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Details for Benchmark: AI8514

N 39° 15.829 W 076° 59.706 (NAD 83)

Altitude: 614

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

Location:
In HOWARD county, MD View Original Datasheet
Designation:
22DA
Marker Type:
survey disk
Setting:
set into the top of a round concrete monument
Stability:
May hold, but of type commonly subject to surface motion.

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Found as described by ArtMan and about one inch below the surface.

[Photos:]
photoAI8514 - the Mark
photoAI8514 in Howard Co., MD
Looking west-southwest along the northshoulder of Tridelphia Road, the mark is at the white notebook just to the right of the truck, center. Note the Kennard-Tridelphia street sign pole in the foreground.

2000 description is maddeningly imprecise, including distances but not directions. Grrrr!

The fence has two corner posts. The one mesured from is at the end of the long run along Triadealphia Road. The station is 5.5 feet southwest of that corner post and 6.9 feet southeast of the next post west along Triadelphia Road. (Distances taken from station description and are approximately correct but were not remeasured.) It is also about 25 feet west of the Kennard-Triadelphia street sign.

[last edit: 8/22/2003 5:11:18 AM PST]

[Photos:]
photoCloseup of 22DA, Howard Co., MD
photoArea view of 22DA, Howard Co., MD
View west down Triadelphia Rd.

Documented History (by the NGS)

01/01/1994 by MD-027 (MONUMENTED)
09/15/2000 by MD-027 (GOOD)
DESCRIBED BY HOWARD COUNTY MARYLAND 2000 (RFM) DESCRIPTION BY HOWARD COUNTY 2000. THE STATION IS NEAR GLENELG, ABOUT SEVEN MILES SOUTH OF SYKESVILLE, 7 MILES WNW OF COLUMBIA AND 8 MILES NE OF LAYTONSVILLE.. TO REACH THE STATION FROM THE POST OFFICE AY GLENELG AT THE INTERSECTION OF TEN OAKS ROAD AND TRIADELPHIA ROAD, GO WEST 0.45 MILES ALONG TRIADELPHIA ROAD TO THE CORNER OF KENNARD ROAD, THE MARK IS ON THE NW CORNER OF THE INTERSECTION. THE MARK IS 21 FEET NORTH OF THE CENTERLINE OF TRIADELPHIA ROAD, 5.5 FEET TO THE CORNER POST OF A PVC FENCE AND 6.9 FEET TO THE SECOND POST OF SAID FENCE. THE MARK IS A STANDARD HOWARD COUNTY SURVEY DISC SET ON CONCRETE BASE , FLUSH WITH THE GROUND.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in November 2000.
  • 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.

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