FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2006
TITLE: US CENSUS BLOCK GROUPS - 2000
Geodataset Name: BLKGRP2000 Geodataset Type: SHAPE Geodataset Feature: POLYGON
GENERAL DESCRIPTION:
This dataset contains 2000 Census Block Groups as they are defined by the Bureau of the Census. The data contains selected fields from the Summary 1 file that includes information on total population, race, sex, age, and household. Census Block Groups are geographic entities made up of Census Blocks and that are contained within the same Census Tract. Block Groups generally contain between 600 and 3,000 people, with an optimum size of 1,500 people.
DATA SOURCE(S): U.S. Department of Commerce, Bureau of the Census SCALE OF ORIGINAL SOURCE MAPS: 100,000 DATE OF AUTOMATION OR SOURCE: Source 2000, Automated 2003 GEODATASET EXTENT: State of FloridaFEATURE ATTRIBUTE TABLES:
Datafile Name: blkgrp2000.dbf ITEM NAME WIDTH TYPE PRECISION SHAPE 8 SHAPEPOLY 0 ID 8 DECIMAL 0 FIPSSTCO 5 CHARACTER 0 TRACT 6 CHARACTER 0 GROUP 1 CHARACTER 0 STFID 12 CHARACTER 0 OID_ 9 DECIMAL 0 STATE 2 CHARACTER 0 COUNTY 3 CHARACTER 0 TRACT_1 6 CHARACTER 0 BLKGRP 1 CHARACTER 0 STFID_1 12 CHARACTER 0 POP2000 9 DECIMAL 0 WHITE 9 DECIMAL 0 BLACK 9 DECIMAL 0 AMERI_ES 9 DECIMAL 0 ASIAN 9 DECIMAL 0 HAWN_PI 9 DECIMAL 0 OTHER 9 DECIMAL 0 MULT_RACE 9 DECIMAL 0 HISPANIC 9 DECIMAL 0 MALES 9 DECIMAL 0 FEMALES 9 DECIMAL 0 AGE_UNDER5 9 DECIMAL 0 AGE_5_17 9 DECIMAL 0 AGE_18_21 9 DECIMAL 0 AGE_22_29 9 DECIMAL 0 AGE_30_39 9 DECIMAL 0 AGE_40_49 9 DECIMAL 0 AGE_50_64 9 DECIMAL 0 AGE_65_UP 9 DECIMAL 0 MED_AGE 10 DECIMAL 1 MED_AGE_M 10 DECIMAL 1 MED_AGE_F 10 DECIMAL 1 HOUSEHOLDS 9 DECIMAL 0 AVE_HH_SZ 11 DECIMAL 2 HSEHLD_1_M 9 DECIMAL 0 HSEHLD_1_F 9 DECIMAL 0 MARHH_CHD 9 DECIMAL 0 MARHH_NO_C 9 DECIMAL 0 MHH_CHILD 9 DECIMAL 0 FHH_CHILD 9 DECIMAL 0 FAMILIES 9 DECIMAL 0 AVE_FAM_SZ 11 DECIMAL 2 HSE_UNITS 9 DECIMAL 0 URBAN 9 DECIMAL 0 RURAL 9 DECIMAL 0 VACANT 9 DECIMAL 0 OWNER_OCC 9 DECIMAL 0 RENTER_OCC 9 DECIMAL 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.
ID Internal identification number
FIPSSTCO County identification code.
TRACT Census tract number - all Block Groups are part of a larger Census
Tract.
GROUP Group
STFID State + County + Tract + Block FIPS
OID_ Internal ID number
STATE State (FIPS)
COUNTY County FIPS identification number
TRACT_1 Census Tract
BLKGRP Block group number.
STFID_1 State + County + Tract + Block FIPS
POP2000 The total 2000 population for a tract.
WHITE Number of people identified as white.
BLACK Number of people identified as black.
AMERI_ES Number of people identified as American Indian, Eskimo, or Aleut.
ASIAN Number of people identified as Asian
HAWN_PI Number of people identifided as Hawaiian or Pacific Islander.
OTHER Number of people identified as belonging to a race other than
white, black, American Indian, or Asian.
MULT_RACE Number of people identified as belonging to more than one race
HISPANIC Number of people of all races identified as being of Hispanic origin.
MALES Number of males.
FEMALES Number of females.
AGE_UNDER5 Number of people 0 to 4 years of age.
AGE_5_17 Number of people 5 to 17 years of age.
AGE_18_21 Number of people 18 to 21 years of age.
AGE_22_29 Number of people 22 to 29 years of age.
AGE_30_39 Number of people 30 to 39 years of age.
