Detection of deforestation in the Amazon forest using NOAA/AVHRR images and the geographic information system SGI: methodology and test of a potential alarm system / Deteccao de desmatamentos na floresta amazonica atraves de imagens AVHRR/NOAA e do sistema de informacoes geograficas SGI: metodologia e teste de um sistema potencial de alerta

AUTOR(ES)
DATA DE PUBLICAÇÃO

1994

RESUMO

The rapid change in the Amazon forest cover has been causing a global concern in association with its impact to the environment. This work describes the results obtained from a low-cost methodology developed to locate new deforestation in the Amazon tropical forest. It combines automatic classification of the Advanced Very High Resolution Radiometer (NOAA/AVHRR) images and a Geographic Information System (GIS). Full resolution and geometrically corrected AVHRR channel 3 (3.5um a 3.9um) images of different dates were automatically compared in digital form. Changes in the original cover of the vegetation are detected in any two different images, and their locations were determined through the GIS. Tests in the northern of the state of Mato Grosso were presented indicating the possibility of using AVHRR imagery operationally to detect new deforestation. Results comparing deforestation in the AVHRR channel 3 with corresponding high resolution Landsat Thematic Mapper (TM) images indicated 49.1% and 56.5% of AVHRR correct location for 216 and 221 polygons of deforestation with different sizes, for two pairs of images, September 1989 and September 1990, and July 1990, and September 1990 respectively. 82% and 90% of correct locations were obtained for the 50 TM polygons with deforestation greater than 3.1km2 for the same pairs of images.

ASSUNTO(S)

imagens landsat warning systems rain forest deforestation infrared imagery change detection desmatamento estudos integrados do meio ambiente radiômetro avançado de resolução muito alta mapeador temático (landsat) satélites noaa geographic information systems (gis) floresta amazônica florestas advanced very high resolution radiometer (avhrr) desflorestamento sistemas de informação geográfica (sgi) metodologia amazônia (região) classificação de imagens image classification

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