To provide a baseline dataset for the evaluation of climate change impact.

To provide a database of public China maps, searchable by location, scale, content, publisher, and publication date.

To provide a dynamic matrix for the identification of spatially and temporally-specific data on Chinese administrative units.

To provide descriptive information on health care institutions in China between 1950 and 1985.

To provide a database of works pertaining to the administrative geography of China, searchable by location, time, and subject matter.

To provide historical agricultural statistics of the People's Republic of China for 1949-1990 at the provincial and national levels.

To provide access to demographic data for the U.S.

To provide population and housing data for the U.S.

To provide street intersection data for each county in the U.S.

To provide population and housing data for the U.S.

To provide population and housing data for the U.S.

To provide demographic data for the U.S.

To provide access to demographic data for the U.S.

To provide migration data at the county and state levels for the U.S.

To provide time-series population data for Mexico for conducting assessments of human interactions with the environment.

To provide geographically referenced population data for Mexico for conducting assessments of human interactions with the environment.

To provide US housing and related data for demographic analysis; The samples can be extended to analysis of the whole United States for many purposes. Comparative analysis across different groups is possible using the PUMS data.