DHLG00USA Site Information Form (site log)
     International GNSS Service
     See Instructions at:
       ftp://igs.org/pub/station/general/sitelog_instr.txt

0.   Form

     Prepared by (full name)  : David Maggert
     Date Prepared            : 2019-04-03
     Report Type              : UPDATE
     If Update:
      Previous Site Log       : dhlg_20151124.log
      Modified/Added Sections : 11


1.   Site Identification of the GNSS Monument

     Site Name                : Durmid Hill
     Four Character ID        : DHLG
     Monument Inscription     : 
     IERS DOMES Number        : 49904M001
     CDP Number               : 
     Monument Description     : Wyatt/Agnew driven-braced
       Height of the Monument : 
       Monument Foundation    : 
       Foundation Depth       : 
     Marker Description       : vertical rod divot
     Date Installed           : 1996-04-24T02:50Z
     Geologic Characteristic  : SEDIMENTARY ROCK
       Bedrock Type           : SANDSTONE/MUDSTONE
       Bedrock Condition      : 
       Fracture Spacing       : 
       Fault zones nearby     : 
         Distance/activity    : 
     Additional Information   : stainless steel 3/4 in. rods driven to refusal 
                              : (24 ft. depth), welded together ~1.5m above 
                              : surface Wyatt-design adaptor, looks like a
                              : SCIGN D3 prototype


2.   Site Location Information

     City or Town             : Durmid Hill
     State or Province        : California
     Country                  : United States
     Tectonic Plate           : NORTH AMERICAN
     Approximate Position (ITRF)
       X coordinate (m)       : -2319099.2600
       Y coordinate (m)       : -4799846.5000
       Z coordinate (m)       : 3490090.4500
       Latitude (N is +)      : +332323.30
       Longitude (E is +)     : -1154716.90
       Elevation (m,ellips.)  : -83.05
     Additional Information   : Imperial County.


3.   GNSS Receiver Information

3.1  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP01378
     Firmware Version         : 1E86-1D01
     Elevation Cutoff Setting : 
     Date Installed           : 1996-04-24T02:50Z
     Date Removed             : 1997-01-23T05:10Z
     Temperature Stabiliz.    : 
     Additional Information   : Initial measurements.

3.2  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP01389
     Firmware Version         : 1E95-1D01
     Elevation Cutoff Setting : 
     Date Installed           : 1997-01-23T05:10Z
     Date Removed             : 1998-03-12T22:00Z
     Temperature Stabiliz.    : 
     Additional Information   : Firmware upgrade, receiver swap

3.3  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP01389
     Firmware Version         : 1F50
     Elevation Cutoff Setting : 
     Date Installed           : 1998-03-12T22:00Z
     Date Removed             : 1998-07-02T22:00Z
     Temperature Stabiliz.    : 
     Additional Information   : Firmware upgrade for MET3 met pack install

3.4  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP03044
     Firmware Version         : 1F50
     Elevation Cutoff Setting : 
     Date Installed           : 1998-07-02T22:00Z
     Date Removed             : 1999-07-14T20:00Z
     Temperature Stabiliz.    : 
     Additional Information   : SCIGN receiver swap, battery backup upgrade . 
                              : ASHTECH LP Z-XII 700845-10F

3.5  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP02790
     Firmware Version         : CC00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 1999-07-14T20:00Z
     Date Removed             : 1999-12-23T23:00Z
     Temperature Stabiliz.    : 
     Additional Information   : Receiver swap for GPS week rollover-compliance.

3.6  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP02767
     Firmware Version         : CC00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 1999-12-23T23:00Z
     Date Removed             : 2004-09-10T22:15Z
     Temperature Stabiliz.    : 
     Additional Information   : Receiver swap due to comm.
                              : problems

3.7  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP02767
     Firmware Version         : CC00
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2004-09-10T22:15Z
     Date Removed             : 2010-10-10T22:27Z
     Temperature Stabiliz.    : 
     Additional Information   : Sampling interval increased to 1Hz (with 
                              : realtime telemetry) and elevation mask set to 

3.8  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP023011
     Firmware Version         : CC00
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2010-10-10T22:27Z
     Date Removed             : 2011-05-04T17:42Z
     Temperature Stabiliz.    : 
     Additional Information   : Ligntning event damaged prior unit.

