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  • Preliminary results of the 2013 Ibiza calibration campaign of Jason 2 and Saral altimeters

     Frappart, Frédéric; Martinez Benjamin, Juan Jose; Gracia Gomez, Carlos; Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Valles Casanova, I. Berenguer; Gili Ripoll, Jose Antonio
    IEEE International Geoscience and Remote Sensing Symposium
    p. 4473-4476
    DOI: 10.1109/IGARSS.2014.6947485
    Presentation's date: 2014-07
    Presentation of work at congresses

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    This study presents the preliminary results of the 2013 Ibiza calibration campaign of Jason-2 and Saral altimeters. It took place from 14 to 16 September 2013 and was composed of two phases: the calibration of the GNSS buoys to estimate the antenna height of each of them and absolute calibration to estimate the altimeter bias (i.e., the difference of sea level measured by radar altimetry and GNSS). The first one was achieved in the Ibiza harbor at a close vicinity of the Ibiza tide gauge and the second one was at ~ 40 km at the northwest of Ibiza Island at a crossover point of Jason-2 and Saral nominal groundtracks. Five buoys were used to delineate the crossover region and their measurements interpolated at the exact location of each overflight. The overflights occurred two consecutive days: 15 and 16 September 2013 for Jason-2 and Saral respectively. Absolute biases of 0.1 and -4 cm were found for Jason-2 and Saral respectively.

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    Geodetic infrastructure in the Ibiza and Barcelona harbours for sea level monitoring  Open access

     Martinez Benjamin, Juan Jose; Gili Ripoll, Jose Antonio; Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Pérez Gómez, Begoña; Gracia Gomez, Carlos; Pros Llavador, Francesc; Palau Teixidó, Vicenç
    American Geophysical Union Fall Meeting
    p. 1
    Presentation's date: 2013-12
    Presentation of work at congresses

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    The presentation is directed to the description of the actual situation and relevant information of the geodetic infrastructure of Ibiza and Barcelona sites for sea level determination and contribution to regional sea level rise. Time series are being analysed for mean sea level variations www.puertos.es. .In the framework of a Spanish Space Project, the instrumentation of sea level measurements has been improved by providing the Barcelona site with a radar tide gauge Datamar 2000C from Geonica s.l. near an acoustic tide gauge. Puertos del Estado installed in 2007 a MIROS radar tide gauge and the Barcelona Harbour Authority a GPS referente station in the roof of the new Control Tower situated in the Energy Pier. 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. There is a GPS station Leica Geosystems GRX1200 GG Pro and antenna 1202. Precision levelling has been made several times in the last two years because the tower is founded in reclaimed land. The measured settlement rate is about 1cm/year that may be could mask the values registered by the tide gauge. A description of the actual infrastructure at Ibiza harbour at Marina de Botafoch, is presented and its applications to sea level monitoring and altimeter calibration in support of the main CGPS at Ibiza harbour. It is described the geometrical precision levelling made in June 2013 between the radar tide gauge and the GPS station. In particular, the CGPS located at Ibiza harbour is essential for its application to the marine campaign Baleares 2013, near Ibiza island. The main objective is to determine the altimeter bias for Jason-2, about 9:09 UTC September 15, 2013, and Saral/AltiKa, about 05:30 UTC September 16, UTC. These activities has been received funding of the Ministerio de Ciencia e Innovacion under Spanish National Project CGL2009-13435/CLI.

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    Baleares 2013 Calibration Campaign for Jason-2 and Saral/AltiKa  Open access

     Martinez Benjamin, Juan Jose; Biancale, Richard; Martin Davila, José; Gárate Pasquín, Jorge; Pérez Gómez, Begoña; Gili Ripoll, Jose Antonio; Lopez Bravo, Rogelio; Tapia Gomez, Ana Maria; Gracia Gomez, Carlos; Frappart, Frédéric; Roussel, Nicolas
    Ocean Surface Topography Science Team Meeting
    p. 1
    Presentation's date: 2013-10
    Presentation of work at congresses

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    A Baleares calibration campaign in Spanish-French cooperation is being prepared for mid September 2013 for the altimeters of Jason-2 and Saral/AltiKa in the Ibiza island area. A similar Spanish/French experience with Jason-1 was made in June 2003 in this geographical area under IBIZA 2003 campaign. In this local/regional campaign focusing in bias, we foresee to calibrate the altimeter of Jason-2 and Saral satellites by means of GPS buoys. 4 buoys will be used near a node from Jason-2 (September 15 about 9:38 in ascending track) and Saral (September 15 about 7:30 in ascending track) satellites to get the slope of the sea in along track and cross track directions, what is necessary to interpolate the exact nadir point of the satellite. It will be used Argos floating transmitters from CLS to be tied to the buoys with a long rope. We have thought over different configurations. The crossover point between Jason-2 and Saral North of Ibiza (around 40 nm) and West of Mallorca island seems to be optimal in order to have a comparable layout of buoys at the same place for both satellites, of couse at one day interval. This would allow moreover cross calibration between Jason2 and Saral. The GPS receivers will be at 1Hz. It will be used the CGPS at Ibiza harbour from Puertos del Estado. A description of the actual geodetic infrastructure of Ibiza site will be presented. This campaign Baleares 2013 is founded from the Ministerio de Ciencia e Innovacion of Spain under National Project I+D+i ref:CGL2009-13435/CLI.

  • Implementation of marine altimeter calibration campaign in the area of Ibiza island

     Martinez Benjamin, Juan Jose; Lopez Bravo, Rogelio; Pérez Gómez, Begoña; Gili Ripoll, Jose Antonio; Tapia Gomez, Ana Maria; Gonzalez Gonzalez, Juan Carlos; Sanz Conde, M. Mercedes; Gracia Gomez, Carlos
    European Space Agency Living Planet Symposium
    p. 1-4
    Presentation's date: 2013
    Presentation of work at congresses

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    The presentation is directed mainly to the description of the actual situation of the Ibiza site in preparation for a new altimeter calibration marine campaign of Jason-2 and Sara/AltiKa satellites to be made in september 2013. A description of the two geometric levelling campaigns made in June and September 2013 is included