Cartographic delimitation of diffuse springs with the use of remote sensing in Várzea Grande – MT

Abstract

Many cities have been developed rapidly along the rivers, like the city of Várzea Grande – MT. However, the inordinate urbanization generates issues on the supply and quality of the water, in view of occupancy of sites that execute a function of guarding the bodies of water, such as the Areas of Permanent Preservation. (APP) and humid areas (AU). In this way, the identification of areas with great environment services, such as the diffuse springs, treated here as (AU), are an important instrument to guide the development of the cities and preserve the ecosystem of great environment value. Therefore, the purpose of this study is to cartographically delimitate the diffuse springs cataloged by the “Water for the future” in the Urban and Peri-urban zones of Várzea Grande and its respective APPs, using the NDWI, MNDWI and DWV remote sensing technics. The results show that the spectral indicators have demonstrated a good efficiency to delimitate the bodies of water in the study site, however, they were not capable to delimitated the diffuse springs. From those results, is denoted that is necessary to insert others technics of remote sensing to the spectral indicators, that can be able to distinguish the spectral results of humid areas to others coverages and ground usages.