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Details for Benchmark: EW1120

N 34° 03.300 W 118° 14.483 (NAD 83)

Altitude: 299.73

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

Location:
In LOS ANGELES county, CA View Original Datasheet
Designation:
J 787
Marker Type:
bench mark disk
Setting:
massive structures
Stability:
Probably hold position/elevation well.

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Recovered in good condition as described.

[Photos:]
photoEarth Owl and mark
photoContext
N 34° 03.297 W 118° 14.472

Recovered in good condition using the detailed description. Markings are clearly legible.

[Photos:]
photoBenchmark J 787 - EW1120 Close-Up at Courthouse

Found it! Fun to come back here to the US District Courthouse, since we had a memorable day out in downtown LA with CDR Niesen when I was in the Navy 15 years ago.

[Photos:]
photoJ 787 EW1120 US Courthouse Downtown LA
photolocation of J 787 EW1120 LA

Recovered in good condition.....

[Photos:]
photoJ 787 (EW1120) disk - Los Angeles, CA
photoJ 787 (EW1120) setting - view looking N
photoJ 787 (EW1120) area - view looking NW

Documented History (by the NGS)

01/01/1946 by CGS (MONUMENTED)
01/01/1955 by NGS (GOOD)
DESCRIBED BY NATIONAL GEODETIC SURVEY 1955 AT LOS ANGELES. AT LOS ANGELES, AT THE POST OFFICE AND U.S. COURTHOUSE, AT THE T JUNCTION OF MAIN AND COMMERCIAL STREETS, AT THE NORTH END OF THE MAIN STREET ENTRANCE, IN THE TOP OF THE NORTHWEST CORNER OF THE NORTH END OF A GRANITE BLOCK OF THE PATIO, 13.3 FEET WEST OF THE WEST EDGE OF THE NORTHERNMOST FLAG POLE, 1.6 FEET EAST OF THE EAST FACE OF THE BUILDING, 1.4 FEET SOUTH OF A BRASS HANDRAIL, AND ABOUT 4 1/2 FEET HIGHER THAN THE STREET.
01/01/1965 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1965 RECOVERED IN GOOD CONDITION.
01/01/1976 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 AT LOS ANGELES, AT THE U.S. COURT HOUSE ON MAIN STREET, IN BETWEEN ALISO STREET AND TEMPLE STREET, AT THE NORTH END OF THE MAIN STREET ENTRANCE TO BUILDING, IN TOP OF THE NORTHWEST CORNER OF THE NORTH END OF A GRANITE BLOCK PATIO, 13.3 FT WEST OF THE NORTHERN MOST FLAG POLE, 1.6 FT EAST OF THE EAST FACE OF THE BUILDING, 1.4 FT SOUTH OF A BRASS HANDRAIL.
01/01/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 AT LOS ANGELES, AT THE U.S. COURT HOUSE ON MAIN STREET, IN BETWEEN ALISO STREET AND TEMPLE STREET, AT THE NORTH END OF THE MAIN STREET ENTRANCE TO BUILDING, IN TOP OF THE NORTHWEST CORNER OF THE NORTH END OF A GRANITE BLOCK PATIO, 13.3 FT. WEST OF NORTHERN MOST FLAG POLE, 1.6 FT. EAST OF THE EAST FACE OF THE BUILDING, 1.4 FT SOUTH OF A BRASS HANDRAIL.
05/19/1989 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1989 RECOVERED IN GOOD CONDITION WITH THE FOLLOWING EXCEPTION, ADD 1.5M(4.9FT) ABOVE MAIN STREET SURFACE.
05/25/1989 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1989 RECOVERED IN GOOD CONDITION.
07/24/1994 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1994 (SDD) IN LOS ANGELES, AT THE INTERSECTION OF MAIN AND ALISO STREETS, NEAR THE NORTHWEST CORNER OF THE GRANITE LANDING OF THE MAIN STREET ENTRANCE OF THE U.S. COURTHOUSE, 81.6 M (267.7 FT) SOUTHWEST OF THE CENTER OF ALISO STREET, 24.5 M (80.4 FT) NORTHWEST OF THE CENTER OF MAIN STREET, 8.3 M (27.2 FT) NORTHEAST OF THE CENTER OF THE MOST NORTHERLY OF 3 ENTRANCE DOORS TO THE BUILDING, 4.0 M (13.1 FT) NORTHWEST OF THE MOST NORTHERLY OF 2 FLAG POLES, 1.5 M (4.9 FT) ABOVE THE LEVEL OF THE MAIN STREET, 0.5 M (1.6 FT) SOUTHEAST OF THE BUILDING, AND 0.4 M (1.3 FT) SOUTHWEST OF A HAND RAIL.

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 1995. WARNING-Repeat measurements at this control monument indicate possible vertical movement.
  • 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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