1. SEA SURFACE DETERMINATION EXPERIENCES IN THE IBIZA ISLAND Juan Jose Martinez-Benjamin 1, Jose Martín Davila 4, Jorge Garate 4, Pascal Bonnefond 5, Marina Martinez Garcia 1, Miquel Angel Ortiz Castellon 2, Gema Rodriguez Velasco 3, Begoña Perez 6 and the IBIZA2003 Team 1. Technical University of Catalonia (UPC), Dpt. Geotechnical Engineering andd Geosciences, Barcelona, Spain, jj.benjamin@upc.edu 2. Cartographic Institute of Catalonia (ICC), Barcelona, Spain 3. Universidad Complutense de Madrid (UCM), Spain 4. Real Instituto y Observatorio de la Armada en San Fernando (ROA), Cadiz, Spain 5. Observatoire de la Côte d’Azur (OCA/GEMINI) Grasse, France 6. Puertos del Estado (PE), Madrid, Spain IBIZA2003 TEAM: Cristina Garcia, Julia Talaya, Anna Baron, Enrique Alvarez, Sergio Gonzalez, Amparo Nuñez, Felipe Buill, Jaime Lopez-Marco, Manuel Espino, Damia Gomis, Marta Marcos, Yves Menard, Florent Lyard, Olivier Laurain, Gwenaele Jan, Eric Jeansou, Laurent Roblou

2. World Altimeter Calibration Sites

3. GPS TIDE GAUGE IBIZA LEVELLING Final heights of Ibiza tide gauge - GPS in Ibiza Nautical Club itinerary Point Height (m) Tide gauge Ibiza 0,0000 Geopoint NGZ426 0,8942  0.001 GPS antenna (base) 10,2566  0.001 GPS antenna (south corner on top) 10,1452  0.001 Antenna CGCCT Corner base GPS Corner buildin ng Antena base 0,405m

4. GPS Catamaran – IBIZA Campaign The main objective of the marine campaign is to check the value of Ibiza Island as a permanent calibration site in the western Mediterranean Sea, to complement the Corsica site in the network of altimeter calibration sites.

5. Mean Sea Surface mapping The Ocean model MOG2D is a barotropic, time-stepping, non-linear model, derived from Lynch and Gray developed at the LEGOS/OMP, Toulouse, France. Mog2d finite element’s grid in the Ibiza region. Maximum spatial resolutions~ 3 km. Scale colors represents the bathymetry depth (m). Contour Map of the gridded GPS sea surface heights. Dashed lines represent the Jason-1 passes: ascending N°187 (SW – NE) and descending N°248 (NW – SE).