Policies and Services

About Our Data

Calvert County GIS data is maintained to the best ability of Calvert County Government. GIS data is provided "as is" and users assume all risks associated with decisions based on this data. Data is for illustration purposes and should only be used as such. The data provided through Calvert County Government’s GIS resources is not intended to be used for legal or surveying determinations of any kind. Digital data is distributed under a Creative Commons Attribution 4.0 International License.

Unless otherwise specified, all Calvert County GIS data are stored in the spatial reference outlined:
Projected Coordinate System: Maryland State Plane FIPS 1900 Feet
Datum: North American Datum 1983
Geographic Coordinate System: GCS North American 1983
WKID: 2248

GIS Data Distribution

The Department of Technology Services is pleased to announce the availability of 2017 computer aided drafting and design (CADD) files for planimetrics and topography. The new CADD files were derived from QL1 high-definition LiDAR and provide a finer, more accurate representation of the terrain.

Calvert County GIS makes several digital datasets available for free download in an ESRI shapefile, ESRI geodatabase or KML format. See our Open GIS Data page for a searchable list of downloadable datasets.

Topographic data is also available for download in a .dwg format based on the Calvert County Topo Tile Grid System (PDF). The topographic data are based on the 2017 aerial photography.

Download the GIS topographic/planimetric data dictionary & layer descriptions (PDF)

Use the interactive map on the Open GIS Data page to find the topo grid of your choice by panning and zooming the map. Click on the map inside the grid you want to download and then click the link in the popup box to retrieve your data.

Paper Maps

Customers may create and print their own 8.5 inches by 11 inches topographic and aerial maps from our interactive maps page. The Property and Topo Map is especially well suited for printing maps that are suitable for county building permit submissions.

Large-format custom maps are available by special order and priced according to size and complexity. Customer should submit a Topographic Map Request Form (PDF) and submit it to the Department of Technology Services. Custom map requests generally take 2-3 days to complete and must be picked up in our office at 176 Main Street in Prince Frederick.

For more information please contact us.