Mapeamento da evolução do uso e ocupação do solo com recurso ao geoprocessamento, caso de estudo: Distrito de Boane

Abstract

Knowledge of the land use and occupation of a given area is essential because the information acquired from it contributes to the management of the territory and the development of the environment. Mapping is a method frequently adopted to highlight patterns of land use and occupation. The main objective of this work is to map the evolution of land use and occupation using geoprocessing tools in the district of Boane. To achieve this objective, in a first phase, the study area of ​​Boane district was selected and then images were obtained from the Landsat 5 TM and Landsat 8 OLI sensors, with a spatial resolution of 30 meters and a temporal resolution of 16 days, with dates June 6, 2001, April 9, 2011 for Landsat 5 TM and May 29, 2021 for Landsat 8 OLI, totaling three images. The images were pre-processed and supervised by the maximum likelihood algorithm using QGIS 3.28.2 software. The Kappa index was used to validate the classification, which resulted in 0.81395 (Excellent), 0.86342 (Excellent) and 0.88022 (Excellent) accuracy for the images from 2001, 2011 and 2021 respectively, meaning that more than 80% of the pixels were classified correctly. The classification results showed good accuracy in relation to reality, demonstrating good efficiency in the use of geoprocessing technologies in the collection and processing of spatial information.(TRADUÇÃO NOSSA)