Contours - Central

The collection of aerial photography and production of an ortho quality DEM and orthophotography was executed to capture the existing ground conditions at a specific point in time for the purpose of GIS analysis. Orthophotography along with DEM data typically provides an accurate base for digitally representing geographic features upon which a GIS is built. The Virginia Geographic Information Network Division (VGIN) is the lead public agency in the Commonwealth for spatial data and GIS. VGIN's mission is to facilitate the cost-effective development and use of spatial data, GIS, and related technologies in organizations throughout the Commonwealth. Quantico Marine Corp Base (QMCB) area within Prince William County was excluded from 2017 Contour project. This area digital imagery was flown at 12 inch pixel resolution. The remainder of Prince William County was captured at a 6-inch resolution. The Contour and other associated data was created utilizing the 6-inch resolution.