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