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Details for Benchmark: HT0481

N 37° 41.157 W 122° 28.940 (NAD 83)

Altitude: 404.13

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

Location:
In SAN MATEO county, CA View Original Datasheet
Designation:
L 1241
Marker Type:
bench mark disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Einfach zu finden.

#29

[Photos:]
photoHT0481

Bench mark at the sidewalk in front of the Westmoor High School Sign Post.

[Photos:]
photo033
Westmoor High School Sign Post. Yellow post on left is gate to Westmoor HS.
photo032
HT0481, L1241

Well marked benchmark!

[Photos:]
photoHT0481

You can see this one from the car while driving by.

[Photos:]
photoHT0481 - L1241

Yes, at the curb, at the entrance to the high school parking lot. An easy find; the datasheet description is on the mark. Uh, no pun intended. ;^) Will post a few phone-camera pics. -Batch218-

[Photos:]
photoIn situ
photoMark with GPSr
photoBenchmark

This one is right on the curb as described. When they made the curb cuts for the handicap cutouts they managed to miss the disk by a couple of feet.

Documented History (by the NGS)

01/01/1972 by NGS (MONUMENTED)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1972 AT DALY CITY. AT THE JUNCTION OF EASTMOOR AVENUE AND AN ASPHALT STREET SOUTH TO THE WESTMOOR HIGH SCHOOL PARKING LOT AT DALY CITY, IN THE TOP AND AT THE NORTHEAST CORNER OF A CONCRETE CATCH BASIN AT THE WEST CURB OF THE STREET, 18 FEET SOUTH OF THE SOUTH CURB LINE OF THE AVENUE, 155 FEET WEST OF THE EXTENDED CENTER LINE OF TERRACE VIEW COURT, 255 FEET WEST OF THE EXTENDED CENTER LINE OF GILMAN DRIVE, 0.8 FOOT WEST OF THE WEST CURB OF THE STREET TO THE PARKING LOT, AND ABOUT 1 FOOT HIGHER THAN THE STREET AND AVENUE.
01/01/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 RECOVERED IN GOOD CONDITION.
01/01/1986 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1986 RECOVERED IN GOOD CONDITION. THE DESCRIPTION IS ADEQUATE EXCEPT ADD 7.0 METERS (23.0 FT) EAST-NORTHEAST OF AN IRON ENTRANCE SIGN TO THE SCHOOL, AND 8.5 METERS (28.0 FT) NORTH OF A 15 MPH STREET SIGN.
09/15/1995 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1995 (JDD) THE STATION WAS RECOVERED. TO REACH THE STATION FROM THE INTERSECTION OF INTERSTATE HIGHWAY 280 AND EASTMOOR AVENUE IN DALY CITY, GO WEST ON EASTMOOR AVENUE FOR 0.6 MI (1.0 KM) TO A PAVED SIDE ROAD LEFT, THE ENTRANCE TO WESTMOOR HIGH SCHOOL AND THE STATION ON THE LEFT IN THE SOUTHWEST QUADRANT.

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 June 1991.
  • 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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