  Since 1987, Spain has been continuously developing several scientific
projects, mainly based on Earth Sciences, in Geodesy, Geochemistry, Geology or
Volcanology. The need of a geodetic reference frame when doing hydrographic and
topographic mapping meant the organization of the earlier campaigns with the
main goals of updating the existing cartography and of making new maps of the
area. During this period of time, new techniques arose in Space Geodesy
improving the classical methodology and making possible its applications to
other different fields such as tectonic or volcanism. Spanish Antarctic
Geodetic activities from the 1987/1988 to 2006/2007 campaigns are described as
well as a geodetic and a levelling network are presented. The first network,
RGAE, was designed and established to define a reference frame in the region
formed by the South Shetlands Islands, the Bransfield Sea and the Antarctic
Peninsula whereas the second one, REGID, was planned to control the volcanic
activity in Deception Island. Finally, the horizontal and vertical deformation
models are described too, as well as the strategy which has been followed when
computing an experimental geoid.
