ARCDBA.Building_2005_Poly

Location of all buildings throughout Prince George's County, Maryland

The countywide building footprint information was stereo-photogrametrically captured and compiled at a 1 inch=200 foot scale using geodetic control and 1" = 1,200 foot scale aerial photography taken in Spring, 2000.

The building layer will be stereo-photogrametrically captured from digital orthophotography. The term commonly used for this planimetric layer is building footprints. In actuality, the true building footprint cannot be gleaned from aerial photography and so the capture of buildings is more or less confined to the capture of rooflines.

All structures with roofs having an aerial coverage of 200 square feet or greater will be captured from the photography. Buildings will be delineated by tracing the apparent edge of the roofline for dwellings, businesses, houses, house trailers, garages, and barns. Where appropriate, buildings will be squared at the corners so that the corners are orthogonal and within the established mapping accuracy tolerance for 1:2400 scale mapping.

Interior rooflines, such as dormers, will not be captured. Roofline extensions, such as carports, decks, patios, stairs, etc. will not be captured or shown.

The building layer should be a seamless cover with no buildings being split for some imposed sheet tiling. Those buildings found at the edge of the model (at the Prince George's/Montgomery County boundary or the Prince George's/Washington D. C. boundary) should be shown in their entirety.

All building polygons should show proper closure and contain one pseudonode. The vectorized building roofline should very closely fit the building rooflines displayed on the digital orthophotography. Those buildings under construction and ruins were also captured. Annotation was labeled as "U/C" and "RUIN" as appropriate for these features.

The 2000 building layer was used as as base and only changes were added.

Info Tech, Inc. created this layer.