A method for estimating canopy openness, effective leaf area index, and photosynthetically active photon flux density using hemispherical photography and computerized image analysis techniques. Pacific Forestry Centre, 1997.

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Fournier, Richard A., and Ronald J. Hall. Hemispherical Photography in Forest Science: Theory, Methods, Applications. Springer, 2017.

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Fournier, Richard A., and Ronald J. Hall. Hemispherical Photography in Forest Science: Theory, Methods, Applications. Springer, 2018.

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National Aeronautics and Space Administration (NASA) Staff. Boreas Te-23 Canopy Architecture and Spectral Data from Hemispherical Photographs. Independently Published, 2018.

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Частини книг з теми "Hemispherical photograph"

Zhou, Lianqing, Guiying Pan, and Zhou Shi. "Methodology Comparison for Effective LAI Retrieving Based on Digital Hemispherical Photograph in Rice Canopy." In Computer and Computing Technologies in Agriculture IV. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-18336-2_9.

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Leblanc, Sylvain G., and Richard A. Fournier. "Measurement of Forest Structure with Hemispherical Photography." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_3.

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Fournier, Richard A., Daniel Mailly, Jean-Michel N. Walter, and Inge G. C. Jonckheere. "Acquiring Hemispherical Photographs in Forest Environments: From Planning to Archiving Photographs." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_4.

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Schleppi, Patrick, and Alain Paquette. "Solar Radiation in Forests: Theory for Hemispherical Photography." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_2.

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Jonckheere, Inge G. C., Craig Macfarlane, and Jean-Michel N. Walter. "Image Analysis of Hemispherical Photographs, Algorithms and Calculations." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_5.

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Hall, Ronald J., Jean-François Côté, Daniel Mailly, and Richard A. Fournier. "Comparison of Software Tools for Analysis of Hemispherical Photographs." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_7.

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Mailly, Daniel. "Hemispherical Photography in Support of Forest Inventory and Silviculture." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_8.

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Côté, Jean-François, Richard A. Fournier, and Michel M. Verstraete. "Canopy Architectural Models in Support of Methods Using Hemispherical Photography." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_9.

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Fournier, Richard A., and Ronald J. Hall. "Hemispherical Photography in Forest Science: Conclusions, Applications, Limitations, and Implementation Perspectives." In Managing Forest Ecosystems. Springer Netherlands, 2017. http://dx.doi.org/10.1007/978-94-024-1098-3_10.

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Su, Zhi-yao, Yu-duan Ou, and Dan-dan Xie. "Predicting SOC Concentrations in a Subtropical Mixed Secondary Forest Using Hemispherical Photography." In Advances in Intelligent and Soft Computing. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-27537-1_45.

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Тези доповідей конференцій з теми "Hemispherical photograph"

Yang, Yi, Xuefen Wan, Jian Cui, Tao Zheng, Xueqin Jiang, and Jingwen Zhang. "Smartphone based hemispherical photography for canopy structure measurement." In International Conference on Optical Instruments and Technology 2017: Optoelectronic Measurement Technology and System, edited by Jigui Zhu, Kexin Xu, Liquan Dong, Hwa-Yaw Tam, and Hai Xiao. SPIE, 2018. http://dx.doi.org/10.1117/12.2285911.

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Momoki, Satoru, Kaoru Toyoda, Takashi Yamada, Toru Shigechi, and Tomohiko Yamaguchi. "Experiments and Analysis on Film Boiling Heat Transfer Around a Finite-Length Vertical Cylinder With a Convex Surface Swelling Downward." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48307.

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A method of predicting the overall heat transfer coefficient and the temperature at the lower limit of film boiling for a finite-length cylinder with flat top and bottom surfaces has been researched and proposed in a previous paper. This paper presents and compares an analysis in the case of a cylinder with a hemispherical bottom. The film boiling heat transfer around a vertical silver cylinder with a convex hemispherical bottom surface is investigated both experimentally and analytically in the present study. The obtained results are also compared and discussed with the authors’ previous resu

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Wang, Peicheng, Ling Tong, Xing Zhou, et al. "Estimation of Leaf Area Index Based on Hemispherical Canopy Photography." In IGARSS 2021 - 2021 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2021. http://dx.doi.org/10.1109/igarss47720.2021.9554699.

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Srivastava, Suyashi, Swati Puchalapalli, and Dr Marshal Maskarenj. "Tree shading factor as input for thermal model through hemispherical photography." In 2021 Building Simulation Conference. KU Leuven, 2021. http://dx.doi.org/10.26868/25222708.2021.30272.

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Pelc-Mieczkowska, Renata. "Primary results of using hemispherical photography for advanced GPS mission planning." In The 9th International Conference "Environmental Engineering 2014". Vilnius Gediminas Technical University Press “Technika” 2014, 2014. http://dx.doi.org/10.3846/enviro.2014.236.

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Leblanc, Sylvain G., and Richard A. Fournier. "Leaf area index retrieval study with a modelling framework, hemispherical photography and LiDARs." In IGARSS 2014 - 2014 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2014. http://dx.doi.org/10.1109/igarss.2014.6946684.

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Pirotti, Francesco, Marco Piragnolo, and Raffaele Cavalli. "Simulating Solar Radiation Under Canopy Using Point Clouds and an Hemispherical Photography Simulator." In GIS Ostrava 2022 Earth Observation for Smart City and Smart Region. VŠB - TU Ostrava, 2022. http://dx.doi.org/10.31490/9788024846026-5.

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Liu, Yuan, Yingying Gai, Gaoxing Chen, et al. "Estimating clumping index of sparse forest using hemispherical photographs combined with Geoeye-1 data." In IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2012. http://dx.doi.org/10.1109/igarss.2012.6350692.

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Jiao, Shuaifeng, Yunping Chen, Yuanlei Cheng, et al. "MEF-DHP: Digital Hemispheric Photography Method Based On Multi-Exposure Fusion." In IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2023. http://dx.doi.org/10.1109/igarss52108.2023.10282038.

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Umarhadi, Deha Agus, Proio Danoedoro, Pramaditya Wicaksono, Prima Widayani, Wahvu Nurbandi, and Anwar Juniansah. "The Comparison of Canopy Density Measurement Using UAV and Hemispherical Photography for Remote Sensing Based Mapping." In 2018 4th International Conference on Science and Technology (ICST). IEEE, 2018. http://dx.doi.org/10.1109/icstc.2018.8528670.

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Звіти організацій з теми "Hemispherical photograph"

Rich, P. A manual for analysis of hemispherical canopy photography. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/7064866.

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