AGE_40_49 Number of people 40 to 49 years of age.
AGE_50_64 Number of people 50 to 64 years of age.
AGE_65_UP Number of people 65 years of age and over.
MED_AGE The median age of the entire population.
MED_AGE_M The median age of the male population.
MED_AGE_F The median age of the female population.
HOUSEHOLDS The number of households.
AVE_HH_SZ The average household size.
HSEHLD_1_M Number of one-person male households.
HSEHLD_1_F Number of one-person female households.
MARHH_CHD Number of households with a married couple and related children.
MARHH_NO_C Number of households with a married couple and no related children.
MHH_CHILD Number of households with a man and children but no wife.
FHH_CHILD Number of households with a woman and children but no husband.
FAMILIES Families
AVE_FAM_SZ Average family size
HSE_UNITS Total number of housing units.
URBAN Housing units urban
RURAL Housing units rural
VACANT Number of housing units that are vacant.
OWNER_OCC Number of housing units that are occupied by the owner.
RENTER_OCC Number of housing units that are occupied by renters.
USER NOTES:
Please note that the Summary 3 File data should not be joined with this dataset. It will work, however, comparing the population numbers for individual blockgroups could result in problems because of the nature of the sample. An error was built into the Summary 3 File that is desgined to protect the privacy of citizens. BLOCK GROUP (as defined by US Census Bureau) A block group consists of all census blocks having the same first digit of their four-digit identifying numbers within a census tract. For example, block group 3 (BG 3) within a census tract includes all blocks numbered from 3000 to 3999. BGs generally contain between 600 and 3,000 people, with an optimum size of 1,500 people. BGs on American Indian reservations, offreservation trust lands, and special places must contain a minimum of 300 people. (Special places include correctional institutions, military installations, college campuses, workers dormitories, hospitals, nursing homes, and group homes.) Most BGs were delineated by local participants as part of the U.S. Census Bureaus Participant Statistical Areas Program. The U.S. Census Bureau delineated BGs only where a local, state, or tribal government declined to participate or where the U.S. Census Bureau could not identify a potential local or tribal participant. BGs never cross the boundaries of states, counties, or statistically equivalent entities, except for a BG delineated by American Indian tribal authorities, and then only when tabulated within the American Indian hierarchy (see TRIBAL BLOCK GROUP). BGs never cross the boundaries of census tracts, but may cross the boundary of any other geographic entity required as a census block boundary (see CENSUS BLOCK). In decennial census data tabulations, a BG may be split to present data for every unique combination of American Indian area, Alaska Native area, Hawaiian home land, congressional district, county subdivision, place, voting district, or other tabulation entity shown in the data products. For example, if BG 3 is partly in a city and partly outside the city, there are separate tabulated records for each portion of BG 3. BGs are used in tabulating data nationwide, as was done for the 1990 census, for all block-numbered areas in the 1980 census, and for selected areas in the 1970 census. For data presentation purposes, BGs are a substitute for the enumeration districts (EDs) used for reporting data in many parts of the United States for the 1970 and 1980 censuses and in all areas before 1970. Also, BGs are the lowest level of the geographic hierarchy for which the U.S. Census Bureau tabulates and presents sample data. A note concerning data scale: Scale is an important factor in data usage. 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 multicounty 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
FGDL QUALITY ASSURANCE STATUS:
-Projected to FGDL Albers HPGN (See "Map Projection Parameters" below). -Merged all counties into a State extent -Joined table SF1 to blkgrp00.dbf based on attribute STFID
REFERENCES:
www.census.gov/prod/cen2000/doc/sf1.pdf
DATA LINEAGE SUMMARY:
Data was originally released by US Census Bureau in 2000. Data was downloaded by GeoPlan in shapefile format from ESRI (http://www.esri.com/data/download/census2000_tigerline/index.html). When received, data was in Geographic projection, Datum: NAD83, Spheroid: GRS1980, Units: Decimal degrees. The data was then projected to FGDL Albers HPGN (See "Map Projection Parameters" below).
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: UNITED STATES CENSUS BUREAU
Abbr. Name: USCB
Address: United States Census Bureau
Tiger Mapping Service
Washington, D.C. 20233
Phone: (301) 457-1128 (Geography)
(301) 457-4100 (Customer Service)
Web site: http://www.census.gov/ftp/pub/geo/www/tiger
ESRI Site:
http://www.esri.com/data/download/census2000_tigerline/index.html
E-mail: Tiger@census.gov
Contact Person: Products and Services Staff, Geography Division
Phone: (301) 457-1128
E-mail: 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