GIS data are now available from the Maryland Historical Trust. Use the license agreement/order form at the bottom of this page to order data. Data offered include the following:
Historic Sites Data Layers
There are four historic sites GIS data sets distributed for outside use:
National Register of Historic Properties
This data layer depicts boundaries of historic properties in Maryland that are listed on the National Register of Historic Places, a listing maintained by the U.S. Department of Interior.
Maryland Historical Trust Preservation Easements
This data layer depicts properties where owners have entered into an easement agreement with the Maryland Historical Trust to protect their property's historic character.
Maryland Inventory of Historic Properties
This data layer depicts all historic properties which have been listed on the state inventory as having historic significance or potential historic significance. Properties in Baltimore City have not been digitally mapped. Since county survey is not complete, the absence of sites in the GIS layer should not be interpreted as negative data.
Archeological Sites Presence Grid
This data layer consists of 700-meter wide grid cells superimposed on the state. Cells which cover areas where archeological sites have been recorded in the Maryland state inventory are classified as “present.” Specific archeological site locations are not released in order to protect the resource. Again, since survey is not complete, the absence of sites in the GIS layer should not be interpreted as negative data.
Each set consists of a digital file of the property locations (ArcView .SHP format unless otherwise specified), and a database table which contains identification information. The cost is $128 for a CD containing the entire state's data. If only one or a few counties are requested, they can be specified but the cost will be the same.
USGS topographic maps
The USGS 7.5' topographic quadrangle maps covering Maryland were scanned, and are available as TIFF images. The images are scanned at 250 dpi and are 256 color. Each quad map is approximately 33 megabytes in size. The maps are available on DVD.
