CGPS implementation at the Ibiza, Estartit and Barcelona harbours for Coastal Altimetry Juan Jose Martinez-Benjamin 1 , Miquel Angel Ortiz Castellon 3 , Ernest Bosch 3 , Assumpcio Termens 3 , Marina Martinez 1 ,Xavier Martinez de Oses 2 ,Begoña Perez 4 and Francesc Pros 5 (1)Technical University of Catalonia (UPC), Dpt. Geotechnical Engineering and Geosciences, IEEC/CRAE, Institut d’Estudis Espacials de Catalunya/Centre de Recerca de l’Aeronautica i l’Espai, Barcelona, Spain, jj.benjamin@upc.edu (2)Technical University of Catalonia (UPC), Dpt. Nautical Sciences and Engineering, FNB, Barcelona, Spain (3) Institut Cartografic de Catalunya (ICC), Barcelona, Spain (4) Puertos del Estado (PE), Madrid, Spain (5) Port de Barcelona, Spain CGPS implementation at the Ibiza, Estartit and Barcelona harbours for Coastal Altimetry Juan Jose Martinez-Benjamin 1 , Miquel Angel Ortiz Castellon 3 , Ernest Bosch 3 , Assumpcio Termens 3 , Marina Martinez 1 ,Xavier Martinez de Oses 2 ,Begoña Perez 4 and Francesc Pros 5 (1)Technical University of Catalonia (UPC), Dpt. Geotechnical Engineering and Geosciences, IEEC/CRAE, Institut d’Estudis Espacials de Catalunya/Centre de Recerca de l’Aeronautica i l’Espai, Barcelona, Spain, jj.benjamin@upc.edu (2)Technical University of Catalonia (UPC), Dpt. Nautical Sciences and Engineering, FNB, Barcelona, Spain (3) Institut Cartografic de Catalunya (ICC), Barcelona, Spain (4) Puertos del Estado (PE), Madrid, Spain (5) Port de Barcelona, Spain Sea level is an environmental variable which is widely recognised as being important in many scientific disciplines as a control parameter for coastal dynamical processes or climate processes in the coupled atmosphere-ocean systems, as well as engineering applications. Altimeter calibration is essential to obtain an absolute measure of sea level. A major source of sea-level data are the national networks of coastal tide gauges, in Spain belonging to different institutions as the Instituto Geográfico Nacional (IGN), Puertos del Estado (PE),Real Instituto y Observatorio de la Armada (ROA), Instituto Hidrográfico de la Marina (IHM), etc. Three Spanish sites for monitoring sea level are located in Ibiza island, l’Estartit and Barcelona. A description of the actual geodetic CGPS infrastructures at Ibiza, l’Estartit and Barcelona is presented and its applications to sea level monitoring and altimeter calibration. The Ibiza tide gauge belongs to the REDMAR network, composed by stations distributed along the whole Spanish coast, including the Canary islands. The tide gauge also belons to ESEAS (European Sea Level) network. The Estartit floating tide gauge series provides good quality information about the changes in the sea heights at centimetre level, that is the magnitude of the common tides in the Mediterranean, with an accuracy of ±2 mm. Since 1996 it was co-located with geodetic techniques (GPS measurements of XU and XdA levelling data) and it is tied to the SPGIC (Integrated Geodetic Positioning System of Catalonia) project of the Cartographic Institute of Catalonia. From October 2006 to May 2008, the tide gauge was inactive and it has been moved on a new location inside the harbour. In June 2008, new GPS and levelling measures have been done in order to tie the new location into SPGIC project and to co-locate old data respect the new one. Three Begur Cape and one Ibiza Island, with the support of the Real Instituto y Observatorio de la Armada en San Fernando, experiences with GPS buoys/catamaran on Topex Alt-B and Jason-1 radar altimeter calibration and marine geoid mapping were made on 1999, 2000, 2002 and 2003. The Ibiza results, related to Jason-1, agreed relatively well with results obtained at Corsica, Harvest and Bass Strait calibration permanent sites. The main objective of the campaign was 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. A new marine Jason-2 altimeter calibration campaign is envisaged for June 2010/2011. Two LIDAR airborne flights, with a Partenavia P-68 in June 16 and with a Cessna Caravan 2083 in October 12 both is 2007, at the coastal area near l’Estartit harbour were made for evaluation as available technology of possible application of new techniques to sea level determination. The tide gauge of l’Estartit is a traditional floating gauge placed 18 years ago and has an accuracy of ± 2 mm. Since 1996, the l’Estartit tide gauge has been co-located with geodetic techniques (GPS measurements of XU, Utilitary Network, and XdA, Levelling Network,) and it is tied to the SPGIC (Integrated Geodetic Positioning System of Catalonia) project of the Institut Cartogràfic de Catalunya (ICC). In 2006, due to the work for the expansion of the harbour, the tide gauge had to be moved. Before the work started, appropiate GPS measurements were carried out in order to ensure the connection of the tide gauge data. During October 2006 and May 2008, the tide gauge was inactive and it has been moved on to a new location inside the harbour. In June 2008, new GPS and levelling measures have been done in order to tie the new location into SPGIC project and to co-locate old data respect the new one. Although l’Estartit does not have a GPS permanent station, it is possible to build a virtual one from the service “CATNET web” of the ICC. “CATNET web” is a data distribution system of a virtual GPS permanent station via web. From the coordinates where you want to place the virtual station, the time interval and the measurement rate, the system generates a RINEX file under the requested conditions. 