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Details for Benchmark: AI8085

N 39° 21.631 W 076° 38.096 (NAD 83)

Altitude: 410

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

Location:
In C OF BALTIMORE county, MD View Original Datasheet
Designation:
X-511
Marker Type:
traverse station 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 in good condition.
Fire hydrant mentioned in ArtMan's report has been painted orange (or replaced).

[Photos:]
photoAI8085 mark
AI8085 mark
photoAI8085 view N
View to the north; mark is at middle right in sidewalk near fire hydrant
photoAI8085 view S
View to the S; mark is at lower left in front of fore hydrant. Entrance to Gillman School is in left background.

Located as described.

[Photos:]
photoX-511 AI8085

It looks like a new sidewalk was laid in this area with care being taken not to cover this disk with concrete.

Station is located as described, one block (more or less) along Roland Avenue southwest of Northern Parkway. Disk will be on the left as you travel down Roland from Northern Parkway and is approximately across from the driveway leading to the grand house at number 5408.

[Photos:]
photoCloseup, station X 511 (AI8085), Baltimore, MD
photoArea view, station X 511 (AI8085), Baltimore, MD
View from the southwest. Arrow indicates disk in sidewalk, just past patriotic fire hydrant. Private school is to the right. Northern Parkway intersection is in the distance. Base of light pole 30308 appears to be located at top of hydrant.

The disk is still there, embedded in the sidewalk. The other landmarks are also present, including metal utility pole 30308, although most poles in the vicinity have no numbers. "X511" is spray-painted in orange on the curb next to the disk, though it's fading. The disk reads "City of Baltimore Bureau of Plans and Surveys, Survey Marker, $100 fine for disturbing this mark." There's another city marker, not listed on geocaching.com, to the south of this one, in the sidewalk at the N.E. corner of Roland and Colorado, in front of Eddie's Market grocery. That one is under a mini-manhole cover marked "City of / Survey Point / Baltimore".

[This entry was edited by LeoGeo on Tuesday, July 06, 2004 at 6:16:22 AM.]

Documented History (by the NGS)

01/01/1999 by MD0050 (MONUMENTED)
DESCRIBED BY CITY OF BALTIMORE MARYLAND 1999 THE STATION IS LOCATED 5.17 MILES (8.32 KM) NORTH OF THE INNER HARBOR OF BALTIMORE CITY. THE POINT IS A BRASS DISC SET IN A CONCRETE WALK ON THE EAST SIDE OF ROLAND AVE APPROXIMATELY 75.0 FT. (22.9 M) N.W. OF WALK LEADING TO THE GILMAN COUNTRY SCHOOL. IT IS 5.2 FT. (1.6 M) N.E. OF A FIRE HYDRANT, 1.5 FT. (0.5 M) EAST OF THE FACE OF CURB FRONTING ON ROLAND AVE., AND 21.90 FT. (6.68 M) S.W. FROM A LIGHT POLE NO.30308.

Control Text

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