Details for Benchmark: AE2558
N 41° 33.254 W 088° 01.511 (NAD 83)
Coordinates may not be exact. Altitude is GPS OBS and location is ADJUSTED. (more info)
- In WILL county, IL View Original Datasheet
- WILL COUNTY GPS 436
- Marker Type:
- NGS Benchmark
- setting not listed - see description
- Most reliable and expected to hold position/elevation well.
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Documented History (by the NGS)
|01/01/1997 by ASCPC (MONUMENTED)
|DESCRIBED BY AMERICAN SURVEYING CONSULTANTS PC 1997 (PS)
FROM INTERSECTION OF IL ROUTE 6 AND FARROH ROAD, NORTH 0.5 MILES (0.8 KM) TO ROSALIND AVE. STATION IN NORTHWEST QUADRANT T INTERSECTION STATION IS FLUSH WITH SURFACE AND IS STAINLESS ROD WITH SLEEVE WITH CAST CAP AND LID
- The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in October 1999.
- The orthometric height was determined by GPS observations and a high-resolution geoid model.
- 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.