Título:	Multitemporal segmentation of Sentinel-2 images in an agricultural intensification region in Brazil.
Autoria:	SANTOS, L. T. dos WERNER, J. P. S. REIS, A. A. dos TORO, A. P. G. ANTUNES, J. F. G. COUTINHO, A. C. LAMPARELLI, R. A. C. MAGALHÃES, P. S. G. ESQUERDO, J. C. D. M. FIGUEIREDO, G. K. D. A.
Afiliação:	FEAGRI/UNICAMP; FEAGRI/UNICAMP; UNICAMP; FEAGRI/UNICAMP; JOAO FRANCISCO GONCALVES ANTUNES, CNPTIA; ALEXANDRE CAMARGO COUTINHO, CNPTIA; UNICAMP; UNICAMP; JULIO CESAR DALLA MORA ESQUERDO, CNPTIA, FEAGRI/UNICAMP; FEAGRI/UNICAMP.
Ano de publicação:	2022
Referência:	ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, v. V-3-2022, p. 389-395, 2022.
Conteúdo:	ABSTRACT: 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.
NAL Thesaurus:	Vegetation index
Palavras-chave:	Coeficiente de variação Índice de vegetação Segmentação de bacias hidrográficas Detecção de bordas Intensificação agrícola Coefficient of variation OBIA Watershed segmentation Edge detection Sobel AssesSeg
Digital Object Identifier:	https://doi.org/10.5194/isprs-annals-V-3-2022-389-2022
Notas:	Edition of proceedings of the 2022 edition of the XXIVth ISPRS Congress, Nice, France.
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CNPTIA)