Data Basin is a science-based mapping and analysis platform that supports learning, research, and sustainable environmental stewardship.
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A map service on the www depicting the location and boundaries of the
United States, the District of Columbia and the US territories. It
includes common identifiers for these entities so this data set can be
used in conjunction with other data sets describing states. This map
service uses a generalized states layer for display at small scales.
The data are an extract of the Census codes and boundaries from the following Census FTP site: ftp://ftp2.census.gov/geo/tiger. Since the Census data do not include the coastline detail, the coastal boundaries have been spatially clipped to the Health Resources and Services Administration (HRSA) coastline detail. This coastline detail was derived from the Census water blocks and are available from http://datawarehouse.hrsa.gov.
Layers in this dataset are based on combinations of the following options.
You may choose from these options to select a specific layer on the map page.