Message-ID: <3D746FDB.3E075DE2@gfz-potsdam.de> Date: Tue, 03 Sep 2002 10:16:27 +0200 From: Tilo Schoene Organization: GFZ Potsdam, Division 1, Section 1.2 To: igsmail@igscb.jpl.nasa.gov Subject: [IGSMAIL-4067]: TIGA: Data availability Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 03 Sep 01:17:05 PDT 2002 Message Number 4067 ****************************************************************************** Author: Tilo Schoene Dear Colleagues, With this e-mail the TIGA project announces the availability of the first set of reprocessed data products (SINEX files) for the continuous monitoring of GPS points at Tide Gauges (cGPS@TG). The solutions can be accessed through the TIGA WEB page (http://op.gfz-potsdam.de/tiga) or by anonymous access to the FTP server at GFZ Potsdam. As soon as more individual solutions become available a combination solution will be provided. This is expected to happen at the end of 2002. I would like to take this opportunity to shortly review the activities of the TIGA project. It has been awhile since the TIGA Call for Participation (CfP) was issued [IGSMAIL-3370]. The Pilot Project (PP) committee got very positive replies and a good response. By the end of 2001 fifteen proposals were positively reviewed by the PP committee and the IGS Governing Board. Actually TIGA has 16 accepted proposals covering all aspects of TIGA. Just to briefly review the TIGA-CfP, the PP is divided into four main components. TIGA Observing Stations (TOS) are the primary part of the project. A prerequisite for becoming a TOS is the open data policy on GPS, tide gauge and leveling data. The GPS data and additional metadata is stored at the TIGA Data Centers (TDC). We have a good set of centers, which have committed themselves to accept the data with varying latency and on different media. TIGA Analysis Centers (TAC) are divided into three different classes; Type-I centers will not only process data with a very high latency but also reprocess older data. Type-II centers will supplement the high latency processing, while Type-III centers will provide short latency analyses. Consequently TIGA Associate Analysis Centers (TAAC) primarily will analyze the TAC solutions and compare the solutions also with externally estimated vertical motion rates. For more in-depth information see the TIGA home page at http://op.gfz-potsdam.de/tiga/. The first half-year of 2002 was very busy with the establishment of some TIGA components, e.g. the establishment of TDC's, or the setting up the processing chain at the TAC's. While this process is still in progress more solutions will become available. The TAAC's and 'TAC's have discussed the processing strategy and agreed on a minimum of common standards. The most important agreement was on the latency of the TAC-I and TAC-II processing. The accepted 460-day latency allows also the very remote stations in Antarctica to submit their data. The main problem of the TIGA project at the moment is the TOS situation. While about 180 tide gauges exist with a GPS station in less than a few kilometers distance, only 23 stations have been submitted to TIGA. Especially for North and South America, and Asia no station is submitted so far. TIGA is a unique possibility to re-process cGPS@TG data. Moreover this project is a major contribution to the climate change related question about sea level change. I would like to ask you again for you participation and contribution by taking responsibility for TOS stations. If you are in some way responsible for a cGPS station near a tide gauge, or vice versa, a reply would be greatly appreciated. With my best regards Tilo Schoene -- Tilo Schoene GeoForschungsZentrum Potsdam (GFZ), Division 1, Section 1.2 c/o DLR Oberpfaffenhofen, D-82234 Wessling, Germany mailto:tschoene@gfz-potsdam.de Tel: +49-(0)8153-28 1391 http://op.gfz-potsdam.de/ Fax: +49-(0)8153-28 1207