Multitemporal analysis of the Upper Rio Guamá Reserve, Paragominas, PA

Abstract

The objective of the research was to verify changes in vegetation cover of part of the Upper Rio Guamá Reserve in Paragominas, Para State, Brazil, through vegetation indexes, aiming at a multitemporal overview of environmental degradation. The images were obtained from INPE databases and the vector bases acquisition from IBGE. Image processing was performed using ENVI 4.7 software, where the bands R5, G4 and B3 were used for the images of 1991 and 2010 and the bands 6R, 5G and 4B for the image of 2016. We also performed re-projection, mask cutting and geometric rectification by control points. The classification of normalized difference vegetation index (NDVI) was made for water, no vegetation, grass, capoeira (early forest regeneration after the abandonment of agricultural practices), secondary forest and dense forest classes, to generate the area indices (ha). . In 25 years there were considerable changes in forest cover, probably due to agriculture expansion and timber extraction activities.