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Details for Benchmark: AA0314

N 24° 42.783 W 081° 05.150 (NAD 83)

Altitude: 0.89

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

Location:
In MONROE county, FL View Original Datasheet
Designation:
T 273
Marker Type:
bench mark disk
Setting:
in rock outcrop
Stability:
Most reliable and expected to hold position/elevation well.

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Documented History (by the NGS)

1/1/1966 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1966 0.5 MI W FROM MARATHON. ABOUT 0.5 MILE WEST ALONG U.S. HIGHWAY 1 FROM THE POST OFFICE AT MARATHON, 54.0 FEET NORTH OF THE CENTER LINE OF THE HIGHWAY, 156 FEET WEST OF THE EXTENDED CENTER LINE OF 43 TH ST., 13 1/2 FEET SOUTHWEST OF A POWER LINE POLE, BETWEEN POLES NOS. 10 AND 11, SET ON THE TOP OF BEDROCK WHICH IS ABOUT LEVEL WITH THE GROUND AND 1 FOOT BELOW THE LEVEL OF THE HIGHWAY.
1/1/1976 by NGS (MARK NOT FOUND)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1976 MARK NOT FOUND.
1/1/1978 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1978 RECOVERED IN GOOD CONDITION.
1/1/1982 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1982 1.5 MILE WEST ON U.S. HIGHWAY 1 FROM POST OFFICE AT MARATHON, 156 FEET WEST OF THE EXTENNED CENTER LINE OF 43RD ST. N. SIDE OF HWY. OPPOSITE ENRICO''S RESTURANT. N. SIDE OF HIGHWAY OPPOSITE ENRICO''S RESTURANT. BETWEEN POWER LINE POLES NO 10 AND 11.
1/1/1988 by USPSQD (MARK NOT FOUND)
RECOVERY NOTE BY US POWER SQUADRON 1988 (EWR) MARK NOT FOUND.

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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