Avaliação da altitude e da declividade em diferentes modelos digitais de elevação

Abstract

The study and analysis of watersheds are important for the exploration and planning of the resources found within them. The present work aimed to compare two Global Elevation Digital Models, the SRTM and the Copernicus DEM. The comparison between the MDEs becomes relevant due to the fact that they are two global MDS where there is a time interval in which data were collected for both, with the SRTM data collected in the year 2000 and the Copernicus DEM data collected in the period from 2010 to 2015. The study area chosen for this work is the watershed of theTaquari-Miracatu stream, which is located in the west of the state of Rio Grande do Sul. This research used the morphometric analysis method using QGIS as an instrument to analyze the differences in slopes and altitudes that the MDEs present for this area. The study also relied on land use and land cover data to analyzeinterferences and discrepancies in the information presented by the MDEs. After analyzing the study area for the two Digital Elevation Models, it can be seen that the Copernicus DEm presented higher altitudes where eucalyptus was planted in the time interval of the collection carried out from one MDE to the other. With this, the research demonstrated an interesting methodology to analyze the altitude and slope data between different MDEs.