Data and Mapping

NHDES works diligently to provide easy access to quality geographic data and mapping tools through Geographic Information System (GIS), the Environmental Monitoring Database (EMD) and the New Hampshire Geological Survey (NHGS). GIS is a digital tool that uses geographic (spatial) data to display features. Environmental data is available through custom maps and applications, which allow users to find, explore and share data. The EMD stores a wide variety of data collected from state agencies, federal agencies, municipalities and volunteer groups that is then used internally and externally for assessments, research projects, statistical reports and more. NHGS maps the state’s bedrock, surficial deposits and mineral resources through its ongoing participation in the federal STATEMAP component of the National Cooperative Geologic Mapping Program. As official steward of the National Hydrography Dataset and Watershed Boundary Dataset for New Hampshire, NHGS maintains digital versions of the state’s surface water features and their drainage divides. NHDES partners with many state and federal agencies to maintain and contribute to many maps and databases, including the University of New Hampshire statewide GIS clearinghouse, NH GRANIT, and the U.S. Geological Survey.