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Details for Benchmark: HT2271

N 37° 43.767 W 122° 28.483 (NAD 83)

Altitude: 208.73

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

Location:
In SAN FRANCISCO county, CA View Original Datasheet
Designation:
M 6 C OF SF
Marker Type:
survey disk
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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Based upon cybercacher's coords, this one is gone. There's relatively new concrete at the coordinates; looks like SBC did some work here. Will post a couple of images. -Batch218-

[Photos:]
photoGPSr at the location
photoNew concrete; SBC (now AT&T) has been busy
N 37° 43.803 W 122° 28.499

There is no painted white cross or steps nearby. The benchmark is a small disk stamped M 6 1974, set in the sidewalk of 19th Ave, and is in good condition.

[This entry was edited by cybercacher on Saturday, February 19, 2005 at 4:13:34 PM.]

Documented History (by the NGS)

01/01/1974 by CA3290 (MONUMENTED)
01/01/1977 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1977 IN SAN FRANCISCO. AT SAN FRANCISCO, ON 19 TH AVE AT STONETOWN MALL, A DISK SET IN THE SIDEWALK IN THE CENTER OF A PAINTED WHITE CROSS, 10 FEET SOUTH OF THE STEPS LEADING TO THE MALL AT THE NORTH END, AND 5 FEET WEST OF THE WEST CURB OF 19 TH AVE.

Control Text

  • The horizontal coordinates were scaled from a topographic map and have an estimated accuracy of +/- 6 seconds.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • 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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