1.- Ibiza island and Cape of Begur calibration sites Abstract BARCELONA HARBOUR 3rd Coastal Altimetry Workshop ESRIN, Frascati, Italia 17-18 September , 2009 At Barcelona harbour there are now two tide gauges belonging to Puertos del Estado. One tide gauge, at 2, installed recently, is placed at the dock 140 of the ENAGAS Building.The radar sensor is over the water surface, on a L-shaped structure which elevates it a few meters above the quay shelf. 1-min data are transmitted to the ENAGAS Control Center by cable and then sent each 1 min to Puertos del Estado by e- mail.This sensor also measures agitation and sends wave parameters each 20 min. A provisional tide gauge bench mark has been defined while the levelling is being done. The second Tide Gauge, at 1, is placed at the east end of Alvarez de la Campa Berth, opposite to the Pier for Oil Tankers. It measures inside of a PVC pipe of 300mm of diameter, and it has another pipe of similar calibration and with protection against blows and sun. The memory unit, or LPTM, is inside of a pavilion, and data are sent by radio to the Port Authority Office. The nearest geodesic signal is the NGP 791. The Zero´s situation is with respect the Sea Level Average in Alicante of 2.438m under NGP 791 It is over the foundation that gives support to the nearest bollard, opposite to the southern face of the pavilion. The NGP 792, placed next to the connection between the fences of the CAMPSA tanks and Can Tunis Institute, is taken as stable signal. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Bathymetric campaigns inside the harbour have been made. In the framework of a Spanish Space Project, the instrumentation of sea level measurements is to be improved by providing the Barcelona site with a radar tide gauge, at 3, and with a continuous GPS station nearby. The radar tide gauge is a Datamar 3000C device and a Thales Navigation Internet-Enabled GPS Continuous Geodetic Reference Station (iCGRS) with a choke ring antenna. It is intended that the overall system will constitute a CGPS Station of the ESEAS (European Sea Level) and TIGA (GPS Tide Gauge Benchmark Monitoring) networks. code ; type of data; longitud; latitude; el·lipsoidal height 314094002; XU - ICC20060; 3.2067323; 42.0538927; 50.881 314094002; RTKAT - 2006; 3.2067322; 42.0538928; 50.851 314094003; RTKAT - 2008; 3.2060021; 42.0533614; 50.491 314094064; XU RTKAT - 2006; 3.2063734; 42.0535306; 50.664 314094064; XU RTKDAT - 2008; 3.2063735; 42.0535309; 50.677 At the UPC there is a CGPS, an Astech Internet Enabled Geodetic Reference System iCGRS from Thales Navigation with an Astech choke ring antenna dorne margolin, and a meteorological station DAVIS PRO2 - J.J. Martinez Benjamín, J. Martín Davila, J. Garate Pasquín, Pascal Bonnefond and Ibiza 2003 Team, “Geoid Determination/Jasón-1 Absolute Altimeter Calibration: Ibiza- 2003 Campaign Report”, Boletin ROA, No. 6/2005, Real Instituto y Observatorio de la Armada en San Fernando, Ministerio de Defensa, 72 pp., Diciembre 2005 (ISSN 1131- 5040). - J.J. Martinez-Benjamin, M. Martinez, S. Gonzalez, A. Nuñez, F. Buill, M. Espino, J. Lopez, J. Martin Davila, J. Garate, C. Garcia, P. Bonnefond, O. Laurain, A. Baron, M.A. Ortiz, J. Talaya, B. Perez, E. Alvarez, G. Rodríguez, D. Gomis, M. Marcos, Y. Menard, G. Jan, E. Jeansou, F. Lyard and L. Roblou, “Ibiza Absolute Calibration Experiment: Survey and Preliminary Results, Ed. George Born, Marine Geodesy, Vol 27, pp.-25, Taylor&Francis, Diciembre 2004, (ISSN 0149-0419 print/1521-060X online). A significant contribution has been made related to Topex/Poseidon and Jason-1 calibration campaigns, direct and indirect, in March 1999, August 2000 and July 2002 near Cape of Begur. A Spanish UPC and ROA JASON-1 geoid gradient campaign with ICC and French support has been made in June 2003 at the Ibiza island in the NW Mediterranean Sea. The main objective has been to map with a new designed, builded and calibrated GPS catamaran, the local geoid gradient in three areas around Ibiza island under the ascending (187) and descending (248) Jason-1ground tracks. The main objective has been to establish Ibiza area as a permanent calibration site (Martinez-Benjamin et al., 2004, 2005). GPS TIDE GAUGE