To permit cartographic display of countries and territories that exactly match the GRUMPv1 population surfaces

To provide populated place (point) data with consistent population estimates.

To permit cartographic display of coastlines that exactly match the GRUMPv1 population surfaces.

To provide an easily accessible, corrected data set of polygons for hazardous waste sites in the United States which can be used to identify nearby populations and assess their potential risk.

To provide the ATSDR polygon data set of hazardous waste sites in the United States, which can be used to identify nearby populations and assess their potential risk.