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Details for Benchmark: KV1493

N 40° 35.667 W 075° 27.617 (NAD 83)

Altitude: 272.6

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

Location:
In LEHIGH county, PA View Original Datasheet
Designation:
RV 1 RDGRR
Marker Type:
rivet
Setting:
light structures
Stability:
Mark of questionable or unknown stability.

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I didn't have any success finding this one. I will have to bone up on my railroad terminology and try again. I would suggest taking some other people along on this one.

Documented History (by the NGS)

01/01/1932 by RDGRR (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1932 AT ALLENTOWN. AT ALLENTOWN, LEHIGH COUNTY, 0.7 MILE SOUTHWEST OF THE READING CO. RAILROAD PASSENGER STATION, AT THE ROUNDHOUSE, 37 YARDS SOUTHWEST OF EAST PENN JUNCTION SIGNAL TOWER, AT CANTILEVER SIGNAL BRIDGE 43, IN THE TOP OF THE NORTHEAST CORNER OF THE CONCRETE BASE, AND NEAR THE CHISELED LETTERS BM. A STANDARD MONEL-METAL RIVET WITHIN A CHISELED SQUARE.
01/01/1932 by CGS (GOOD)
01/01/1960 by CGS (GOOD)
RECOVERY NOTE BY COAST AND GEODETIC SURVEY 1960 RECOVERED IN GOOD CONDITION.
01/01/1987 by LOCSUR (GOOD)
RECOVERY NOTE BY LOCAL SURVEYOR (INDIVIDUAL OR FIRM) 1987 (CT) RECOVERED IN GOOD CONDITION.

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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