3.9  Receiver Type            : TPS NET-G3A
     Satellite System         : GPS
     Serial Number            : 618-01037
     Firmware Version         : 3.5 May 06, 2010
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2011-05-04T22:11Z
     Date Removed             : 2013-07-24T23:18Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.10 Receiver Type            : TPS NET-G3A
     Satellite System         : GPS
     Serial Number            : 618-01037
     Firmware Version         : 4.0 Dec,21,2012 p1
     Elevation Cutoff Setting : 5 deg
     Date Installed           : 2013-07-24T23:36Z
     Date Removed             : CCYY-MM-DDThh:mmZ
     Temperature Stabiliz.    : 
     Additional Information   : 

3.x  Receiver Type            : (A20, from rcvr_ant.tab; see instructions)
     Satellite System         : (GPS+GLO+GAL+BDS+QZSS+SBAS)
     Serial Number            : (A20, but note the first A5 is used in SINEX)
     Firmware Version         : (A11)
     Elevation Cutoff Setting : (deg)
     Date Installed           : (CCYY-MM-DDThh:mmZ)
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Temperature Stabiliz.    : (none or tolerance in degrees C)
     Additional Information   : (multiple lines)


4.   GNSS Antenna Information

4.1  Antenna Type             : ASH700936D_M    SNOW
     Serial Number            : CR12656
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.1214
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : SNOW
     Radome Serial Number     : 
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 1996-04-24T02:50Z
     Date Removed             : 2000-04-06T00:00Z
     Additional Information   : Antenna height is measured from the center of 
                              : the hole (referred to above) to the BPA. 
                              : ASHTECH Choke Ring 700936

4.2  Antenna Type             : ASH701945B_M    SCIS
     Serial Number            : CR519991761
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.1224
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : SCIS
     Radome Serial Number     : 
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 2000-04-06T00:00Z
     Date Removed             : 2010-10-10T22:27Z
     Additional Information   : 

4.3  Antenna Type             : ASH701945C_M    SCIS
     Serial Number            : CR520001205
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.1224
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : SCIS
     Radome Serial Number     : 
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 2010-10-10T22:27Z
     Date Removed             : 2012-06-21T22:33Z
     Additional Information   : Prior unit damaged by lightning event.

4.4  Antenna Type             : TPSCR.G3        SCIS
     Serial Number            : 383-1895
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.1224
     Marker->ARP North Ecc(m) : 0.0000
     Marker->ARP East Ecc(m)  : 0.0000
     Alignment from True N    : 0 deg
     Antenna Radome Type      : SCIS
     Radome Serial Number     : 
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 2012-06-21T22:43Z
     Date Removed             : CCYY-MM-DDThh:mmZ
     Additional Information   : 

4.x  Antenna Type             : (A20, from rcvr_ant.tab; see instructions)
     Serial Number            : (A*, but note the first A5 is used in SINEX)
     Antenna Reference Point  : (BPA/BCR/XXX from "antenna.gra"; see instr.)
     Marker->ARP Up Ecc. (m)  : (F8.4)
     Marker->ARP North Ecc(m) : (F8.4)
     Marker->ARP East Ecc(m)  : (F8.4)
     Alignment from True N    : (deg; + is clockwise/east)
     Antenna Radome Type      : (A4 from rcvr_ant.tab; see instructions)
     Radome Serial Number     : 
     Antenna Cable Type       : (vendor & type number)
     Antenna Cable Length     : (m)
     Date Installed           : (CCYY-MM-DDThh:mmZ)
     Date Removed             : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)


5.   Surveyed Local Ties

5.x  Tied Marker Name         : 
     Tied Marker Usage        : (SLR/VLBI/LOCAL CONTROL/FOOTPRINT/etc)
     Tied Marker CDP Number   : (A4)
     Tied Marker DOMES Number : (A9)
     Differential Components from GNSS Marker to the tied monument (ITRS)
       dx (m)                 : (m)
       dy (m)                 : (m)
       dz (m)                 : (m)
     Accuracy (mm)            : (mm)
     Survey method            : (GPS CAMPAIGN/TRILATERATION/TRIANGULATION/etc)
     Date Measured            : (CCYY-MM-DDThh:mmZ)
     Additional Information   : (multiple lines)


6.   Frequency Standard

6.1  Standard Type            : INTERNAL
       Input Frequency        : 
       Effective Dates        : 1996-04-24/CCYY-MM-DD
       Notes                  : 

6.x  Standard Type            : (INTERNAL or EXTERNAL H-MASER/CESIUM/etc)
       Input Frequency        : (if external)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)


