Geographic Information Systems (GIS)

schematic of GIS mapping layers PENNDOT is using Geographic Information Systems (GIS) to assist in the analysis and selection of alternatives for the U.S. 219 Improvements Project. GIS is a computer system that allows the Project team to assemble, store, manipulate, and display information according to its location. Maps and other data, such as environmental features and engineering parameters, are stored as layers of information in GIS. The layers of information can be used to build upon each other to provide a picture of conditions that are otherwise difficult to understand.

For the U.S. 219 Improvements Project, the Project Team used GIS to develop a database of features such as roads, property lines, buildings, land use and other environmental features, and aerial photography. As we obtain new information, the data in GIS is continually updated.

We also used GIS to analyze the potential effects of the study alternatives on natural resources such as wetlands, streams, wildlife, and vegetation; on farms, communities, residences, and businesses; and on cultural resources such as historic structures and archaeological sites. GIS has allowed us to make a direct comparison of each environmental resource layer, or data set, to each alternative. The Project Team used the GIS data and impact analyses to refine the alternatives and to make direct comparisons of the potential impacts of each alternative. We have also used GIS throughout the study to illustrate features and impacts for reports and for displays at various public and agency meetings.

GIS is an important tool in the decision-making process for the U.S. 219 Improvements Project, as PENNDOT strives to design the best possible roadway to serve the community while enhancing the quality of life to the people of Somerset County.

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Geographic Information Systems (GIS)