Análisis de solución de coordenadas procesadas con diferentes efemérides

Abstract

Georeferencing through GNSS positioning of projects for the administration of natural resources and construction of the territory, supports the planning, design, construction, and monitoring processes. The global satellite navigation system in its abbreviated acronym GNSS, among its various uses, is used to determine the coordinates of geodesic vertices and points of interest. The Agustín Codazzi Geographic Institute classifies the georeferenced vertices as vertices of order 0, order 1, order 2, order 3 and order 4. The project to be carried out consists of the survey of 298 photocontrol points (order 4 according to the IGAC ), for the georeferencing of satellite cartography images at a scale of 1:5000, these points are distributed in the departments of Antioquia, Bolívar, Boyacá, Caquetá, Cauca, Córdoba, Norte De Santander, Tolima, Valle Del Cauca, Arauca, and Putumayo , areas in which there are different weather conditions and public order problems, requiring logistics planning for the capture of GNSS data and its processing in the office. In order to obtain the most accurate post­processing solutions, based on the guidelines requested by the IGAC, where fast ephemeris loading is required, since for this GNSS processing variable it is possible to use transmitted, ultra­fast ephemeris, fast and final, where the first two can be obtained in a period of 2 hours, the third with a wait of 1 to 2 days and the last one between 12 and 18 days after positioning, offering different values of relative positional precision and therefore absolute, opening the doors to a comparative analysis of the precisions, to determine if it is possible to reach the precision values requested by the IGAC, through the use of the different types of ephemeris being calculated by means of commercial processing software.