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What is GIS?

A GIS is a computer system capable of capturing, storing, analyzing, and displaying geographically referenced information; that is, data identified according to location. Practitioners also define a GIS as including the procedures, operating personnel, and spatial data that go into the system. Geographic information system (GIS) technology can be used for scientific investigations, resource management, and development planning. For example, a GIS might allow emergency planners to easily calculate emergency response times in the event of a natural disaster, or a GIS might be used to find wetlands that need protection from pollution.


Suffolk County maps and data are to be used for general reference purposes only. Map information is believed to be accurate but accuracy is not guaranteed. While every effort is made to provide and maintain current, accurate and complete information on this Web site, be advised that some data and information accessed through these pages may be preliminary in nature and presented prior to final review and approval.

Suffolk County GIS Portal

GIS Viewer

Suffolk County Shelter and Storm Surge Zone Mapping Tool

Suffolk County Open Data 

Suffolk County Voter Information Map


A digital orthophoto quadrangle (DOQ) is a computer-generated image of an aerial photograph in which image displacement caused by terrain relief and camera tilts has been removed. It combines the image characteristics of a photograph with the geometric qualities of a map.

Unlike a standard aerial photograph, relief displacement in Orthophotos has been removed so that ground features are displayed in their true ground position. This allows for the direct measurement of distance, areas, angles, and positions.

Suffolk County high-resolution orthoimagery is available for viewing and downloading from the New York State GIS Clearinghouse.

Suffolk County Government

H. Lee Dennison Bldg

100 Veterans Memorial Hwy
P.O. Box 6100
Hauppauge, NY 11788

Riverhead County Center

County Road 51
Riverhead, NY 11901