2008. Flood Plain Cross Sections are derived from hydrologic models and are used to create the flood plain boundary. They were originally compiled from t...
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1986. The regulatory floodplain boundary reflects the limits of flooding resulting from a storm having an occurrence probability of 1%, identified as the...
2002. This dataset represents the Flood zones in Washington, DC 2002.
2002. The geodetic control points are the survey reference points registered with the National Geodetic Survey.
2002. Forest tracts is a base map data layer derived by automated processes and processed for cartographic representation at 1:2400 scale. The polygon f...
2004. The polygon represents future park area in Arlington County, VA.
6. The dataset represents the locations and attributes of Gas Stations in Washington, DC 2006.
1. This layer represents 5000 feet by 5000 feet geodetic grid for Prince William County. .
2002. The dataset contains lines that designate the legal geographic boundaries between county, city and township jurisdictions within the outer boundari...
1999. "Bedrock" is one of four layers which collectively describe the subsurface geologic formation, structural geology and surficial deposits. "Bedrock...