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Documentation
DATA DESCRIPTION
U.S. Population Grids (Summary File 1), 2000: Houston-Galveston-Brazoria, TX Metropolitan Statistical Area (alpha version)
This archive contains an ArcInfo workspace with grids of demographic data from the year 2000 census. The grids cover the Houston-Galveston-Brazoria, TX Metropolitan Statistical Area 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 7.5 arc-seconds (0.002075 decimal degrees), or approximately 250 square meters.
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
M3362POP00G Population counts
Age
M3362A100G Population under age 1
M3362A200G Population ages 1 to 4
M3362A300G Population ages 5 to 17
M3362A400G Population ages 18 to 24
M3362A500G Population ages 25 to 64
M3362A600G Population ages 65 to 79
M3362A700G Population age 80 and older
Race and Ethnicity
M3362AS00G Asian alone
M3362AM00G American Indian and Alaska Native alone
M3362BL00G Black or African American alone
M3362PI00G Native Hawaiian and Other Pacific Islander alone
M3362HI00G Hispanic
M3362NHB00G Non-Hispanic Black
M3362NHW00G Non-Hispanic White
M3362WH00G White alone
Housing/Households
M3362FEM00G Female headed households with related children under 18
M3362HH00G Households
M3362HHP00G Population in households
M3362HU00G Housing units
M3362HU1P00G One-person housing units
M3362OWN00G Owner occupied housing units
M3362OCC00G Occupied housing units
M3362SEA00G Vacant housing unit, for seasonal, recreational or occasional use
Area
M3362AREA00G 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).