HOLC Site Information Form (site log) International GPS Service See Instructions at: https://ftp.igs.org/pub/station/general/sitelog_instr.txt 0. Form Prepared by (full name) : Susan Jeffries Date Prepared : 2022-04-05 Report Type : UPDATE If Update: Previous Site Log : holc_20080513.log Modified/Added Sections : (n.n,n.n,...) 1. Site Identification of the GNSS Monument Site Name : Holcomb Ridge Four Character ID : HOLC Monument Inscription : IERS DOMES Number : 40404M101 CDP Number : Monument Description : shallow rod/braced antenna mount Height of the Monument : (m) Monument Foundation : (STEEL RODS/CONCRETE BLOCK/ROOF/etc) Foundation Depth : (m) Marker Description : OTHER Date Installed : 1994-08-12 Geologic Characteristic : BEDROCK Bedrock Type : METAMORPHIC (MARBLE) Bedrock Condition : JOINTED Fracture Spacing : 1-10 cm Fault zones nearby : (YES/NO/Name of the zone) Distance/activity : (multiple lines) Additional Information : 3/4" diameter, stainless steel rod with : removable brass adaptor atop vertical rod. Hard : limestone foundation, 4 10-12 foot stainless : steel rods - one vertical, three oblique, welded : above surface. Vertical datum is a filed notch : in the vertical rod. Legs are isolated from : shallow rock and soil by PVC in the uppermost : ~5'. Antenna housing is Kearney- Powerglass : fiberglass (rounded rectangular shape). Antenna : is mounted low to the ground. SCIGN - Southern : California Integrated GPS Network. This station : was decommissioned on 14-AUG-2007. 2. Site Location Information City or Town : Pearblossom State or Province : California Country : USA Tectonic Plate : Pacific Approximate Position (ITRF) X coordinate (m) : -2459518.2212 Y coordinate (m) : -4655992.0708 Z coordinate (m) : 3589168.8673 Latitude (N is +) : +342729.47 Longitude (E is +) : -1175042.58 Elevation (m,ellips.) : 1238.1529 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 : 03377 Firmware Version : NAV 1D00 CHN 1C01 Elevation Cutoff Setting : 0 deg Date Installed : 1994-08-12T00:00Z Date Removed : 1995-04-15T00:00Z Temperature Stabiliz. : Additional Information : First measurements 3.2 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : 460 Firmware Version : 1D00 Elevation Cutoff Setting : 0 deg Date Installed : 1995-04-15T00:00Z Date Removed : 1995-05-15T00:00Z Temperature Stabiliz. : Additional Information : PJ: added this entry to DB based on rinex not in : pre-DB log file 3.3 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : 04368 Firmware Version : NAV 1E24 CHN 1C70 Elevation Cutoff Setting : 0 deg Date Installed : 1995-05-15T00:00Z Date Removed : 1996-09-24T00:00Z Temperature Stabiliz. : Additional Information : exchanged Loaner #1 for USGS rec/ant unit 3.4 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : 04368 Firmware Version : NAV 1E95 1D01 Elevation Cutoff Setting : 0 deg Date Installed : 1996-09-24T00:00Z Date Removed : 1998-08-14T00:00Z Temperature Stabiliz. : Additional Information : ASHTECH Z-XII3 3.5 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP03008 Firmware Version : 1F50 Elevation Cutoff Setting : 0 deg Date Installed : 1998-08-14T00:00Z Date Removed : 1998-12-30T00:00Z Temperature Stabiliz. : Additional Information : Previous receiver locked up after lightning : strike 3.6 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP02896 Firmware Version : CB00 Elevation Cutoff Setting : 0 deg Date Installed : 1998-12-30T00:00Z Date Removed : 1999-06-22T18:00Z Temperature Stabiliz. : Additional Information : Previous receiver produced incomplete files 3.7 Receiver Type : ASHTECH Z-XII3 Satellite System : GPS Serial Number : LP02896 Firmware Version : CC00 Elevation Cutoff Setting : 10 deg Date Installed : 1999-06-22T18:00Z Date Removed : 2007-08-14T00:00Z Temperature Stabiliz. : Additional Information : Firmware upgrade for GPS week : rollover-compliance. This station was : decommissioned on 14-AUG-2007. 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 : ASH700718B NONE Serial Number : 10293 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0876 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 1994-08-12T00:00Z Date Removed : 1995-05-15T00:00Z Additional Information : field measurement 10.35 cm to base of wide part 4.2 Antenna Type : ASH700718B NONE Serial Number : 10485 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0870 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 1995-05-15T00:00Z Date Removed : 1995-05-26T00:00Z Additional Information : field measurement 10.30 cm to base of wide part : of antenna base reduced by 1.6 cm correction (to : base of narrow part) exchanged Loaner #1 for : USGS rec/ant unit 4.3 Antenna Type : ASH700936A_M NONE Serial Number : 11477 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0850 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 1995-05-26T00:00Z Date Removed : 1999-12-08T00:00Z Additional Information : same filed notch used as vertical datum. DM type : antenna installed old LGP antenna 4.4 Antenna Type : ASH700936E_C NONE Serial Number : CR14570 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0825 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 1999-12-08T00:00Z Date Removed : 2001-02-21T00:00Z Additional Information : old antenna removed due to slow failure-- : possible lightning strike damage weeks earlier. 4.5 Antenna Type : ASH701945B_M NONE Serial Number : CR519991924 Antenna Reference Point : BPA Marker->ARP Up Ecc. (m) : 0.0850 Marker->ARP North Ecc(m) : 0 Marker->ARP East Ecc(m) : 0 Alignment from True N : deg Antenna Radome Type : NONE Radome Serial Number : Antenna Cable Type : (vendor & type number) Antenna Cable Length : (m) Date Installed : 2001-02-21T00:00Z Date Removed : 2007-08-14T00:00Z Additional Information : Gray antenna removed and upgraded with new SCIGN : cast antenna. This station was decommissioned on : 14-AUG-2007. 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 : 1994-08-12/CCYY-MM-DD Notes : (multiple lines) 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 7.1 Instrumentation Type : NONE Status : (PERMANENT/MOBILE) Effective Dates : (CCYY-MM-DDThh:mmZ) Notes : (multiple lines) 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 Preferred Abbreviation : USGS Mailing Address : USGS Pasadena Field Office : 525 South Wilson Avenue : : Pasadena CA USA 91107 Primary Contact Contact Name : SCGN Operators Telephone (primary) : 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 Boulder Facility Archive Secondary Data Center : Scripps Orbit and Permanent Array 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 : (multiple lines) Antenna Graphics with Dimensions ASH701945B_M ASH701945C_M ASH701945D_M ASH701945E_M +-------+ / + \ <-- 0.1280 L2 | + | <-- 0.1100 L1 +-----------------+-------------+------------------+ <-- 0.1006 TCR | | | | | | | | +-+--------------------------------------------------+-+ <-- 0.0376 +-------------------+-------------+--------------------+ <-- 0.0346 BCR | | | | +------x------+ <-- 0.0000 BPA=ARP <-- 0.3794 --> 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 TPA: Top of Preamplifier BPA: Bottom of Preamplifier TOP: Top of Pole