Utilização de imagens SRTM na obtenção de dados altimétricos para o município de São João do Sabugi - RN

Abstract

The analysis of morphometric characteristics such as area, perimeter, slope, altitude, drainage density, among others, are fundamental in the development of environmental studies. The physical and biotic characteristics of a given location play an important role in decisionmaking. In this sense, the development and improvement of techniques together with geotechnologies for morphometric characterization have been the subject of study in several parts of the world, and promote relevant results. In view of the above, the present study aimed to perform the morphometric characterization of the municipality of São João do Sabugi - RN, using data from the ALOS PALSAR Satellite, integrated and processed in a GIS environment. The spatial data obtained were subjected to pre-processing techniques, such as reprojection of its coordinate reference system to UTM (24s time zone) and of its geodetic system to SIRGAS 2000, as well as exclusion of its spurious pixels. These procedures allowed the obtaining of accurate morphometric parameters. The results showed that morphometric characterization, through the processing of Digital Elevation Model (DEM) data in a Geographic Information System (GIS) environment, offers significant advantages in terms of cost-benefit. The methodology applied proved to be adequate and easy to use. The slope of the municipality is predominantly undulating to strongly undulating. The conception of the results achieved in this study allows a consistent understanding of the morphometric behavior of the municipality of São João do Sabugi - RN, which can be used for adequate environmental planning.