Mapeamento do uso e ocupação do solo da microbacia hidrográfica do Riacho Timbaúbas em Juazeiro do Norte-CE utilizando SIG

Mapping of land use and occupation in the Timbaúbas stream's microwatershed in Juazeiro do Norte-CE using GIS

Abstract

The present paper was developed in the hydrographic basin in which the Parque Timbaúbas, an area defined as a Conservation Unit of Integral Protection inside the city of Juazeiro do Norte-CE, is inserted; and aimed to map the different land use and occupation, contributing to the analysis of precipitation in macro-drainage scale. To delimit the watershed, the Haster Shuttle Radar Topography Mission (SRTM) image with a spatial resolution of 30 m, obtained by the Earth Explore United States Geological Survey (USGS) website was used. In the mapping of land use and occupation, the CBERS 4th satellite image was used, obtained from the website of the National Institute for Space Research (INPE). The mapping defined 7 classes of land use and occupation, in the following proportions of the total area: impermeable areas with 29.55%, water with 0.16%, high vegetation with 13.47%, common land with 19.97%, pastures with 21.23%, cultivated areas with 2.86% and exposed soil with 12.76%. To validate the analysis, the error matrix was obtained, the value of the Kappa coefficient of 0.84, which indicates excellent performance, global accuracy of 87.59%, producer and user accuracy. Although there were certain inconsistencies in the pixel assignments, the classification performed satisfactorily.