CONTENTS DATA DESCRIPTION VARIABLES DATA RESTRICTIONS CITATION DATA ERRORS, CORRECTIONS AND QUALITY ASSESSMENT NO WARRANTY OR LIABILITY QUESTIONS ACKNOWLEDGEMENTS 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/Press-Release/www/2001/sumfile1.html The variables have been transformed to a quadilateral grid using proportional allocation. An explanation of proportional allocation is available at: http://sedac.ciesin.columbia.edu/plue/gpw/index.html?whatisagrid.html&2 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). DATA RESTRICTIONS These data are for noncommercial use only. No third party distribution of all, or parts, of the electronic files is authorized. CITATION Center for International Earth Science Information Network (CIESIN), Columbia University. 2005. U.S. Population Grids (Summary File 1), 2000: Houston-Galveston-Brazoria, TX Metropolitan Statistical Area (alpha version). Palisades, NY: Socioeconomic Data and Applications Center, CIESIN, Columbia University. http://sedac.ciesin.columbia.edu/hurricane2005.html DATA ERRORS, CORRECTIONS AND QUALITY ASSESSMENT CIESIN follows procedures designed to ensure that data disseminated by CIESIN are of reasonable quality. If, despite these procedures, users encounter apparent errors or misstatements in the data, please contact SEDAC User Services at 845/365-8920 or via e-mail at ciesin.info@ciesin.columbia.edu. Neither CIESIN nor NASA verifies or guarantees the accuracy, reliability, or completeness of any data provided. This version of the data is a preliminary "alpha" version designed for preliminary testing and review. Due to the pressing need for data posed by Hurricanes Katrina and Rita, we are making this dataset available for external distribution. Please provide us with feedback on any problems or errors with the data that you uncover. NO WARRANTY OR LIABILITY CIESIN provides this data without any warranty of any kind whatsoever, either express or implied. CIESIN shall not be liable for incidental, consequential, or special damages arising out of the use of any data provided by CIESIN. QUESTIONS If you have questions about these data, contact SEDAC User Services at 845/365-8920 or via e-mail at ciesin.info@ciesin.columbia.edu. 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).