Estimación de la Subsidencia de la Ciudad de Bogotá Mediante Imágenes de Radar y Técnicas de Inteferometria Diferencial DinSar

Abstract

Bogotá currently has more than 7,500,000 habitants and is the most crowded city in Colombia, reason for which an excess in the exploitation of natural resources is generated mainly in the extraction of underground water made in the Sabana de Bogotá, which has caused subsidence throughout its length. Thus, this project aims to support subsidence studies in order to reduce atmospheric effects and to obtain large-scale results both spatially and temporally, for which a multitemporal analysis was made with Synthetic Aperture Radar images (SAR) obtained from the Sentinel satellite in Single Look Complex format (SLC) with the advantage of capturing useful information regardless of the weather conditions in the study area, in addition to being generated both day and night since the source of energy is not the sun. Also DInSAR interferometry techniques were applied, where the images were corrected by taking into account the exact information of the orbits and the incidence angles of each of the images; after this the interferograms were generated from where the elimination of the phase by the topography is carried out, and then the unrolling of the phase was realized, in order to obtain the absolute values of the vertical movements of the topographic surface in the metric units. The results obtained seek to provide a solid basis for evaluating the effect of the subsidence phenomenon in the planning of the territory, in order to carry out tactics that allow a focus on the urban geographic spaces.