The Redefinition of the Geodetic Reference System of Uruguay into SIRGAS Frame

Abstract

In 1908, a systematic geodetic surveys started with cadastral and mapping objetives. Classical operations were carried out along main paralel and meridian chains till 1960’s when the Fundamental Geodetic Network was finished.

A common adjustment using the variation coordinates method was performed in 1963, by the US Army Map Service. The whole 1^st. Order data available was evaluated giving a mean direction error of 0″.71 and 0″.89 misclosure triangle. The data included 15 bases, 12 astronomical stations and 248 geodetic stations. Hayford Ellipsoid was used and the Yacare Datum was established.

After that, normal geodetic densification of the 1^st. Order was performed. The introduction of the EDM in the 1960’s, allowed for electronic polygons, getting field operations faster than classical method.