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

0.   Form

     Prepared by (full name)  : Aris Gust Aspiotes
     Date Prepared            : 2024-04-09
     Report Type              : UPDATE
     If Update:
      Previous Site Log       : sgdm_20220328.log
      Modified/Added Sections :  


1.   Site Identification of the GNSS Monument

     Site Name                : San Gabriel Dam
     Four Character ID        : SGDM
     Monument Inscription     : 
     IERS DOMES Number        : 49911M003
     CDP Number               : 
     Monument Description     : Wyatt/Agnew drilled-braced
       Height of the Monument : 
       Monument Foundation    : 
       Foundation Depth       : 
     Marker Description       : drilled hole in top of center support bolt on
                              : scign d3 antenna adaptor
     Date Installed           : 1999-11-02T00:00Z
     Geologic Characteristic  : 
       Bedrock Type           : 
       Bedrock Condition      : 
       Fracture Spacing       : 
       Fault zones nearby     : 
         Distance/activity    : 
     Additional Information   : A secondary measurement, the adaptor/divot
                              : distance, taken from the bottom of the lower
                              : adaptor plate to the center of a divot drill-
                              : mark on the north-facing tripod leg, is .1016m.


2.   Site Location Information

     City or Town             : Azusa
     State or Province        : California
     Country                  : USA
     Tectonic Plate           : Pacific
     Approximate Position (ITRF)
       X coordinate (m)       : -2467931.8933
       Y coordinate (m)       : -4668655.8241
       Z coordinate (m)       : 3565569.8063
       Latitude (N is +)      : +341220.26
       Longitude (E is +)     : -1175142.13
       Elevation (m,ellips.)  : 420.7174
     Additional Information   : Los Angeles County. Reference frame used is
                              : ITRF2000. Coordinate system used is WGS84.


3.   GNSS Receiver Information

3.1  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP03005
     Firmware Version         : CC00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 1999-11-02T00:00Z
     Date Removed             : 2001-01-26T00:00Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.2  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP03005
     Firmware Version         : CC00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 2001-01-26T00:00Z
     Date Removed             : 2001-05-18T00:00Z
     Temperature Stabiliz.    : 
     Additional Information   : Configuration Change: Sampling interval
                              : decreased to 60 seconds...no telemetry to site.

3.3  Receiver Type            : ASHTECH Z-XII3
     Satellite System         : GPS
     Serial Number            : LP03005
     Firmware Version         : CC00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 2001-05-18T00:00Z
     Date Removed             : 2003-07-31T18:21Z
     Temperature Stabiliz.    : 
     Additional Information   : Configuration Change: Sampling interval
                              : increased to 30 seconds...but still no telemetry
                              : to site.

3.4  Receiver Type            : ASHTECH UZ-12
     Satellite System         : GPS
     Serial Number            : UC1200303009
     Firmware Version         : CN00
     Elevation Cutoff Setting : 10 deg
     Date Installed           : 2003-07-31T18:21Z
     Date Removed             : 2007-11-06T00:00Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.5  Receiver Type            : ASHTECH UZ-12
     Satellite System         : GPS
     Serial Number            : ZR520022310
     Firmware Version         : CJ00
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2007-11-06T00:00Z
     Date Removed             : 2008-01-07T17:25Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.6  Receiver Type            : ASHTECH UZ-12
     Satellite System         : GPS
     Serial Number            : UC1200303010
     Firmware Version         : CN00
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2008-01-07T17:25Z
     Date Removed             : 2009-10-22T19:07Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.7  Receiver Type            : TRIMBLE NETRS
     Satellite System         : GPS
     Serial Number            : 4927175310
     Firmware Version         : 1.2-5 22OCT2007
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2009-10-22T19:26Z
     Date Removed             : 2016-05-25T18:50Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.8  Receiver Type            : TRIMBLE NETRS
     Satellite System         : GPS
     Serial Number            : 4927175310
     Firmware Version         : 1.3-2 30OCT2016
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2016-05-25T19:00Z
     Date Removed             : 2022-03-25T19:12Z
     Temperature Stabiliz.    : 
     Additional Information   : 

3.9  Receiver Type            : SEPT POLARX5
     Satellite System         : GPS+GLO+GAL+SBAS
     Serial Number            : 3052299
     Firmware Version         : 5.4.0
     Elevation Cutoff Setting : 0 deg
     Date Installed           : 2022-03-25T20:12Z
     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             : ASH701945B_M    SCIT
     Serial Number            : CR519991822
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.0083
     Marker->ARP North Ecc(m) : 0
     Marker->ARP East Ecc(m)  : 0
     Alignment from True N    : 
     Antenna Radome Type      : SCIT
     Radome Serial Number     : 0052
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 1999-11-02T00:00Z
     Date Removed             : 2022-03-25T19:12Z
     Additional Information   : Antenna height was corrected from 0.083 on
                              : 07/22/2003. Antenna epoch overlaps with CACT.
                              : This is the correct S/N for the antenna removed
                              : on 2022-03-25.

4.2  Antenna Type             : TWIVC6150       SCIT
     Serial Number            : VC6150L1910310011
     Antenna Reference Point  : BPA
     Marker->ARP Up Ecc. (m)  : 0.0083
     Marker->ARP North Ecc(m) : 0
     Marker->ARP East Ecc(m)  : 0
     Alignment from True N    : 
     Antenna Radome Type      : SCIT
     Radome Serial Number     : 4035
     Antenna Cable Type       : 
     Antenna Cable Length     : 
     Date Installed           : 2022-03-25T20:12Z
     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.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.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.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.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 Southern California Geodetic Network
     Preferred Abbreviation   : SCGN
     Mailing Address          : 525 South Wilson Avenue. Pasadena, CA 91106
     Primary Contact
       Contact Name           : USGS SCGN Operators
       Telephone (primary)    : 650-329-4677
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : scgn-operators@usgs.gov
     Secondary Contact
       Contact Name           : 
       Telephone (primary)    : 
       Telephone (secondary)  : 
       Fax                    : 
       E-mail                 : 
     Additional Information   : (multiple lines)

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   : (multiple lines)

13.  More Information

     Primary Data Center      : UNAVCO
     Secondary Data Center    : 
     URL for More Information : https://www.unavco.org
     Hardcopy on File
       Site Map               : (Y or URL)
       Site Diagram           : (Y or URL)
       Horizon Mask           : (Y or URL)
       Monument Description   : (Y or URL)
       Site Pictures          : (Y or URL)
     Additional Information   : 
     Antenna Graphics with Dimensions

     https://files.igs.org/pub/station/general/antenna.gra