10 October 2014 Exploration of the OBIA methods available in SPRING noncommercial software to UAV data processing
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The increasing developments in Unmanned Aerial Vehicles (UAVs) platforms and associated sensing technologies, offer a broad range of solutions for different applications related to the acquisition of information about objects or phenomenon at the Earth. The huge amount of data, provided by UAVs, represents a new challenge regarding developments of image processing techniques. Object-based image classification (OBIA) is highly suitable for very high resolution imagery, where pixel-based classification is less successful due to the high spatial variability within objects of interest. An OBIA approach using SPRING® non-commercial software was implemented in this work. The UAV system used was a Swinglet from Sensefly. The ortho-mosaic, with 0.04 m of pixel size, from 20 of January of 2012 of Coimbra (Portugal) region with an apx. 500×400 m area was processed using the original 41 images. Different “similarity” and “area” parameters combination were computed in the segmentation stage (region-based). Firstly, a supervised classification was employed, considering 7 classes based on Corine land cover nomenclature. For several parameter combinations were obtained a Kappa>0.9 and an overall accuracy >90%. However, several objects were not classified. An unsupervised classification was performed and 27 classes were defined. After, a new supervised classification was performed considered 22 of the 27 classes identified, with an overall accuracy of 82.58%, and a Kappa of 0.817. We conclude that the algorithms employed in this work are not the most suitable for this kind of spatial resolution. The use data mining algorithms could improve the results.
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A. C. Teodoro, A. C. Teodoro, R. Araújo, R. Araújo, "Exploration of the OBIA methods available in SPRING noncommercial software to UAV data processing", Proc. SPIE 9245, Earth Resources and Environmental Remote Sensing/GIS Applications V, 92451F (10 October 2014); doi: 10.1117/12.2066468; https://doi.org/10.1117/12.2066468

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