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: 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/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 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). 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: Alabama, Louisiana, Mississippi, and Texas (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).