Análisis sobre obtención de información catastral con imágenes de radar en la vereda Termales del municipio de Vista Hermosa, Meta

Abstract

SAR images can be used in the recognition of targets and land coverages to generate physical information of both individual properties and rural areas as a whole, an aspect in which it is necessary to determine methodologies and materials to increase the efficiency and scope of cadastral work. The project analyzed the usefulness of SAR images for obtaining rural cadastral information, detecting, on the one hand, linear elements whose characteristics make it possible to propose them as candidates to be visible boundaries and, on the other hand, useful information for the elaboration of maps of the variables of rural homogeneous physical zones. The area in which the work was carried out is the Termales district of the Vista Hermosa municipality in the department of Meta, using X and P band images and digital elevation models (DEM) from these bands, products produced between August and July 2007. The detection of visible boundaries was worked by means of visual interpretation and automatic extraction algorithms of linear elements, which produced candidate lines to which the evaluations of quality measures were applied with respect to boundaries of properties obtained by the Tierra en Paz project, which implemented pilots of the FFP methodology in several municipalities of the country since February 2018. Regarding the obtaining of information for the generation of maps of rural ZHF variables, work was done on the variables of homogeneous land areas in the land slope component, following with current land use, influence of roads and availability of permanent surface water. To validate the results, the Shuttle Radar Topography Mission (SRTM) DEM, the 1:100000 scale land covers from 2005 to 2009 produced by the Instituto de Hidrología, Meteorología y Estudios Ambientales (IDEAM) and the information produced by the Instituto Geográfico Agustín Codazzi (IGAC) for the basic cartography at 1:25000 scale were used as references. In general, the work done with the P-band image yielded better results than the work done with the X-band. However, the extraction of linear elements that are candidates to be visible boundaries requires further development given the low quality levels, for which different working materials and adjustments in the parameters of the applied methodology are proposed.