Details for Benchmark: OQ0267
N 43° 32.067 W 096° 45.767 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In MINNEHAHA county, SD View Original Datasheet
- SHERMAN RM 1
- Marker Type:
- reference mark disk
- set into the top of a round concrete monument
- May hold, but of type commonly subject to surface motion.
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Documented History (by the NGS)
|01/01/1935 by CGS (MONUMENTED)
|01/01/1949 by NGS (GOOD)
|DESCRIBED BY NATIONAL GEODETIC SURVEY 1949
2.4 MI SW FROM SIOUX FALLS. 1.7 MILES WEST ALONG TWELFTH STREET FROM THE WASHINGTON HIGH SCHOOL AT SIOUX FALLS, THENCE 0.6 MILE SOUTH ALONG KIWANIS AVENUE, THENCE 0.1 MILE WEST ALONG A PARK DRIVE, AT SHERMAN PARK, ON THE EAST BLUFF OF THE BIG SIOUX RIVER, 164.5 FEET EAST OF TRIANGULATION STATION SHERMAN 1935, 118.6 FEET EAST OF A FLAGPOLE ON TOP OF THE MOST WESTERLY INDIAN MOUND (MOST WESTERLY ONE OF FOUR INDIAN MOUNDS LOCATE ON TOP OF A HILL), 14.0 FEET SOUTH OF THE CENTER LINE OF A PARK DRIVE ALONG THE NORTH SIDE OF THE INDIAN MOUNDS, AND SET IN THE TOP OF A CONCRETE POST WHICH IS FLUSH WITH THE SURFACE OF THE GROUND. NOTE-- THE NEW ROAD CONSTRUCTION HAS PROBABLY DESTROYED THE POST.
|01/01/1962 by USGS (MARK NOT FOUND)
|RECOVERY NOTE BY US GEOLOGICAL SURVEY 1962
MARK NOT FOUND.
|05/25/1990 by NGS (GOOD)
|RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1990
0.3 KM (0.2 MI) NORTHWESTERLY ALONG A PARK ROAD FROM ITS JUNCTION WITH 22ND STREET AND KIWANIS AVENUE IN SIOUX FALLS, IN SHERMAN PARK, BETWEEN THE SECOND AND THIRD INDIAN BURIAL MOUNDS, 50.1 M (164.4 FT) EAST OF THE CGS TRIANGULATION STATION SHERMAN, 36.1 M (118.4 FT) EAST OF A FLAG POLE ON TOP OF THE MOST WESTERLY 1 OF 4 INDIAN BURIAL MOUNDS, 34.5 M (113.2 FT) WEST OF A HISTORICAL SIGN, 4.3 M (14.1 FT) SOUTH OF AND LEVEL WITH THE CENTER OF THE ROAD ALONG THE NORTH SIDE OF THE MOUNDS, AND IN TOP OF A CONCRETE MONUMENT THAT IS FLUSH WITH THE GROUND SURFACE.
- 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.