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Documentation
DATA DESCRIPTION
U.S. Population Grids (Summary File 1), 2000: Alabama, Louisiana, Mississippi, and Texas (alpha version)
This archive contains an ArcInfo workspace with grids of demographic data from the year 2000 census. The grids cover the states Alabama, Louisiana, Mississippi, and Texas for the set of variables described below. The grids are stored in geographic coordinates with the following parameters:
Projection: Geographic
Spheroid: WGS84
Datum: NAD83
Units: Decimal Degrees
The grids have a resolution of 30 arc-seconds (0.0083 decimal degrees), or approximately 1 square km.
The gridded variables are based on census block geography from Census 2000 TIGER/Line Files and census variables (population, households, and housing variables) from Summary File 1. For more details on these sources see:
Census 2000 TIGER Line Files: http://www.census.gov/geo/www/tiger/tigerua/ua_tgr2k.html
Summary File 1: http://www.census.gov/census2000/sumfile1.html
The variables have been transformed to a quadilateral grid using proportional allocation. An explanation of proportional allocation is available in the What's a Grid? page from GPW v3.
VARIABLES
All variables are stored as counts (i.e., number of persons), one per grid. For the easy calculation of density grids, a land area grid is included. To create a density grid (per square kilometer), simply divide a count grid by the land area grid.
Variable descriptions by grid name:
Population
GC2POP00G Population counts
Age
GC2A100G Population under age 1
GC2A200G Population ages 1 to 4
GC2A300G Population ages 5 to 17
GC2A400G Population ages 18 to 24
GC2A500G Population ages 25 to 64
GC2A600G Population ages 65 to 79
GC2A700G Population age 80 and older
Race and Ethnicity
GC2AS00G Asian alone
GC2AM00G American Indian and Alaska Native alone
GC2BL00G Black or African American alone
GC2PI00G Native Hawaiian and Other Pacific Islander alone
GC2HI00G Hispanic
GC2NHB00G Non-Hispanic Black
GC2NHW00G Non-Hispanic White
GC2WH00G White alone
Housing/Households
GC2FEM00G Female headed households with related children under 18
GC2HH00G Households
GC2HHP00G Population in households
GC2HU00G Housing units
GC2HU1P00G One-person housing units
GC2OWN00G Owner occupied housing units
GC2OCC00G Occupied housing units
GC2SEA00G Vacant housing unit, for seasonal, recreational or occasional use
Area
GC2AREA00G Land area in square kilometers
For more details, see the spreadsheet included in the archive (SF1_Variable_documentation.xls).
ACKNOWLEDGEMENTS
This work, including access to the data and technical assistance, is provided by CIESIN, with funding from the National Aeronautics and Space Administration under Contract NAS5-03117 for the Continued Operation of the Socioeconomic Data and Applications Center (SEDAC).