MAHE DORIS site description form 0. Form Prepared by : SIMB (DORIS installation and maintenance department) Date prepared : 13/09/2013 Report type : UPDATE 1. Site location information Site name : MAHE Site DOMES number : 39801 Host agency : Seychelles National Meteorological Services City : Pointe Larue State or province : Mahe Island Country : SEYCHELLES Tectonic plate : AFRC Geological information : Geographical coordinates (ITRF) : North Latitude : -4 deg 40' 44'' East Longitude : 55 deg 31' 50'' Ellipsoid height : -36 m Approximate altitude : 4 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 DORIS SSALTO number : 218 Date installed (dd/mm/yy): 20/06/2001 Date removed (dd/mm/yy) : 07/12/2012 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 : 2.2 Four character ID : MAIB Antenna model : Starec 52291 type Antenna serial number : 91 IERS DOMES number : 39801S006 CNES/IGN number : 398012 DORIS SSALTO number : 336 Date installed (dd/mm/yy): 07/12/2012 Date removed (dd/mm/yy) : Antenna support type : Stainless steel structure 40cm high Installed on : concrete pillar 1.5 m high Height above ground mark : 0.829 m Ground mark type : Hexagonal domed brass Ground mark DOMES number : 39801M005 Notes : 3. DORIS beacons information 3.1 Beacon serial number : 8633052 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 : 2819010 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 : 2819004 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 : 2819059 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) : 30/03/2009 3.5 Beacon serial number : 3690079 Beacon model : 3.0 USO serial number : 3.496 4 Char. ID of the REF point : MAHB Date installed (dd/mm/yy) : 30/03/2009 Date removed (dd/mm/yy) : 27/10/2011 3.6 Beacon serial number : 1000001 Beacon model : 3.2 USO serial number : 3.197 4 Char. ID of the REF point : MAHB Date installed (dd/mm/yy) : 27/10/2011 Date removed (dd/mm/yy) : 07/12/2012 3.7 Beacon serial number : 1000001 Beacon model : 3.2 USO serial number : 3.197 4 Char. ID of the REF point : MAIB Date installed (dd/mm/yy) : 07/12/2012 Date removed (dd/mm/yy) : 4. ITRF coordinates and velocities of the current DORIS ref. point (MAIB) Solution : ITRF2008 Epoch : 2005.0 X = 3597847.792 m Y = 5240876.363 m Z = -516790.797 m Sig X = 0.002 m Sig Y = 0.002 m Sig Z = 0.001 m VX = -0.0245 m/y VY = 0.0105 m/y VZ = 0.0127 m/y Sig VX = 0.0009 m/y Sig VY = 0.0008 m/y Sig VZ = 0.0005 m/y 5. IERS colocation information 5.1 Instrument type : GNSS Status : Permanent DOMES number of the instrument ref. point : 39801M004 Notes : Permanent GNSS station REGINA (SEYG) 6. Tide Gauge colocation information 6.1 Name : Pointe La Rue Location : Pointe La Rue GLOSS number : 339 Distance : 304 m Notes : Tie measured 12/2012 7. Local site ties 7.1 Point description : DORIS starec antenna reference point (MAHB) DOMES number : 39801S005 Differential components from the current DORIS ref. point (MAIB) to the above point (in the ITRS) : dX (m) : -33.391 dY (m) : 23.393 dZ (m) : -0.515 Accuracy (m) : 0.001 Date measured : 06/12/2012 Additional information : Survey by IGN-F 2012 7.2 Point description : Mark under the DORIS antenna DOMES number : 39801M005 Differential components from the current DORIS ref. point (MAIB) to the above point (in the ITRS) : dX (m) : -0.468 dY (m) : -0.681 dZ (m) : 0.068 Accuracy (m) : 0.001 Date measured : 06/12/2012 Additional information : Survey by IGN-F 2012 7.3 Point description : Permanent GNSS station REGINA (SEYG) DOMES number : 39801M004 Differential components from the current DORIS ref. point (MAIB) to the above point (in the ITRS) : dX (m) : -11.583 dY (m) : 7.539 dZ (m) : 9.666 Accuracy (m) : 0.001 Date measured : 06/12/2012 Additional information : Survey by IGN-F 2012 7.4 Point description : Stainless steel domed mark on concrete block DOMES number : 39801M002 Differential components from the current DORIS ref. point (MAIB) to the above point (in the ITRS) : dX (m) : -34.755 dY (m) : 21.404 dZ (m) : -0.320 Accuracy (m) : 0.001 Date measured : 06/12/2012 Additional information : Survey by IGN-F 2012 7.5 Point description : Tide gauge benchmark UH2 (GLOSS 339) DOMES number : 39801M003 Differential components from the current DORIS ref. point (MAIB) to the above point (in the ITRS) : dX (m) : 119.811 dY (m) : -57.680 dZ (m) : 273.268 Accuracy (m) : 0.001 Date measured : 06/12/2012 Additional information : Survey by IGN-F 2012 8. Meteorological Instrumentation 8.1 Humidity sensor Model : Manufacturer : Accuracy : Notes : No humidity sensor (3.2 configuration) 8.2 Pressure sensor Model : PTB210B Manufacturer : VAISALA Accuracy : +/- 0.20 mb Height : m below the current DORIS ref. point (MAIB) Notes : long term stability = +/- 0.1 mb/year 8.3 Temperature sensor Model : Manufacturer : Accuracy : Notes : No temperature sensor (3.2 configuration) 9. DORIS network contacts Primary contact: Name : Jerome SAUNIER Agency : Institut Geographique National Mailing address : Service de Geodesie et Nivellement : 73 avenue de Paris : 94165 SAINT-MANDE Cedex FRANCE Telephone : + 33 1 43 98 83 63 Fax : + 33 1 43 98 84 50 E-mail : jerome (.) saunier (@) ign.fr Secondary contact: Name : Francois BOLDO Agency : Institut Geographique National Mailing address : CNES (DCT/ME/OC) : 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