A Geographic Information System (GIS) lets us visualize, question, analyze, and interpret data to understand relationships, patterns, and trends in a geographic context.
There are several tools that will allow you to create and modify GIS data. These include:
ArcGIS is a subscription based-software. Georgetown University has a subscription to the desktop software arcGIS, which is located in the library on PCs. You can also download the software on your PC. Please see the directions to install ArcGIS on your computer