Subject: [IGSMAIL-1713] DHLG Site Log Update
From: Chris Roelle
Date: Tue, 28 Oct 1997 20:19:20 PST

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IGS Electronic Mail      Tue Oct 28 20:19:20 PST 1997      Message Number 1713
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Author: Chris Roelle
Subject: DHLG Site Log Update

Subject: DHLG Site Log Update

The log file for the GPS site at
Durmid Hill, California, USA (DHLG)
has been updated to accurately
reflect the elevation of the monument.
The log is available for ftp at 
lox.ucsd.edu://pub/docs/site_logs/dhlg.log
and is included in this message.
We regret any inconvenience this
inaccuracy caused.

Regards,
Chris Roelle

     DHLG Site Information Form
     International GPS Service for Geodynamics

0.   Form

     Prepared by (full name)  : Chris Roelle
     Date Prepared            : 17-OCT-1997
     Report Type              : UPDATE
     Prepared Using           :

1.   Site Identification of the GPS Monument

     Site Name                : Durmid Hill PGGA
     Four Character ID        : DHLG
     Monument Inscription     : None
     IERS DOMES Number        : (XXXXXXXXX)
     CDP Number               : Not yet available
     Date Installed           : 24-APR-1996 02:50 UT
     Geologic Characteristic  : SEDIMENTARY ROCK
       Bedrock Type           : SANDSTONE/MUDSTONE
       Bedrock Condition      : (FRESH/JOINTED/WEATHERED)
       Fracture Spacing       : (1-10 cm/10-50 cm/50-200 cm/over 200 cm)
       Notes                  : (multiple lines)
     Additional Information   : Monument type - Driven Rod Quincunx
                              : Stainless steel 3/4" rods driven to refusal (at
                              : ~24'depth) and welded together approximately
                              : 1.5 m above ground surface. The station mark is
                              : a hole drilled into the side of the vertical
                              : stainless steel rod, between the rod weld point
                              : and the antenna adaptor.
                              : Station is colocated with the south end vault
                              : of the Durmid Hill Laser strainmeter operated
                              : by Frank Wyatt and Duncan Agnew, IGPP, SIO.
                              : Information on the Quincunx monument and the
                              : Durmid Hill strainmeter are located on the
                              : web at http://www-pfo.ucsd.edu

2.   Site Location Information

     City or Town             : Durmid Hill
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : North American/Pacific Plate Boundary
     Approximate Position
       X coordinate (m)       : -2319120.7869
       Y coordinate (m)       : -4799881.2570
       Z coordinate (m)       :  3490071.5368
       Latitude (deg)         :  33.2129 N
       Longitude (deg)        : 115.7881 W
       Elevation (m)          : -59.5061
     Additional Information   : Coordinates taken from Rinex file header,
                              : converted to WGS84

3.   GPS Receiver Information

3.1  Receiver Type            : ASHTECH LP Z-XII 700845-10D
     Serial Number            : LP 01378
     Firmware Version         : 1E86-1D01
     Date Installed           : 24-APR-1996 02:50 UT
     Date Removed             : 23-JAN-1997 05:00 UT
     Additional Information   : (multiple lines)

3.2  Receiver Type            : ASHTECH LP Z-XII 700845-10D
     Serial Number            : LP 01389
     Firmware Version         : 1E95-1D01
     Date Installed           : 23-JAN-1997 05:10 UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : Firmware upgrade, receiver swap

3.x  Receiver Type            :
     Serial Number            :
     Firmware Version         :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

4.   GPS Antenna Information

4.1  Antenna Type             : ASHTECH Choke Ring 700936
     Serial Number            : 12656
     Antenna Height (m)       : 0.1214
     Antenna Reference Point  : ARP
     Degree Offset from North : Antenna Alligned to True N
     Antenna Radome Type      : ASHTECH Choke Ring Radome
     Date Installed           : 24-APR-1996 02:50 UT
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

4.x  Antenna Type             :
     Serial Number            :
     Antenna Height (m)       : (m)
     Antenna Reference Point  : (ARP/BCR/BPA)
     Degree Offset from North :
     Antenna Radome Type      :
     Date Installed           : (dd-MMM-yyyy hh:mm UT)
     Date Removed             : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

5.   Local Site Ties

5.x  Monument Name            :
     Site Ref CDP Number      : (XXXX)
     Site Ref Domes Number    : (XXXXXXXXX)
     Differential Components from GPS Mark to Site Reference (ITRS)
       dx (m)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (m)
     Accuracy (mm)            : (mm)
     Date Measured            : (dd-MMM-yyyy hh:mm UT)
     Additional Information   : (multiple lines)

6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Frequency              :
       Effective Dates        : 24-APR-1996 - dd-MMM-yyyy
       Notes                  : (multiple lines)

6.x  Standard Type            : (H-MASER/CESIUM/QUARTZ/INTERNAL/RUBIDIUM)
       Frequency              :
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

7.   Collocation Information

7.x  Instrumentation Type     : (DORIS/GLONASS/PRARE/SLR/VLBI)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (dd-MMM-yyyy - dd-MMM-yyyy)
       Notes                  : (multiple lines)

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                   : SOPAC, Scripps Institution of Oceanography
     Mailing Address          : IGPP, MS 0225
                              : UC, San Diego
                              : 9500 Gilman Drive
                              : La Jolla, CA 92093
     Primary Contact
       Contact Name           : Jeff Dean
       Telephone (primary)    : 619-534-8487
       Telephone (secondary)  : 619-534-7692
       Fax                    : 619-534-9873
       E-mail                 : [email-masked]
     Secondary Contact
       Contact Name           : Frank Wyatt/Duncan Agnew
       Telephone (primary)    : 619-534-2411
       Telephone (secondary)  : 619-534-0229
       Fax                    : 619-534-9873
       E-mail                 : [email-masked]
     Additional Information   : (multiple lines)

10.  Responsible Agency (if different from 9.)

     Agency                   : (multiple lines)
     Mailing Address          : (multiple lines)
     Primary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Secondary Contact
       Contact Name           :
       Telephone (primary)    :
       Telephone (secondary)  :
       Fax                    :
       E-mail                 :
     Additional Information   : (multiple lines)

11.  More Information

     URL for More Information :
     Hardcopy on File
       Site Map               : (N)
       Site Diagram           : (N)
       Horizon Mask           : (N)
       Monument Description   : (N)
       Site Pictures          : (N)
     Additional Information   : (multiple lines)
     Antenna Graphics with Dimensions

     ASHTECH w/DORNE MARGOLIN Choke Ring (& Radome)

                         -----
                     /     +     \                        <-- 0.128  L2
                    |      +      |                       <-- 0.110  L1
  +--------------------------------------------------+    <-- 0.102  TCR
  |                                                  |
  |                                                  |
  |                                                  |
  |                                                  |
+-+--------------------------------------------------+-+  <-- 0.038  BCR
+-------------------+-------------+--------------------+  <-- 0.035  BGP
                    |             |
                   =|             |
                    +------x------+                       <-- 0.000  ARP

<--                      0.381                       -->

     NOTE: Dimensions and Offsets Presumed to be same
           as for TURBOROGUE DM-T (tests pending)

   ARP: Antenna Reference Point
   L1 : L1 Phase Center                   L2 : L2 Phase Center
   TCR: Top of Chokering                  BCR: Bottom of Chokering
   TGP: Top of Ground Plane               BGP: Bottom of Ground Plane

[Mailed From: Geodesy Lab account <[email-masked]>]