This line dataset represents stone walls in Westchester County, New York. This layer was collected as one of the BARRIER features derived from aerial photography acquired in April 2004. The data was photogrammetrically stereo-compiled to North American Datum 1983; New York State Plane East Zone. Image horizontal accuracy is +/-2.5 ft. at the 90% confidence level. The data was initially compiled in 40 separate delivery areas and then merged together into a county-wide file.