This datalayer is a point coverage representing cities worldwide and was produced by ESRI and published as part of the USGS Global GIS database. It was originally issued as part of the ESRI Data & Maps 2000 data set. Attribute data includes information on city size (population) and port status. The USGS Global GIS database contains a wealth of USGS and other public domain data, including global coverages of elevation, landcover, seismicity, and resources of minerals and energy at a nominal scale of 1:1 million. The U.S. Geological Survey (USGS) and The American Geological Institute (AGI) announced a cooperative agreement that will focus on making the USGS Global Geographic Information System (GIS) database readily available to educators and the general public in the form of a DVD based world atlas.