FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION
VERSION 2006
TITLE: US CENSUS BLOCK GROUPS - 1990
Geodataset Name: BLKGRP Geodataset Type: Shape Geodataset Feature: POLYGON
GENERAL DESCRIPTION:
This dataset contains census block groups as they are defined by the Bureau of the Census. Census block groups are geographic entities within the same census tract. Block groups usually contain between 250 and 550 housing units. Each block group covers a contiguous area. Each census tract contains at least one block group.
DATA SOURCE(S): U.S. Department of Commerce,
Bureau of the Census
SCALE OF ORIGINAL SOURCE MAPS: 1:100,000 DATE OF AUTOMATION OR SOURCE: Source 1990, Automated 1992 GEODATASET EXTENT: State of Florida
FEATURE ATTRIBUTE TABLES
Datafile Name: BLKGRP.DBF
ITEM NAME WIDTH TYPE PRECISION AREA 8 DECIMAL 5 PERIMETER 8 DECIMAL 5 BLKGRP_ 4 DECIMAL - BLKGRP_ID 4 DECIMAL - BKG_KEY 12 CHARACTER - BLKGRP 10 CHARACTER - FIPS 3 CHARACTER - TRACT 6 CHARACTER - BLOCKGRP 1 CHARACTER - POP1990 8 DECIMAL 0 POP90_SQMI 8 DECIMAL 1 HOUSEHOLDS 8 DECIMAL 0 MALES 8 DECIMAL 0 FEMALES 8 DECIMAL 0 WHITE 8 DECIMAL 0 BLACK 8 DECIMAL 0 AMERI_ES 4 DECIMAL - ASIAN_PI 8 DECIMAL 0 OTHER 8 DECIMAL 0 HISPANIC 8 DECIMAL 0 AGE_UNDER5 8 DECIMAL 0 AGE_5_17 8 DECIMAL 0 AGE_18_29 8 DECIMAL 0 AGE_30_49 8 DECIMAL 0 AGE_50_64 8 DECIMAL 0 AGE_65_UP 8 DECIMAL 0 NEVERMARRY 8 DECIMAL 0 MARRIED 8 DECIMAL 0 SEPARATED 4 DECIMAL - WIDOWED 8 DECIMAL 0 DIVORCED 8 DECIMAL 0 HSEHLD_1_M 8 DECIMAL 0 HSEHLD_1_F 8 DECIMAL 0 MARHH_CHD 8 DECIMAL 0 MARHH_NO_C 8 DECIMAL 0 MHH_CHILD 4 DECIMAL - FHH_CHILD 4 DECIMAL - HSE_UNITS 8 DECIMAL 0 VACANT 4 DECIMAL - OWNER_OCC 8 DECIMAL 0 RENTER_OCC 8 DECIMAL 0 MEDIAN_VAL 4 DECIMAL - MEDIANRENT 4 DECIMAL - UNITS_1DET 8 DECIMAL 0 UNITS_1ATT 4 DECIMAL - UNITS2 4 DECIMAL - UNITS3_9 8 DECIMAL 0 UNITS10_49 8 DECIMAL 0 UNITS50_UP 8 DECIMAL 0 MOBILEHOME 4 DECIMAL - TOTAL_VOTE 8 DECIMAL 0 WHITE_VOTE 8 DECIMAL 0 BLACK_VOTE 8 DECIMAL 0 OTHER_VOTE 8 DECIMAL 0 HSPNC_VOTE 8 DECIMAL 0 DESCRIPT 8 DECIMAL 0
FEATURE ATTRIBUTE TABLES CODES AND VALUES:
ITEM ITEM DESCRIPTION
BKG_KEY Code consisting of 12 characters. The first two characters are
the state FIPS code. The third through 5th characters are the
county FIPS code. The sixth through eleventh characters are the
census tract identification code. The last character is the
blockgroup within the census tract.
BLKGRP Tract and Block Group number.
FIPS County identification code.
TRACT Census tract number - all Block Groups are part of a
larger Census Tract.
BLOCKGRP Block group number.
POP1990 The total 1990 population for a tract.
POP90_SQMI The 1990 population per square mile for a state.
HOUSEHOLDS Total number of households.
MALES Number of males.
FEMALES Number of females.
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_PI Number of people identified as Asian or Pacific Islander.
OTHER Number of people identified as belonging to a race other than
white, black, American Indian, or Asian.
HISPANIC Number of people of all races identified as being of Hispanic
origin.
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_29 Number of people 18 to 29 years of age.
AGE_30_49 Number of people 30 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.
NEVERMARRY Number of people who have never married.
MARRIED Number of people who are married
SEPARATED Number of people who are separated from their spouse.
WIDOWED Number of people whose spouse died.
DIVORCED Number of people who are divorced.
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.
HSE_UNITS Total number of housing units.
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.
MEDIAN_VAL Median value of all housing units.
MEDIANRENT Median rent charged for all housing units that are rented.
UNITS_1DET Number of housing units with one detached unit in the structure.
UNITS_1ATT Number of housing units with one attached unit in the structure.
UNITS2 Number of housing units with two units in the structure.
UNITS3_9 Number of housing units with three to nine units in the
structure.
UNITS10_49 Number of housing units with 10 to 49 units in the structure.
UNITS50_up Number of housing units with 50 or more units in the structure.
MOBILEHOME Number of mobile homes or trailers.
TOTAL_VOTE The total number of voters or people of voting age.
WHITE_VOTE The total number of voters or people of voting age identified as
white.
BLACK_VOTE The total number of voters or people of voting age identified as
black.
OTHER_VOTE Number of voters or people of voting age identified as belonging
to a race other than white, black, or hispanic.
HSPNC_VOTE The total number of voters or people of voting age identified as
hispanic.
DESCRIPT FGDL added item containing total population numbers.
USER NOTES:
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 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
FGDL QUALITY ASSURANCE STATUS:
-Set tolerances to FGDL standards.
-Coverage renamed BLKGRP from BLKGRP-100
-Numerous sliver polygons dissolved, due to inconsistencies between the Tiger Line County boundaries and the FGDL/DEP County Boundaries.
REFERENCES:
DATA LINEAGE SUMMARY:
United States block group boundary data were provided by Geographic Data Technology, Inc. and are derived from the Bureau of the Census TIGER/Line files.
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 SOURCE 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
GIS gateway:
http://www.census.gov/geo/www/gis_gateway.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 Building
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