Análise das alterações do uso e cobertura do solo no município de Centenário-RS com auxílio do sensoriamento remoto, no período de 1995-2014

Abstract

The present study aimed to analyze changes in land use and land cover from Landsat images to check the expansion or contraction in the agricultural town of Centenário, RS, in the 1995-2014 period. Three satellite images were used: Landsat 5 TM sensor (Thematic Mapper) for the years 1995 and 2005 and Landsat 8 OLI sensor (Operational Land Imager) for the year 2014. Using the Software QGIS 2.8 was done processing digital images, forming mosaics, georeferencing and supervised digital classification, from the acquisition of samples in the images. They were set three land use classes of the municipality: forestry, agriculture and countryside. For the period surveyed, the results indicate a significant agricultural expansion and consequently decrease the areas of forest and field areas. From 1995 to 2014, agricultural areas increased by 18.25%, as forest areas have a suppression of 15.61% and the field areas a decrease of 2.61%. In this sense, it is emphasized that remote sensing techniques are a useful tool for carrying out studies regarding the use and land cover.