Available Online Maps

GIS (Geographic Information Systems) is a computer based mapping system that links elements or layers of a map to a database. Layers within a map may include parcel lines, roadways, water bodies, sidewalks, zoning boundaries, etc. Users can create, retrieve, analyze, model, and present data. Data can be disseminated via the web, hand held devices, digitally through .pdf or PowerPoint, or paper. The data within the system is referenced to the NH State Plane, feet coordinate system. The standardization of the data allows for it to be transferred to and from third parties more readily. 

GIS is utilized by many departments in town. Perhaps the most recognizable use is the assessor’s tax maps. Via an intranet webpage users can access the mapping database at the click of a button. Information on parcels, streets, water bodies, prime wetlands, etc is available in this dataset. The Fire Department uses GIS data within their emergency response system software. Address locations come loaded with assessing information on use codes, occupancy, and building structures. Other layers such as helicopter landing zones, hydrants, and interstate signs are displayed in the program. The Planning Department makes use of GIS for zoning, prime wetlands, and conservation mapping. The Community Development Department has utilized GIS for flood mitigation, Depot Re-Development, regional bussing, and traffic management projects. Public Works utilizes GIS as part of their asset management software. Assets accounted for in the program include hydrants, manholes, catch basins, pipes (water, sewer, and drain), and streets. Engineering uses GIS for day to day activities and project planning. 

The functionality of GIS allows for a wide array of uses. Specific users may require intricate details but many departments may benefit from a single users efforts.  Since mapping applications can be diverse, interdepartmental cooperation is a necessity in managing accurate and timely datasets.