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Details for Benchmark: AF9887

N 33° 12.983 W 116° 27.063 (NAD 83)

Altitude: 3128.34

Coordinates may not be exact. Altitude is ADJUSTED and location is ADJUSTED. (more info)

Location:
In SAN DIEGO county, CA View Original Datasheet
Designation:
SDPR 16
Marker Type:
survey disk
Setting:
in a boulder
Stability:
May hold, but of type commonly subject to surface motion.

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Benchmarking day with Mikey. & found KING, HOPE, BAKER, DON, YAP, SY12, SY64, SDPR17, SDPR16, SDPR15, SDPR14, SDPR13, CL25.

Benchmarking day found KING, HOPE, BAKER, DON, YAP, SY12, SY64, SDPR17, SDPR16, SDPR15, SDPR14, SDPR13, CL25

[Photos:]
photoAF9887 Benchmark

Quick and easy find, used jefj42 coordinates.
The Fossillady

[Photos:]
photoAF9887
N 33° 12.981 W 116° 27.064

Easy to find. Very close to listed coordinates.

[Photos:]
photoAF9887
photoView looking NW

On the side of the road

Practicly drove right over it

Documented History (by the NGS)

01/01/1995 by CADT (MONUMENTED)
DESCRIBED BY CALTRANS 1995 (ATD) THE STATION IS LOCATED 4.2 MI (6.8 KM) EAST OF RANCHITA, 5.0 MI (8.0 KM) SOUTHWEST OF BORREGO SPRINGS ON THE WEST SIDE OF SAN DIEGO COUNTY ROUTE S-22 AT POST MILE 9.9. TO REACH THE FROM THE TRAFFIC CIRCLE IN BORREGO SPRINGS, KNOWN LOCALLY AS CHRISTMAS CIRCLE, GO WEST ON SAN DIEGO COUNTY RTE. S-22, PALM CANYON ROAD, FOR 1.4 MI (2.3 KM) TO THE INTERSECTION OF HOBERG RD HEADING NORTH AND MONTEZUMA VALLEY RD HEADING SOUTH. TURN LEFT, AND GO SOUTH THEN SOUTHWEST 5.1 MI (8.2 KM) TO A VIEWPOINT AND STONE MONUMENT IN A TURNOUT ON THE LEFT, WEST. CONTINUE STRAIGHT AHEAD 2.6 MI (4.2 KM) TO A POINT ABOUT 500 FT (152.4 M) SOUTHEAST OF THE WESTERLY END OF A PASSING LANE AND THE STATION ON THE LEFT, WEST. THE STATION MARK IS IN A LOW BOULDER 88.3 FT (26.9 M) WEST OF A DO NOT PASS SIGN ON THE EAST SHOULDER, 43 FT (13.1 M) WEST OF THE WEST SHOULDER OF THE ROAD, 34.5 FT (10.5 M) SOUTHWEST OF THE WEST END OF AN 18 IN METAL PIPE, 3 FT (0.9 M) NORTH OF A 5 FT (1.5 M) HIGH BOUDER, 5.3 FT (1.6 M) ABOVE THE WEST SHOULDER OF THE ROAD. THE STATION WAS LEVELED TO BY CADT AS A PART OF THE 1995 PERIPHERAL RUN IN SAN DIEGO COUNTY TO ESTABLISH NAVD 1988. OCCUPIED BY GPS RECEIVER AS PART OF SAN DIEGO VERTICAL GPS SURVEY.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in July 1998. The horizontal coordinates are valid at the epoch date displayed above. The epoch date for horizontal control is a decimal equivalence of Year/Month/Day.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in May 2000.
  • The X, Y, and Z were computed from the position and the ellipsoidal ht.
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The ellipsoidal height was determined by GPS observations and is referenced to NAD 83.
  • The geoid height was determined by GEOID99.
  • The dynamic height is computed by dividing the NAVD 88 geopotential number by the normal gravity value computed on the Geodetic Reference System of 1980 (GRS 80) ellipsoid at 45 degrees latitude (G = 980.6199 gals.).
  • The modeled gravity was interpolated from observed gravity values.

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