Details for Benchmark: LY1227
N 41° 22.650 W 075° 07.817 (NAD 83)
Coordinates may not be exact. Altitude is ADJUSTED and location is SCALED. (more info)
- In PIKE county, PA View Original Datasheet
- M 235
- Marker Type:
- bench mark disk
- in a boulder
- May hold, but of type commonly subject to surface motion.
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||Zhanna found LY1227
N 41° 22.641 W 075° 07.824
On this chilly Sunday, Rich and I decided to continue our search for marks in the 235 series in Pike County. This was our first stop. Though the historic description of this mark contained some inaccuracies, the mark was still easy to find. It is marked by an old ring of yellow paint. The disk is in good condition with just a few shallow scratches on its surface. All stamping is legible.
[I]A report on the condition of this mark was submitted to NGS, along with the following recovery note:[/I]
Recovered in good condition. The mark is 16, not 6, feet west of the centerline of the highway. It is located approximately 60 feet southwest and across the highway from powerpole 2T17875 6(1/2) ATTCH 71877/N45218, and 10 feet north of a highway speed limit sign.
[Photos:]LY1227, Pike County, PA
Eye-level view of the mark on the boulder.
The boulder is just west of the edge of Route 402.
Looking south along Route 402.
Powerpole approximately 60 feet NE of the mark.
||Rich in NEPA found LY1227
N 41° 22.638 W 075° 07.830
[B]Recovered in good condition.[/B]
This second order vertical control station is set in the top of an outcropping boulder along the south-bound shoulder of PA Rt. 402. The historical description leads reliably to the station, except that it is 16 feet west of the centerline of the highway. In addition, it is 10 feet north of a highway speed limit sign, and roughly 60 feet southwest of powerpole #2T17874 6½ ATTCH 71877/N45218. At the station a Garmin GPSmap76 receiver with remote active antenna was used to record WAAS-corrected coordinates which were 94 feet from the scaled coordinates listed in the NGS datasheet. The mark is well exposed, in good condition, and the stamped designation is legible. ~Rich in NEPA~
[Photos:]LY1227, "M 235 1959," Pike County, PA.
GPSr and the station mark.
Eyelevel view of station mark and setting.
Orientation view, facing north along Rt. 402.
Documented History (by the NGS)
|01/01/1959 by CGS (MONUMENTED)
|DESCRIBED BY COAST AND GEODETIC SURVEY 1959
8.1 MI SE FROM HAWLEY. 4.4 MILE SOUTHEAST ALONG U.S. HIGHWAY NO 6 FROM HAWLEY TO THE JUNCTION OF STATE HIGHWAY NO 402, THENCE SOUTH ALONG HY. 402 FOR 3.7 MILE, ALSO ABOUT 0.4 MILE NORTH OF GOOD SHEPHERD CHURCH, 0.1 MILE SOUTH OF A GARAGE, SET IN TOP AND THE CENTER OF A 5 FOOT BY 3 FOOT BOULDER ON THE RIGHTAWAY OF THE HIGHWAY, 63 FEET NORTHWEST AND ACROSS THE HIGHWAY FROM POWER POLE NO 3706, 6 FEET WEST AND ABOUT 2 FEET ABOVE THE CENTERLINE OF THE HIGHWAY.
- 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.