ArcGIS is a powerful desktop mapping software that enables users to analyze geospatial data and create their own custom designed maps. A popular use of ArcGIS has been to map the wide variety of demographic information available from the decennial census. Users can supply their own data or use the many datasets available from the GIS & Data Services – see Data Sources tab above. When you become a Friend of the Johns Hopkins University Libraries, you join one of the oldest Friends groups in the nation. What began in 1931 in a classroom in Gilman Hall has grown into a national network of supporters, true friends who have helped to provide generations of scholars with essential library resources. The “library” looks much different than it did 80 years ago, and technology continues to transform the ways in which researchers work. Thanks to Friends, we are able not simply to meet scholars’ needs but to anticipate them. Your generosity ensures that the only limits faced by our students and faculty are those of their imaginations. Source.