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Shipping Fairways
Shipping zones delineate activities and regulations for marine vessel traffic. Traffic lanes define specific traffic flow, while traffic separation zones assist opposing streams... -
National Flood Hazard Layer (NFHL)
The National Flood Hazard Layer (NFHL) is a compilation of GIS data that comprises a nationwide digital Flood Insurance Rate Map. The GIS data and services are designed to... -
Historical Tropical Storm Tracks
This Historical North Atlantic and Eastern North Pacific Tropical Cyclone Tracks file contains the 6-hourly (0000, 0600, 1200, 1800 UTC) center locations and intensities for all... -
Canopy 2013
This dataset represents the extent of the tree canopy for the City of Alexandria. This dataset was created by extracting spectural signature information from satellite imagery... -
Streams
Line feature representing the centerline of smaller stream channels in the City of Alexandria, Virginia. Provides centerline location of all streams less than 5 feet in width. -
Shoreline
Line to delineate the City of Alexandria's shoreline along the Potomac River. Boundary between land and the Potomac River by physical structure or mean tide line. -
Resource Protection Areas
A polygon feature representing Resource Protection Areas for the City of Alexandria, VA. Resource Protection Areas are an identification of tidal wetlands, tidal shores and... -
Summarizing Hurricane Harvey's Environmental Impacts
Normally the Houston-Galveston region receives on average 45 inches of rainfall a year. During Hurricane Harvey, some areas received over 50 inches of rain in less than a... -
Natural Intermittent Stream Buffer
A polygon feature representing either an intermittent stream or a wetland that does not satisfy the criteria of an RPA. This identification is mandated through the Chesapeake...