Geographic Information Systems (GIS) is a computer support system composed of software, hardware, data, people, and procedures, connected to each other by a network. It has been a popular and powerful technique for urban planning, environmental modeling and decision making, coastal resource management, hydrological applications, etc.

This page provides access to geospatial data formatted as shape and grid files suitable for use in GIS applications. To download any of the files listed below, click the link with your preferred projection (NAD83 or WGS84). Open the files on your hard drive using GIS software. If you have no GIS software on your computer, download and install free ArcGIS Explorer first.