FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
TITLE: 2000 U.S. CENSUS URBANIZED AREAS/CLUSTERS
Geodataset Name: UA2000 Geodataset Type: SHAPE Geodataset Feature: POLYGON
GENERAL DESCRIPTION:
This dataset delineates boundaries for Urban Areas (UA) and Urban Clusters (UC) for the State of Florida as defined by the 2000 Census. (See "User Notes" for more information on Urban Areas and Urban Clusters). DATA SOURCE(S): U.S. Census Bureau SCALE OF ORIGINAL SOURCE MAPS: 1:100,000 DATE OF AUTOMATION OR SOURCE: 05/20/2002 GEODATASET EXTENT: State of Florida
Datafile Name: UA2000.DBF ITEM NAME WIDTH TYPE PRECISION SHAPE 8 SHAPEPOLY 0 UA 5 CHARACTER 0 NAME 90 CHARACTER 0 UA_TYPE 2 CHARACTER 0 POPULATION 20 DECIMAL 0 POPDENSITY 20 DECIMAL 0 AREA_M 17 DECIMAL 1 DESCRIPT 90 CHARACTER 0
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
ITEM ITEM DESCRIPTION SHAPE Data attribute inherent to the ESRI shapefile format, which defines the data as a point, polyline, or polygon. UA UA/UC 5 digit code NAME Name of UA/UC UA_TYPE Indicates if entity is a UA/UC (Value UA=Urbanized Area, UC=Urban Cluster) POPULATION Population of UA/UC POPDENSITY Population density AREA Area in sq. meters DESCRIPT FGDL added item based on NAME
USER NOTES:
An urbanized area (UA) consists of densely settled territory that contains 50,000 or more people. A UA may contain both place and nonplace territory. The U.S. Census Bureau delineates UAs to provide a better separation of urban and rural territory, population, and housing in the vicinity of large places. At least 35,000 people in a UA must live in an area that is not part of a military reservation. For Census 2000, UA delineations constitute a "zero-based" approach that requires no "grandfathering" of UA boundaries from the 1990 census. Because of the more stringent density requirements (and the less restrictive extended place criteria), some territory that was classified as urbanized for the 1990 census has been reclassified as rural. In addition, some areas that were identified as UAs for the 1990 census have been reclassified as urban clusters. The title of a UA may contain up to three incorporated place names, and will include the two-letter U.S. Postal Service abbreviation for each state into which the UA extends. However, if the UA does not contain an incorporated place, the UA title will include the single name of the geographic entity that occurs first from the following list: census designated place, minor civil division, or populated place recognized by the U.S. Geological Survey. Each UA is assigned a five-digit census code in alphabetical sequence on a nationwide basis, interspersed with the codes for urban clusters (UCs), also in alphabetical sequence. For the 1990 census, the U.S. Census Bureau assigned a four-digit UA code based on the MA codes. For Census 2000, a separate flag is included in data tabulation files to differentiate between UAs and UCs. In printed reports, this differentiation is included in the name. An urban cluster (UC) consists of densely settled territory that has at least 2,500 people but fewer than 50,000 people. (A UC can have 50,000 or more people if fewer than 35,000 people live in an area that is not part of a military reservation.) The U.S. Census Bureau introduced the UC for Census 2000 to provide a more consistent and accurate measure of the population concentration in and around places. UCs replace the provision in the 1990 and previous censuses that defined as urban only those places with 2,500 or more people located outside of urbanized areas. A note concerning data scale: Certain scale datasets are not suitable for some project, analysis, or modelling purposes. Please be sure you are using the best available data. 1:24000 scale datasets are recommended for projects that are at the county level. 1:24000 data should NOT be used for high accuracy base mapping such as property parcel boundaries. 1:100000 scale datasets are recommended for projects that are at the multi-county or regional level. 1:250000 scale datasets are recommended for projects that are at the regional or state level or larger. Vector datasets with no defined scale or accuracy should be considered suspect. Make sure you are familiar with your data before using it for projects or analyses. Every effort has been made to supply the user with data documentation. For additional information, see the References section and the Data Source Contact section of this documentation. For more information regarding scale and accuracy, see our web pages at: http://www.geoplan.ufl.edu/education.html These data are based on interpretation of available information and should not be construed as legally binding.
FGDL QUALITY ASSURANCE STATUS:
-Reprojected data to FGDL Albers HPGN (See "Map Projection Parameters" below) -Upcased all character records -Changed original name from "geo_2000_d_dec_00000_py_z1" to "ua2000" -Added items: POPULATION, POPDENSITY, and AREA -DESCRIPT item was added based on the item NAME
REFERENCES:
U.S. Census Bureau metadata: http://www.census.gov/geo/www/cob/ua_metadata.html
DATA LINEAGE SUMMARY:
In 2002, the GeoPlan Center downloaded this dataset in shapefile format from the U.S. Census Bureau website at: http://www.census.gov/geo/www/ua/ua_bdfile.html. When received, the data was in Geographic projection, Datum: NAD83, Spheroid: GRS1980, Units: Decimal degrees. Features located in the State of Florida were selected from the dataset and converted to a separate shapefile named "UA2000". This shapefile was then reprojected to FGDL Albers HPGN (See "Map Projection Parameters" below). The items P0PULATION, POPDENSITY, and AREA were added from the associated Census Bureau documentation found at http://www.census.gov/geo/www/tiger/tigerua/ua_tgr2k.html. The DESCRIPT item was added based on the item NAME and all character items within the attribute table were upcased.
MAP PROJECTION PARAMETERS:
Projection ALBERS Units METERS Datum HPGN Spheroid GRS1980 1st standard parallel 24 0 0.000 2nd standard parallel 31 30 0.000 Central meridian -84 0 0.000 Latitude of projection's origin 24 0 0.000 False easting (meters) 400000.00000 False northing (meters) 0.00000
DATA SOURCES CONTACT(S):
Name: U.S. Census Bureau Address: 8903 Presidential Parkway, Room 303 WP I Upper Marlboro, Maryland 20772 Phone: 301/457-1128 Web site: http://www.census.gov/geo/www/ua/ua_bdfile.html Email: tiger@census.gov
FGDL CONTACT:
Name: Florida Geographic Data Library Abbr. Name: FGDL Address: Florida Geographic Data Library 431 Architecture PO Box 115706 Gainesville, FL 32611-5706 Web site: http://www.fgdl.org Contact FGDL: Technical Support: http://www.fgdl.org/fgdlfeed.html FGDL Frequently Asked Questions: http://www.fgdl.org/fgdlfaq.html FGDL Mailing Lists: http://www.fgdl.org/fgdl-l.html For FGDL Software: http://www.fgdl.org/software.html