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

FEATURE ATTRIBUTE TABLES:
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