This project is an effort to link a range of georeferenced demographic and other socioeconomic data products with remote sensing data related to land cover and use. Population dynamics and distribution have been consistently identified as key elements in understanding human interactions with the environment and in considering possible responses to environmental change. The National Research Council (NRC) has identified population dynamics as one of five priority areas of research for the US Global Change Research Program. It also pointed out the key role of georeferenced social data in two other priority areas, improving the understanding of land use change and assessing impacts, vulnerability, and adaptation to global change (NRC, 1994.) The 1992 report of the Human Dimensions of Global Environmental Change Programme (HDP) on Population Data and Global Environmental Change emphasized the importance of georeferenced population data for global change research and applications and recommended development of data bases at several different levels of aggregation and resolution.

In order to respond to the above needs, SEDAC is providing several population data products and services: an archive of Census-related products, a collection of Chinese data resources, a global population database, a Gridded Population of the World, a Georeferenced Population Data Sets of Mexico, and an integrated population and land cover data for the state of Michigan. The following interactive tools provide access to U.S. Census data: DDViewer is an on-line interactive mapping tool of 1990 US Census data while DDCarto allows for interactive ordering of those data in prominent GIS formats; Geocorr creates correspondence between Census and other geographies for the US.

Archive of Census-Related Products

The Archive of Census-Related Products contains Boundary Files, Standard Extract Files, Enhanced Migration Files, an Intersection Dataset, and ZIP Equivalency Extract Files derived from selected U.S. Bureau of the Census datasets. The Boundary Files are a derived product from TIGER 1992 (Topologically Integrated Geographic Encoding and Referencing) files (Version 5). Files have been generated by county for all census blocks and street intersections. The Standard Extract Files are based on Summary Tape File 3A (STF3A) for the 1990 U.S. Census. The Enhanced Migration Files are state files with "population in" and "population out" fields on each record to facilitate net-migration calculations by age, race, sex, or other variables from 1985 to 1990. The Intersection Dataset was created from the TIGER 1992 files. This dataset shows the intersections, street names, and the latitude-longitude of intersections. The ZIP Equivalency Extract Files contain selected census block demographic data with 5-digit ZIP codes within each State (including county portions of the ZIP codes).

The U.S. Demography Home Page is part of an initiative to identify, document, and provide simple access to demographic information concerning the U.S. This home page consists of a series of cascading hypertext links providing access to national data resources, on-line supporting documentation (codebooks, data dictionaries, citations), and extraction tools for data access. You may connect to an anonymous ftp service for data file retrieval.

China Dimensions

The China Dimensions Data Collection provides guides for and access to a rich collection of data resources on the People's Republic of China. Highlights include digital administrative boundaries; fundamental GIS layers; county-level data on population, agriculture, economics and hospitals; and interactive access to the 1982 census of population.

Global Population Database

The Global Population Database was developed by the International Programs Center (formerly the Center for International Research) of the U.S. Bureau of the Census. The database maps populations of either 20 minutes of latitude by 30 minutes of longitude for developing countries or 5 minutes by 7.5 minutes for developed countries. You may refer to the Dataset Guide for Global Population Database for a detailed description of the database and information on how to access it.

Gridded Population of the World

Gridded Population of the World (GPW v3) depicts the distribution of human populations across the globe.   Version 3 is the most detailed version of GPW to date, with more than three times the amount of input data as the previous version.  GPW v3 includes population and population density estimates referenced to a grid of 2.5 x 2.5 minute latitude-longitude quadrilateral grids for 1990-2015 in five year increments. The collection includes maps, documentation and data for on-line viewing and downloading.

The Global Rural-Urban Mapping Project (GRUMP) provides a new suite of data products that add urban-rural specification to the Gridded Population of the World (see below).  This project was developed out of a need for researchers to be able to distinguish population spatially by urban and rural areas.  The central data product resulting from GRUMP is a Gridded Population of the World with Urban Reallocation with a grid cell resolution of 30 arc-seconds.  The data collection also includes a land area grid showing worldwide urban areal extents and a database of human settlements, their spatial coordinates, and populations.  GRUMP is currently in its alpha version.

Georeferenced Population Data Sets of Mexico

The Georeferenced Population Data Sets of Mexico were developed as part of a CIESIN initiative to provide scientists with spatially referenced demographic data for conducting assessments of human interactions with the environment. The collection consists of the following products: Population Database of Mexico; Urban Place, Time-Series Population Spreadsheet of Mexico; Urban Place Geographic Information System (GIS) of Mexico; GIS of Mexican Localities; GIS Coverage of Mexican States; GIS Coverage of Mexican Municipalities; and Raster-based Coverage of Mexican Population. The Dataset Guide for the Georeferenced Population Data Sets of Mexico presents a detailed discussion of the database and information on how to access it.

US-Mexico Demographic Data Viewer 3.1:
Interactive mapping of 200+ demographic and socio-economic variables that are compatible at regional, state, and county/municipio levels between the United States and Mexico

Integrated Population/Land Cover Data for Michigan

SEDAC provides online access to integrated population/land cover data for the state of Michigan that ties together 1-kilometer land cover data from EROS Data Center (EDC) with gridded population and housing data from the U.S. Census. Variables include Total Persons and Total Housing Unit Structures from the 1990 census and the land cover classification (159 classes). The coverages for the coterminous US have been permanently taken off-line.

Demographic Data Viewer

DDViewer provides rapid data mapping, viewing and analysis to the internet community. It currently supports U.S. Census demographic data (STF3A 1990) and Boundary Files (TIGER 1992) which cover all the U.S. states, counties, county subdivisions, census tracts and blockgroups for more than 200 variables of population, housing, education, employment, etc. It can be applied more widely in combination with other databases, such as for risk analysis with environmental databases, or in business research using the U.S. Census national retail databases.

US-Mexico Demographic Data Viewer
US-Mexico DDViewer is an interactive application that provides rapid, interactive data mapping, viewing, and analysis of more than 200 socioeconomic variables that are congruent between the United States and Mexico. A useful tool for browsing and visualizing patterns at geographic levels ranging from region s to counties/municipios, the US-Mexico DDViewer may be used to map population, vital statistic, land area, and household data.

Demographic Data Cartogram Service

DDCarto provides digital coverages of U.S. Census demographic data to GIS users. This GIS format conversion service supports Atlas GIS^®, ArcInfo ^® and MapInfo^® data formats. Our data are stored in Atlas GIS (.bna) format, and these data can be retrieved immediately by FTP. Conversions to ArcInfo (.e00) and MapInfo (.mid & .mif) are run overnight in batch mode. Available data include boundaries and attributes from the CIESIN Archive of Census Related Products (described above) at county, census tract, block group and block resolution for all 50 states.

Geographic Correspondence Engine

Geocorr creates geographic correspondence files between different geographic summary levels. It determines the amount of intersection between units of one geographic level and those of another. This is useful for to move data between counties and five-digit zip codes, or other geographies.

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