7.   Collocation Information

7.x  Instrumentation Type     : (GPS/GLONASS/DORIS/PRARE/SLR/VLBI/TIME/etc)
       Status                 : (PERMANENT/MOBILE)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)


8.   Meteorological Instrumentation

8.1.1  Humidity Sensor Model  : MET3
       Manufacturer           : Paroscientific
       Serial Number          : 69818
       Data Sampling Interval : 600 sec
       Accuracy (% rel h)     : 2
       Aspiration             : 
       Height Diff to Ant     : unknown m
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : 1998-03-12/2012-05-04
       Notes                  : 

8.1.x  Humidity Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy (% rel h)     : (% rel h)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.2.1  Pressure Sensor Model  : MET3
       Manufacturer           : Paroscientific
       Serial Number          : 69818
       Data Sampling Interval : 600 sec
       Accuracy               : 0.5 hPa
       Height Diff to Ant     : unknown m
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : 1998-03-12/2012-05-04
       Notes                  : 

8.2.x  Pressure Sensor Model  : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy               : (hPa)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.3.1  Temp. Sensor Model     : MET3
       Manufacturer           : Paroscientific
       Serial Number          : 69818
       Data Sampling Interval : 600 sec
       Accuracy               : 0.5 deg C
       Aspiration             : 
       Height Diff to Ant     : unknown m
       Calibration date       : 
       Effective Dates        : 1998-03-12/2012-05-04
       Notes                  : 

8.3.x  Temp. Sensor Model     : 
       Manufacturer           : 
       Serial Number          : 
       Data Sampling Interval : (sec)
       Accuracy               : (deg C)
       Aspiration             : (UNASPIRATED/NATURAL/FAN/etc)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.4.x  Water Vapor Radiometer : 
       Manufacturer           : 
       Serial Number          : 
       Distance to Antenna    : (m)
       Height Diff to Ant     : (m)
       Calibration date       : (CCYY-MM-DD)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Notes                  : (multiple lines)

8.5.x  Other Instrumentation  : (multiple lines)


9.   Local Ongoing Conditions Possibly Affecting Computed Position

9.1.x  Radio Interferences    : (TV/CELL PHONE ANTENNA/RADAR/etc)
       Observed Degradations  : (SN RATIO/DATA GAPS/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

9.2.x  Multipath Sources      : (METAL ROOF/DOME/VLBI ANTENNA/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)

9.3.x  Signal Obstructions    : (TREES/BUILDINGS/etc)
       Effective Dates        : (CCYY-MM-DD/CCYY-MM-DD)
       Additional Information : (multiple lines)


10.  Local Episodic Effects Possibly Affecting Data Quality

10.x Date                     : (CCYY-MM-DD/CCYY-MM-DD)
     Event                    : (TREE CLEARING/CONSTRUCTION/etc)

11.  On-Site, Point of Contact Agency Information

     Agency                   : USGS
     Preferred Abbreviation   : USGS
     Mailing Address          : USGS Pasadena Field Office
                              : 525 South Wilson Avenue
                              : Pasadena, CA. 91107
     Primary Contact
       Contact Name           : Ken Hudnut
       Telephone (primary)    : 626-583-7232
       Telephone (secondary)  : 
       Fax                    : 626-583-7827
       E-mail                 : hudnut@usgs.gov
     Secondary Contact
       Contact Name           : Evelyn Roeloffs
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : evelynr@usgs.gov
     Additional Information   : 


12.  Responsible Agency (if different from 11.)

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

13.  More Information

     Primary Data Center      : SIO
     Secondary Data Center    : CDDIS
     URL for More Information : http://www.unavco.org
     Hardcopy on File
       Site Map               : 
       Site Diagram           : 
       Horizon Mask           : 
       Monument Description   : 
       Site Pictures          : 
     Additional Information   : 
     Antenna Graphics with Dimensions

TPSCR.G3

                       +-------+
                     /           \
                    |             |
  +-----------------+-------------+-----------------+     <--  0.1015  TCR
  |                                                 |
  |                                                 |
  |                                                 |
  |                                                 |
+-+-------------------------------------------------+-+
+-------------------+-------------+-------------------+   <--  0.0345  BCR
                    |             |
                    |             |
                    +------x------+                       <--  0.0000  BPA=ARP

                    <--  0.2380 -->
<--                      0.3800                     -->