Análisis multitemporal de la cobertura vegetal en la subcuenca del río Chambo.

Abstract

The aim of this study was to conduct a multitemporal analysis of vegetation cover in the Chambo River sub-basin, a study of cover change from 2015 to 2020. Within the studied area, cover was quantified using information from Google Eart Engine, for which the spectral index (NDVI) of the satellite images was calculated. spectral index (NDVI) of the downloaded landsat satellite images. In addition, using Arcgis software, a supervised classification was performed for the identification of coverages, and the transition matrix was also made between 2015 and 2020, in order to analyze the change presented. The results indicate that for the year 2016 showed 0.873 NDVI approaching +1 compared to the other years that showed low values. On the other hand, for 2020 a value of -0.527 approaching -1. Through the supervised classification, changes were evidenced in all types of cover, being the dispersed vegetation with a gain in surface area that for 2015 had 129,080.48 ha (35.96%) and in 2020 with 152,619.419 ha (42.52%). Through the matrix, it was possible to identify the transition from medium vegetation to sparse vegetation with a change of 32,211.4 ha. It is concluded that in the studied area there was a change of 139,397 ha equivalent to 39% and 61% of the vegetation cover remained unchanged 61% of the vegetation cover remained unchanged, equivalent to an area of 219,525.3 ha of the sub-basin. It is recommended to carry out diagnoses in areas of water interest in order to propose actions which involve the protection of natural resources.