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Details for Benchmark: CH0178

N 31° 59.471 W 112° 45.052 (NAD 83)

Altitude: 1999

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

Location:
In PIMA county, AZ View Original Datasheet
Designation:
LOW HILL
Marker Type:
triangulation station disk
Setting:
in a boulder
Stability:

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Recovered station LOW HILL along with RM 1 and RM 2, all in good condition.

[Photos:]
photoCH0178 LOW HILL closeup
photoCH0178 LOW HILL wide view
photoCH0178 LOW HILL RM 1
photoCH0178 LOW HILL RM 2
photoWith the GPSr

Please see the complete recovery, including text and photos, at my website: [b][url=http://surveymarks.planetzhanna.com/surveymarks/ch0178/]CH0178 - LOW HILL[/url][/b].

Zhanna

This entry was edited by Zhanna on Friday, 07 December 2012 at 03:18:17 UTC.

Documented History (by the NGS)

1/1/1936 by CGS (MONUMENTED)
DESCRIBED BY COAST AND GEODETIC SURVEY 1936 (JB) ON THE PAPAGO INDIAN RESERVATION, ABOUT 1-1/2 MILES EAST OF ITS WEST BOUNDARY, 28 MILES SOUTH-SOUTHEAST OF AJO, 10 MILES NORTH-NORTHEAST OF SONOYTA, SONORA, MEXICO, JUST SOUTHWEST OF THE BASE OF THE SIERRA DEL AJO, ABOUT 1-1/4 MILES EAST OF THE AJO-SONOYTA ROAD, ON THE SUMMIT OF A LOW BRUSHY HILL AT ITS SOUTH END AND ABOUT 50 YARDS SOUTH OF AND 5 FEET LOWER THAN ITS HIGHEST POINT, IN TOP OF ONE OF THE BLACK BASALTIC BOULDERS WHICH COVER THE SUMMIT AND IN THE CENTER OF A HALF CIRCLE OF LOOSE BOULDERS. MARKED BY A STANDARD BRONZE DISK. REFERENCE MARK NO. 1, A STANDARD BRONZE REFERENCE DISK, IS 2.972 METERS (9.75 FEET) FROM STATION S 85 DEG 24 MIN E. REFERENCE MARK NO. 2, A STANDARD BRONZE REFERENCE DISK, AT THE SOUTH END OF THE SUMMIT, IS 13.215 METERS (43.36 FEET) FROM STATION S 40 DEG 03 MIN W. THE AZIMUTH MARK, A STANDARD BRONZE DISK, IS ON THE SUMMIT OF THE FIRST HILL TO THE WEST ACROSS THE WASH, ABOUT 75 YARDS NORTH OF THE SOUTH END OF THE HILL, ON ITS LONGITUDINAL CENTER AND ONE-HALF MILE FROM STATION S 75 DEG 46 MIN W.
1/1/1977 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1977 (TT) THE STATION AND REFERENCE MARKS WERE RECOVERED AND FOUND IN GOOD CONDITION. THE AZIMUTH MARK WAS NOT RECOVERED. THE DISTANCES TO RMS CHECKED WITHIN 2 CENTIMETERS, AZIMUTH TO RM 2 CHECKED, RM 1 TOO CLOSE TO MEASURE. TO REACH FROM THE JUNCTION OF ARIZONA HWYS. 85 AND 86 AT WHY, TRAVEL SOUTH ON HWY. 85 TO MILE POST 75.3 AND A ROAD ON THE LEFT (21 MILE LOOP RD.), TURN LEFT AND CONTINUE ON LOOP RD. FOR 2 MILES TO A RD. FORK, TAKE LEFT FORK AND CONTINUE ON LOOP RD. FOR 2.15 MILES TO A LOW BASALTIC HILL ON THE RIGHT. STATION IS ON SOUTH END OF HILL. ABOUT A 5 MINUTE PACK. HEIGHT OF LIGHT ABOVE STATION MARK 5 FEET. AIRLINE DISTANCE AND DIRECTION FROM NEAREST TOWN 26 MILES SOUTHEAST OF AJO.

Control Text

  • The horizontal coordinates were established by classical geodetic methods and adjusted by the National Geodetic Survey in August 1993.
  • The NAVD 88 height was computed by applying the VERTCON shift value to the NGVD 29 height (displayed under SUPERSEDED SURVEY CONTROL.)
  • The Laplace correction was computed from DEFLEC99 derived deflections.
  • The geoid height was determined by GEOID99.

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