This section contains references in relation to survey control marks installed and observed by the GPC. The geodetic benchmark information refers to the following observables: Latitude, Longitude, Height above WGS84 ellipsoid, Height above mean sea level and Gravity. The Helmert adjustment parameters for transforming ED50 local topographic bases to ETRS89 are also provided.
Entities and/or individuals are welcomed to contribute towards improving the observables of these signals and thus construct a future common registry that includes all types of geodetic benchmarks independent to the observer and its relative accuracy, as all these may be useful.
Select a municipal district and download the references in PDF format.
The accuracy of observables varies and we therefore recommend a comprehensive reading and careful interpretation of the references.
Other Geodetic Benchmarks in Gipuzkoa:
Government of Basque Country (Note: unrecommended due to changes in altimetry framework (RedNAP08) and ED50 planimetric framework of 1994):
Instituto Geográfico Nacional (National Geographic Institute):
http://www.ign.es/ign/layoutIn/geodesiaVertices.do
