Análisis multitemporal del estado de la vegetación en los municipios Cota, Chía y Cajicá en el tramo de puente Vargas hasta puente de la virgen sobre el área de influencia del río Bogotá a partir de imágenes satelitales

Abstract

The project titled "Multitemporal analysis of the state of vegetation in the Cota, ChÍa and Cajicá municipalities in the vargas bridge section to the virgin bridge over the influence area of the Bogotá river from satellite images" is developed in the Autonomous Corporation Regional of Cundinamarca whose main objective is to verify that the processes of adaptation and hydraulic restoration have been effective in improving the quality of the water and therefore also the state of the vegetation in the area surrounding the Bogotá River. As a baseline, satellite images of the Sentinel 2 satellite were corrected from the study area located in the sabana de Bogotá, specifically in the section puente de la virgen - Puente Vargas, in the middle basin of the Bogotá river. Compositions of bands of natural color, land use, agriculture and infrared were made for the vegetation, in order to identify the coverages present in the study area, the NDVI, GNDVI and SAVI indexes were also applied to recognize the state of the vegetation in the years 2016, 2017 and 2018. Subsequently, spectral signatures were taken with the ERDAS and QGIS software, to evaluate the behavior of the vegetation in 10 points distributed in an area of ​​influence of 10, 20 and 30 meters from the Bogotá river; which were compared to analyze the difference that appears according to the image obtained vs the software used. With the previous procedure it is evident that the vegetation cover has improved over time due to several factors such as the successful completion of the processes of adaptation and hydraulic restoration of the Bogotá river megaproject. The above was verified by comparing the hydrological and hydrobiological sampling points provided by the CAR that indicate that the status of water quality is acceptable for livestock and agricultural activities, however they are contaminated based on the microorganisms that inhabit them. she. Finally, a multitemporal map was made based on the classification supervised by each year in ERDAS, allowing to corroborate with the other analyzes that a progress has been visualized in the state of the vegetation in the Bogotá river round, illustrating that there is a change of coverages that reflect greater land productivity.