LIBREVILLE DORIS site description form 0. Form Prepared by : SIMB (DORIS installation and maintenance department) Date prepared : 20/06/2008 Report type : UPDATE 1. Site location information Site name : LIBREVILLE Site DOMES number : 32809 Host agency : CNES / STATION ARIANE City : N'Koltang State or province : Country : GABON Tectonic plate : Nubia Geological information : Geographical coordinates (ITRF) : North Latitude : 0 deg 21' 15'' East Longitude : 9 deg 40' 20'' Ellipsoid height : 35 m Approximate altitude : 25 m 2. DORIS antenna and reference point information 2.1 Four character ID : LIBA Antenna model : Alcatel Antenna serial number : IERS DOMES number : 32809S002 CNES/IGN number : 328091 CTDP number : 13 Date installed (dd/mm/yy): 10/01/1988 Date removed (dd/mm/yy) : 04/02/1999 Antenna support type : 1 metre tower Installed on : The side wall of a one storied building Height above ground mark : 3.411 m Ground mark type : Brass mark 20 mm diameter fixed in the basement of : the building. Ground mark DOMES number : 32809M003 Notes : 2.2 Four character ID : LIBB Antenna model : Starec 52290 type Antenna serial number : 44 IERS DOMES number : 32809S003 CNES/IGN number : 328092 CTDP number : 85 Date installed (dd/mm/yy): 07/02/1999 Date removed (dd/mm/yy) : 28/11/2005 Antenna support type : 1 metre tower Installed on : The side wall of a one storied building Height above ground mark : 3.663 m Ground mark type : Brass mark 20 mm diameter fixed in the basement of : the building Ground mark DOMES number : 32809M003 Notes : Upon removal, 2 GHz PC was 2 mm south, 2 mm east : of its initial position (1999) 2.3 Four character ID : LICB Antenna model : Starec 52291 type Antenna serial number : 131 IERS DOMES number : 32809S004 CNES/IGN number : 328093 CTDP number : 255 Date installed (dd/mm/yy): 30/11/2005 Date removed (dd/mm/yy) : Antenna support type : 30 cm sided very rigid metal tower, 2 m high Installed on : 70 cm sided, 40 cm high, 80 cm deep concrete block Height above ground mark : 2.429 m Ground mark type : Domed hexagonal brass mark Ground mark DOMES number : 32809M004 Notes : 3. DORIS beacons information 3.1 Beacon serial number : 86 27 013 Beacon model : 1.0 USO serial number : 1.413 4 Char. ID of the REF point : LIBA Date installed (dd/mm/yy) : 15/06/1990 Date removed (dd/mm/yy) : 20/07/1995 3.2 Beacon serial number : 86 27 010 Beacon model : 1.0 USO serial number : 1.413 4 Char. ID of the REF point : LIBA Date installed (dd/mm/yy) : 06/11/1995 Date removed (dd/mm/yy) : 04/02/1999 3.3 Beacon serial number : 86 27 010 Beacon model : 1.0 USO serial number : 1.413 4 Char. ID of the REF point : LIBB Date installed (dd/mm/yy) : 07/02/1999 Date removed (dd/mm/yy) : 28/11/2005 3.4 Beacon serial number : 28 19 053 Beacon model : 3.0 USO serial number : 3.388 4 Char. ID of the REF point : LICB Date installed (dd/mm/yy) : 29/11/2005 Date removed (dd/mm/yy) : 4. ITRF coordinates and velocities of the current DORIS ref. point (LICB) Solution : ITRF2000 (connection to the NKLG IGS station) Epoch : 1997.0 X = 6287387.733 m Y = 1071576.419 m Z = 39143.272 m Sig X = 0.007 m Sig Y = 0.008 m Sig Z = 0.004 m VX = -0.0076 m/y VY = 0.0138 m/y VZ = 0.0177 m/y Sig VX = 0.0022 m/y Sig VY = 0.0024 m/y Sig VZ = 0.0013 m/y 5. IERS co-location information 5.1 Instrument type : GPS Status : Permanent DOMES number of the instrument ref. point : 32809M002 Notes : 6. Tide gauge co-location information 7. Local site ties 7.1 Point description : DORIS Starec antenna ref point (LIBB), 2005 location DOMES number : 32809S003 Differential components from the current DORIS ref. point (LICB) to the above point (in the ITRS) : dX (m) : 1.102 dY (m) : -2.139 dZ (m) : 3.865 Accuracy (m) : 0.002 Date measured : 11/2005 Additional information : Survey by IGN-F 7.2 Point description : DORIS Alcatel antenna ref point (LIBA) DOMES number : 32809S002 Differential components from the current DORIS ref. point (LICB) to the above point (in the ITRS) : dX (m) : 0.853 dY (m) : -2.191 dZ (m) : 3.866 Accuracy (m) : 0.002 Date measured : 02/1999 Additional information : Survey by IGN-F 7.3 Point description : Mark in concrete block (IGS station NKLG) DOMES number : 32809M002 Differential components from the current DORIS ref. point (LICB) to the above point (in the ITRS) : dX (m) : -1.892 dY (m) : -2.034 dZ (m) : -10.527 Accuracy (m) : 0.001 Date measured : 02/1999 & 11/2005 Additional information : Survey by IGN-F 7.4 Point description : DORIS mark 2 in a concrete block DOMES number : Differential components from the current DORIS ref. point (LICB) to the above point (in the ITRS) : dX (m) : -2.395 dY (m) : -0.408 dZ (m) : -0.015 Accuracy (m) : 0.001 Date measured : 11/2005 Additional information : Survey by IGN-F 7.5 Point description : DORIS mark 1 in the concrete base of the building DOMES number : 32809M003 Differential components from the current DORIS ref. point (LICB) to the above point (in the ITRS) : dX (m) : -2.511 dY (m) : -2.756 dZ (m) : 3.841 Accuracy (m) : 0.002 Date measured : 02/1999 & 11/2005 Additional information : Survey by IGN-F 8. Meteorological Instrumentation 8.1 Humidity sensor Model : HMP45D Manufacturer : VAISALA Accuracy : +/- 3 percents Notes : 8.2 Pressure sensor Model : PTU200 class B Manufacturer : VAISALA Accuracy : +/- 0.25 mb Height : 0.9 m below the current DORIS ref. point (LICB) Notes : long term stability = +/- 0.1 mb/year 8.3 Temperature sensor Model : HMP45D Manufacturer : VAISALA Accuracy : +/- 0.5 deg C Notes : 9. DORIS network contacts Primary contact: Name : Herve FAGARD Agency : Institut Geographique National Mailing address : Service de Geodesie et de Nivellement : 2 Avenue PASTEUR : 94165 SAINT-MANDE CEDEX FRANCE Telephone : + 33 1 43 98 81 48 Fax : + 33 1 43 98 84 50 E-mail : herve (.) fagard (@) ign.fr Secondary contact: Name : Francois BOLDO Agency : Institut Geographique National Mailing address : CNES (DCT/ME/OT) : 18 Avenue Edouard BELIN : 31401 TOULOUSE Cedex FRANCE Telephone : + 33 5 61 27 40 72 Fax : + 33 5 61 28 25 95 E-mail : Simb.Doris@cnes.fr