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Geographic Information Systems (GIS)

National Information

GIS Layers
Credit: Bureau of Land Management

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What is GIS?

A Geographic Information System or GIS is a computer system that allows you to map, model, query, and analyze large quantities of data within a single database according to their location. GIS gives you the power to:

GIS is a tool used by individuals and organizations, schools, governments, and businesses seeking innovative ways to solve their problems. GIS stores information about the world as a collection of layers that can be linked together by a common locational component such as latitude and longitude, a postal zip code, census tract name, or road name. These geographic references allow you to locate features on the earth's surface for analysis of patterns and trends. Dozens of map layers can be arrayed to display information about transportation networks, hydrography, population characteristics, economic activity, and political jurisdictions.

How Do We Use It?

Geographic or spatial information can assist in understanding the complex interrelationships of natural resources and human population as they relate to potential or known pollution sources. This additional information is beneficial to us in accomplishing our mission of protecting human health and the environment. The EPA Mid-Atlantic Region has a GIS Team which provides the necessary spatial data to our Regional staff to assist in environmental decision-making. This involves:


Don Evans (evans.don@epa.gov)
Geographic Information Systems (GIS) Team Leader
Office of Environmental Information & Analysis (3EA10)
Environmental Assessment & Innovation Division
US EPA Region 3
1650 Arch St.
Philadelphia, PA 19103-2029

Mid-Atlantic Region || Mid-Atlantic Env'l Assessment & Innovation || Mid-Atlantic Data

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