NKLG Site Information Form
    International GPS Service for Geodynamics


0.   Form

     Prepared by (full name)  : Pierre Vergez
     Date Prepared            : 30-MAR-1999
     Report Type              : NEW
     Prepared Using           :
 

1.   Site Identification of the GPS Monument

     Site Name                : N'Koltang
     Four Character ID        : NKLG
     Monument Inscription     : None
     IERS DOMES Number        : 32809M002
     CDP Number               : Not assigned
     Date Installed           : 5-FEV-1999 0:00 UT
     Geologic Characteristic  :
       Bedrock Type           :
       Bedrock Condition      :
       Fracture Spacing       :
       Notes                  : (multiple lines)
     Additional Information   : Concrete block / center / 
                              : hemisheric bronze bolt.


2.   Site Location Information

     City or Town             : N'Koltang
     State or Province        : Libreville
     Country                  : Gabon
     Tectonic Plate           : African
     Approximate Position
       X coordinate (m)       : 6287385.7   
       Y coordinate (m)       : 1071574.4
       Z coordinate (m)       : 39132.8    
       Latitude (deg)         : 0.2114 N
       Longitude (deg)        : 9.4019 W
       Elevation (m)          :31.5 m
     Additional Information   : 

3.   GPS Receiver Information

3.1  Receiver Type            : ASHTECH Z18      
     Serial Number            : 83063ZX00115
     Firmware Version         : 7.15 / 3.04        
     Date Installed           : 5-FEV-1999 0:00 UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)


4.   GPS Antenna Information

4.1  Antenna Type             : 701073
     Serial Number            : CRG1998380106
     Antenna Height (m)       : 3.109
     Antenna Reference Point  : Bottom of Flange
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : 5-FEV-1999 0:00 UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : The antenna is set on a metallic pillar
                              : above the mark.


5.   Local Site Ties

5.1  Monument Name            : 
     Site Ref CDP Number      : 
     Site Ref Domes Number    : 
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 : 
       dy (m)                 : 
       dz (m)                 : 
     Accuracy (mm)            : 
     Date Measured            : 
     Additional Information   : 


6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Frequency              : 
       Effective Dates        : 5-FEV-1999 0:00 UT
       Notes                  : 

 7.   Collocation Information
 
 7.1  Instrumentation Type     : Doris Beacon
        Status                 : operational
        Effective Dates        : since january 1988
        Notes                  :
                               :.
 
 7.2  Instrumentation Type     : Doris Beacon
        Status                 : operational
        Effective Dates        : since january 1988
        Notes                  : 
 

8.   Meteorological Instrumentation

8.1  Humidity Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (% rel h)     : (% rel h)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.2  Pressure Sensor Model    :
       Manufacturer           :
       Data Frequency         :
       Accuracy (mbar)        : (mbar)
       Height Diff to GPS (m) : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.3  Temperature Sensor Model :
       Manufacturer           :
       Data Frequency         :
       Accuracy (deg C)       : (deg C)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.4  Water Vapor Radiometer   :
       Manufacturer           :
       Distance to GPS (m)    : (m)
       Elev Diff to GPS (m)   : (m)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

8.5  Other Instrumentation    : (multiple lines)


9.   On-Site, Point of Contact Agency Information

     Agency                   : Institut Geographique National
     Mailing Address          : ENSG / LAREG
                              : 6 et 8 avenue Blaise Pascal
                              : Cite Descartes - Champs-sur-Marne
                              : 77455 Marne la vallee  Cedex 2   FRANCE
     Primary Contact
       Contact Name           : Pascal Willis
       Telephone (primary)    : (33) 1.64.15.32.54
       Fax                    : (33) 1.64.15.32.53
       E-mail                 : willis@ensg.ign.fr
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : none


10.  Responsible Agency (if different from 9.)

     Agency                   :
     Mailing Address          : 
                              : 


11.  More Information

     URL for More Information : http//lareg.ensg.ign.fr/
     Hardcopy on File
       Site Map               : X
       Site Diagram           : X
       Horizon Mask           : X
       Monument Description   : (Y)
       Site Pictures          : (Y)
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions



                                    ---
     L2 Phase Center =>         /    +    \                     <-- 0.128  L2
     L1 Phase Center =>        |     +     |                    <-- 0.110  L1
              +----------------------------------------------+  <-- 0.102  TCR
              |                                              |
              |                                              |
              |                                              |
              |                                              |
             ================================================== <-- 0.035 BCR
                               |           | 
                               |    +-+    |
              +----------------+====| |====+-----------------+  <-- 0.000 ARP
              |     aluminium       | |     plate            |
              +-------| |-----------| |---------------| |----+
                      | |           +-+               | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
                      | |                             | |
          ------------| |------------+----------------| |------- <-- - 3.109
                                   concrete block                        hemisheric bronze bolt
                             


   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering