MAHE DORIS site description form 0. Form Prepared by : SIMB (DORIS installation and maintenance department) Date prepared : 26/07/2007 Report type : UPDATE 1. Site location information Site name : MAHE Site DOMES number : 39801 Host agency : Meteorological Services City : Pointe Larue State or province : Mahe Island Country : SEYCHELLES Tectonic plate : Somalia Geological information : Geographical coordinates (ITRF) : North Latitude : -4 deg 40' 44'' East Longitude : 55 deg 31' 51'' Ellipsoid height : -36 m Approximate altitude : 3 m 2. DORIS antenna and reference point information 2.1 Four character ID : MAHB Antenna model : Starec 52291 type Antenna serial number : 91 IERS DOMES number : 39801S005 CNES/IGN number : 398011 CTDP number : 218 Date installed (dd/mm/yy): 20/06/2001 Date removed (dd/mm/yy) : Antenna support type : 32 cm sided, 2 m high triangular steel tower Installed on : 1 m sided, 1.3 m deep and 0.2 m high concrete : block. Height above ground mark : 2.422 m Ground mark type : 12 mm stainless steel domed mark Ground mark DOMES number : 39801M002 Notes : 3. DORIS beacons information 3.1 Beacon serial number : 86 33 052 Beacon model : 1.0 USO serial number : 1.685 4 Char. ID of the REF point : MAHB Date installed (dd/mm/yy) : 20/06/2001 Date removed (dd/mm/yy) : 08/07/2002 3.2 Beacon serial number : 28 19 010 Beacon model : 3.0 USO serial number : 3.226 4 Char. ID of the REF point : MAHB Date installed (dd/mm/yy) : 08/07/2002 Date removed (dd/mm/yy) : 18/08/2004 3.3 Beacon serial number : 28 19 004 Beacon model : 3.0 USO serial number : 3.260 4 Char. ID of the REF point : MAHB Date installed (dd/mm/yy) : 05/11/2004 Date removed (dd/mm/yy) : 24/06/2005 3.4 Beacon serial number : 28 19 059 Beacon model : 3.0 USO serial number : 3.389 4 Char. ID of the REF point : MAHB Date installed (dd/mm/yy) : 23/12/2005 Date removed (dd/mm/yy) : 4. ITRF coordinates and velocities of the current DORIS ref. point (MAHB) Solution : ITRF2000 (connection to the IGS station SEY1) Epoch : 1997.0 X = 3597814.603 m Y = 5240899.667 m Z = -516791.418 m Sig X = 0.02 m Sig Y = 0.02 m Sig Z = 0.02 m VX = -0.0206 m/y VY = 0.0248 m/y VZ = 0.0131 m/y Sig VX = 0.0035 m/y Sig VY = 0.0044 m/y Sig VZ = 0.0009 m/y 5. IERS co-location information 5.1 Instrument type : GPS Status : Permanent DOMES number of the instrument ref. point : 39801M001 Notes : 6. Tide gauge co-location information 6.1 Name : Pointe Larue Location : Pointe Larue GLOSS number : 273 Distance : 324 m Notes : Tie measured 06/2001 7. Local site ties 7.1 Point description : Brass mark under the DORIS antenna DOMES number : 39801M002 Differential components from the current DORIS ref. point (MAHB) to the above point (in the ITRS) : dX (m) : -1.366 dY (m) : -1.990 dZ (m) : 0.198 Accuracy (m) : 0.001 Date measured : June 2001 Additional information : Survey by IGN-F 7.2 Point description : Tide gauge bench mark UH2 DOMES number : 39801M003 Differential components from the current DORIS ref. point (MAHB) to the above point (in the ITRS) : dX (m) : 153.176 dY (m) : -81.036 dZ (m) : 273.729 Accuracy (m) : 0.002 Date measured : June 2001 Additional information : Survey by IGN-F 7.3 Point description : GPS Monument JPL 4016-S (IGS station SEY1) DOMES number : 39801M001 Differential components from the current DORIS ref. point (MAHB) to the above point (in the ITRS) : dX (m) : 5056.127 dY (m) : -2725.387 dZ (m) : 515.911 Accuracy (m) : 0.02 Date measured : June 2001 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 : the current DORIS ref. point (MAHB) 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/PO/AL) : 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