MULTITEMPORAL SEGMENTATION OF SENTINEL-2 IMAGES IN AN AGRICULTURAL INTENSIFICATION REGION IN BRAZIL

Autor(es):Mostrar menos -

Dos Santos, L. T. ; Werner, J. P. S. ; Dos Reis, A. A. ; Toro, A. P. G. ; Antunes, J. F. G. ; Coutinho, A. C. ; Lamparelli, R. A. C. ; Magalhaes, P. S. G. ; Esquerdo, J. C. D. M. ; Figueiredo, G. K. D. A. ; Jiang, J ; Shaker, A ; Zhang, H

• Tipo de documento: Artigo Científico
• Fonte: XXIV ISPRS CONGRESS: IMAGING TODAY, FORESEEING TOMORROW, COMMISSION III; v. 5-3, p. 7-pg., 2022-01-01.

Resumo

With the recent evolution in the sensor's spatial resolution, such as the MultiSpectral Imager (MSI) of the Sentinel-2 mission, the need to use segmentation techniques in satellite images has increased. Although the advantages of image segmentation to delineate agricultural fields in images are already known, the literature shows that it is rarely used to consider temporal changes in highly managed regions with the intensification of agricultural activities. Therefore, this work aimed to evaluate a multitemporal segmentation method based on the coefficient of variation of spectral bands and vegetation indices obtained from Sentinel-2 images, considering two agricultural years (2018-2019 and 2019-2020) in an area with agricultural intensification. Images of the coefficient of variation represented the spectro-temporal dynamics within the study area. These images were also used to apply an edge detection filter (Sobel) to verify their performance. The region-based algorithm Watershed Segmentation (WS) was used in the segmentation process. Subsequently, to assess the quality of the segmentation results produced, the metrics Potential Segmentation Error (PSE), Number-of-Segments Ratio (NSR), and Euclidean Distance 2 (ED2) were calculated from manually delineated reference objects. The segmentation achieved its best performance when applied to the unfiltered coefficient of variation images of spectral bands with an ED2 equal to 7.289 and 2.529 for 2018-2019 and 2019-2020, respectively. There was a tendency for the WS algorithm to produce over-segmentation in the study area; however, its use proved to be effective in identifying objects in a dynamic area with the intensification of agricultural activities. (AU)

• Processo FAPESP: 18/24985-0 - Metodologia para o mapeamento e monitoramento de diferentes sistemas de manejo de pastagens para Pecuária e sistemas mistos de Agricultura-Pecuária com sensoriamento remoto
• Beneficiário: Aliny Aparecida dos Reis
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/50205-9 - Monitoramento de sistemas integrados lavoura-pecuária por meio de sensoriamento remoto e agricultura de precisão para uma produção mais sustentável - rumo à agricultura de baixo carbono
• Beneficiário: Paulo Sergio Graziano Magalhães
• Modalidade de apoio: Auxílio à Pesquisa - Temático