Skip to Content

Details for Benchmark: DG0106

N 33° 50.487 W 084° 14.559 (NAD 83)

Altitude: 1060.43

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

Location:
In DE KALB county, GA View Original Datasheet
Designation:
B 43
Marker Type:
survey disk
Setting:
pavements (street, sidewalk, curb, apron, etc.)
Stability:
Mark of questionable or unknown stability.

Reference Points

Must Read!

Benchmarks may be on private property or in dangerous locations. Obey local laws. By using the services on Geocaching.com you agree to this disclaimer.

After a day of geocaching at Stone Mountain Park, I enjoyed finding some nearby benchmarks. A witness post at the southern end of the overpass designates that the disk is nearby. This benchmark, embedded in the sidewalk along the Cooledge Road Bridge that runs over railroad tracks, was an easy find. Besides DG0106-B 43, I also located two additional disks on the bridge: Marta RM1 and Station 705. All three disks appear to remain in good condition.

[Photos:]
photoMarta B43
photoMarta RM1
photoStation 705

Some parking problems but an easy find.

Thanks

Found as described and in good condition. RM 1 is on the same side of the bridge and north of the main station.

[Photos:]
photoDG0106 - MARTA - B43
photo2010_04_12_IMG_2101
photo MARTA - RM 1

Another easy find. Mark found as described, except the street is now called Northlake Pkwy. I work about two miles away, and I found this one while on break.

[Photos:]
photoNorthlake Pkwy southbound/arrow marks the disc
photoThe mark itself
Forgot to add, there are a couple other unlisted marks on this same bridge.

Documented History (by the NGS)

01/01/1973 by MARTA (MONUMENTED)
DESCRIBED BY METRO ATLANTA RTA 1973 SET A STD. MARTA BRASS DISC DRILLED IN CONCRETE WALK AREA OF COOLEDGE RD., ON WEST SIDE OF OVERPASS BRIDGE OVER S.C.L. R/R, WEST OF EDGE CONCRETE SHELF 0.90 FT, 85 FT SOUTH OF NORTH END OF BRIDGE (COOLEDGE RD.).
01/01/1974 by NGS (GOOD)
RECOVERY NOTE BY NATIONAL GEODETIC SURVEY 1974 1.8 MI SW FROM TUCKER. A STANDARD MARTA BRASS DISK ON COOLEDGE RD. BRIDGE OVER THE SEABOARD COAST LINE RAILROAD TRACKS, ABOUT 1.8 MILES SOUTHWEST FROM THE SEABOARD COAST LINE DEPOT AT TUCKER, 85.0 FEET SOUTH OF NORTH END OF BRIDGE, 0.90 FEET WEST OF EDGE OF CONCRETE SHELF, DRILLED FLUSH IN CONCRETE WALK ON WEST SIDE OF BRIDGE.
02/08/1995 by MSI (GOOD)
RECOVERY NOTE BY MEASUREMENT SCIENCE INCORPORATED 1995 (PDK) RECOVERED AS DESCRIBED.
10/28/1999 by WOOLPT (GOOD)
RECOVERY NOTE BY WOOLPERT CONSULTANTS 1999 (JWK) RECOVERED AS DESCRIBED.

Control Text

  • The horizontal coordinates were established by GPS observations and adjusted by the National Geodetic Survey in September 1997.
  • The orthometric height was determined by differential leveling and adjusted by the National Geodetic Survey in June 1991.
  • 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.
  • 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.

Advertising with Us

Return to the Top of the Page