Transformation parámeters between

Abstract

The officialization of the CR-SIRGAS framework implies the need to transform the information linked to the previous framework to this new national reference. The results of an analysis carried out in the determination of several sets of transformation parameters between the old geodetic frame CR05 and the geodetic frame CR-SIRGAS are presented. This process contemplated the study of the direct transformation between both frameworks contemplating two variants, as well as a sequence of transformations also in two variants considering the ITRF solutions that have occurred since the implementation of CR05. This process called stair transformation considered the impact caused by the Mw 7.6 earthquake in the Nicoya peninsula in August 2012 [1] and [2] on the vertices of the active and passive national geodetic network of CR05. Considering the geometric and physical aspects is essential in an adequate and correct georeferencing. The barycentric transformation model [3] and [4] was used for six parameters: the three translations between the origins and the three rotations of the axes [5]. In each of the calculation processes the residuals in topocentric components [N, E, U] were analyzed. As a result, two sets of six transformation parameters are offered from the national framework CR05, reference time 2005,83, framework ITRF2000 to the national framework CR-SIRGAS, reference period 2014,59, framework ITRF2008. In addition, two sets of six parameters between CR05 and CR-SIRGAS contemplating different ITRF solutions and their respective epochs. In each determination the behavior of the residuals is exposed.