Modelamiento geométrico del cambio de coordenadas UTM causadas por mudanza de referencial geodésico: Caso Sirgas - Chile

technological advances in recent decades have allowed determining with increasing precision, parameters related to size, shape and gravitational field of the earth. these new technologies and methods of observation and analysis, accept the use of different geodetic reference systems (grs) that enable the description of position of any point on earth's surface with sub-metric precision. currently in chile there are several sgr used in the generation of cartographic products, such as the provisional south american datum of 1956 (psad56), the south american datum 1969 (sad69) and the new geocentric reference system for the americas (sirgas). the latter, unlike the previous two, is a recent geocentric system with precision and accuracy compatible with modern positioning technologies. currently in chile, the military geographical institute (igm) promotes the adoption of the new system and indicates the model and parameters of transformation to sirgas for national mapping at 1:50,000 scale. with the adoption of sirgas, a significant volume of cartographic documents in use nowadays must be transformed or adapted to the new geodetic reference. there are several methods and models proposed in geodesy to change geodetic coordinate values between different geodetic reference systems. in this paper, a change impact analysis of geodetic reference sirgas in the geometry of the features represented in the universal transverse mercator projection system, in the case of south american continental chile, was realized. subsequently, models and parameters are defined as alternatives to conventional process of coordinate transformation. the results show that alternative models are efficient in the chile case.