FLORIDA GEOGRAPHIC DATA LIBRARY DOCUMENTATION

TITLE: 2010 U.S. CENSUS BLOCK GROUPS IN FLORIDA (FILE GEODATABASE WITH ASSOCIATED REDISTRICTING TABLES)

Geodataset Name:       CENBLKGRP2010_SF_MAR11
Geodataset Type:       SHAPEFILE
Geodataset Feature:    Polygon
Feature Count:         11442
GENERAL DESCRIPTION:
This geodatabase includes a feature class containing the 2010 Census Block Groups spatial data and all associated tables from the 2010 Census Redistricting Data (P.L. 94-171) Summary File. Each table has an associated relationship class included in the GeoDatabase to help facilitate the identification, querying, relating, and joining of records while using the data within ArcMap. This data represents all available 2010 census population data available to date. Block Groups (BGs) are defined before tabulation block delineation and numbering, they are clusters of blocks within the same census tract that have the same first digit of their 4-digit census block number from the same decennial census.
DATA SOURCE(S):                    U.S. Department of Commerce, U.S. Census Bureau, Geography Division
SCALE OF ORIGINAL SOURCE MAPS:     Varies
GEODATASET EXTENT:                 State of Florida
PUBLICATION DATE: 2010 TIME PERIOD OF CONTENT: Begin Date: 201001 End Date: 201007 DOWNLOAD LINK: http://www.fgdl.org/metadataexplorer/explorer.jsp

FEATURE ATTRIBUTE TABLES:

Datafile Name: CENBLKGRP2010_SF_MAR11.DBF
ITEM NAME WIDTH TYPE
OBJECTID
4 OID
Shape
0 Geometry
STATEFP10
2 String
COUNTYFP10
3 String
TRACTCE10
6 String
BLKGRPCE10
1 String
GEOID10
12 String
NAMELSAD10
13 String
MTFCC10
5 String
FUNCSTAT10
1 String
ALAND10
8 Double
AWATER10
8 Double
INTPTLAT10
11 String
INTPTLON10
12 String
POP2010
4 Integer
Shape_Length
8 Double
Shape_Area
8 Double
FGDLAQDATE
8 Date

FEATURE ATTRIBUTE TABLES CODES AND VALUES:

Item
Item Description
OBJECTID Internal feature number.

Shape Feature geometry.

STATEFP10 2010 Census state Federal Information Processing Standards (FIPS) codes

COUNTYFP10 2010 Census county Federal Information Processing Standards (FIPS) code

TRACTCE10 2010 Census census tract code
000000 = Water tract in some coastal and Great Lakes water and territorial sea

000100 to 998999 = Census tract number


BLKGRPCE10 2010 Census block group number
0 = Water block group

1 to 9 = Census 2000 block group code


GEOID10 Census block group identifier; a concatenation of 2010 Census state Federal Information Processing Standards (FIPS) code, county FIPS code, census tract code, and block group number

NAMELSAD10 2010 Census translated legal/statistical area description and the block group number

MTFCC10 MAF/TIGER feature class code
G5030 = Block Group


FUNCSTAT10 2010 Census functional status
S = Statistical entity


ALAND10 2010 Census land area (square meters)
0 to 9,999,999,999,999 = Blank


AWATER10 2010 Census water area (square meters)
0 to 9,999,999,999,999 = Blank


INTPTLAT10 2010 Census latitude of the internal point
00 = Blank


INTPTLON10 2010 Census longitude of the internal point
00 = Blank


POP2010 Total population

Shape_Length Length of feature in internal units.

Shape_Area Area of feature in internal units squared.

FGDLAQDATE Date FGDL acquired the data

This geodatabase contains one feature class representing the 2010 census block groups, 
five tables of redistricing housing and population data, and five relationship classes 
linking the tables to the census block groups feature class. 


GEODATABASE CONTENTS:


Spatial Data:


cenblkgrp2010_sf_mar11 - Feature class with 2010 Florida census block groups


Tabular Data: 


redis_h1 - Tabular housing data on total number of housing units and 
                 occupancy status from redistricting summary file. This table 
                 can be joined to census block groups feature class 
                 (cenblkgrp2010_sf_mar11) on the GEOID10 field.


redis_p1 - Tabular population data on race and total population from 
                 redistricting summary file. This table can be joined to the 
                 census block groups feature class (cenblkgrp2010_sf_mar11)
                 on the GEOID10 field.


redis_p2 - Tabular population data on hispanic population and race from 
                 redistricting summary file. This table can be joined to the 
                 census block groups feature class (cenblkgrp2010_sf_mar11)
                 on the GEOID10 field. 


redis_p3 - Tabular population data on the population over 18 years of 
                 age from redistricting summary file. This table can be joined 
                 to the census block groups feature class (cenblkgrp2010_sf_mar11)
                 on the GEOID10 field.


redis_p4 - Tabular population data on the population over 18 by hispanic 
                 origin and race from redistricting summary file. This table can 
                 be joined to the census block groups feature class 
                 (cenblkgrp2010_sf_mar11) on the GEOID10 field.



Relationship Classes:


cenblkgrp2010_redis_h1 - Relationship class to link population data in 
                                          redis_h1 table to the census block groups feature class 
                      	          (cenblkgrp2010_sf_mar11).  Link is based on GEOID10 field. 


cenblkgrp2010_redis_p1 - Relationship class to link population data in 
                      	          redis_p1 table to the census block groups feature class 
                      	          (cenblkgrp2010_sf_mar11).  Link is based on GEOID10 field. 


cenblkgrp2010_redis_p2 - Relationship class to link population data in 
                      	          redis_p2 table to the census block groups feature class 
                                          (cenblkgrp2010_sf_mar11).  Link is based on GEOID10 field. 


cenblkgrp2010_redis_p3 - Relationship class to link population data in 
                      	          redis_p3 table to the census block groups feature class 
                      	          (cenblkgrp2010_sf_mar11).  Link is based on GEOID10 field. 


cenblkgrp2010_redis_p4 - Relationship class to link population data in 
                                          redis_p4 table to the census block groups feature class 
                      	          (cenblkgrp2010_sf_mar11).  Link is based on GEOID10 field.
USER NOTES:
The Census Bureau performed automated tests to ensure 
logical consistency and limits of shapefiles.  Segments 
making up the outer and inner boundaries of a polygon 
tie end-to-end to completely enclose the area.  All polygons 
are tested for closure.
The Census Bureau uses its internally developed geographic 
update system to enhance and modify spatial and attribute 
data in the Census MAF/TIGER database.  Standard geographic 
codes, such as FIPS codes for states, counties, municipalities, 
county subdivisions, places, American Indian/Alaska Native/Native 
Hawaiian areas, and congressional districts are used when encoding 
spatial entities.  The Census Bureau performed spatial data tests 
for logical consistency of the codes during the compilation of the 
original Census MAF/TIGER database files.  Most of the codes for 
geographic entities except states, counties, urban areas, Core Based 
Statistical Areas (CBSAs), American Indian Areas (AIAs), and congressional 
districts were provided to the Census Bureau by the USGS, the agency 
responsible for maintaining FIPS 55.  Feature attribute information 
has been examined but has not been fully tested for consistency.
For the TIGER/Line Shapefiles, the Point and Vector Object Count for 
the G-polygon SDTS Point and Vector Object Type reflects the number of 
records in the shapefile attribute table.  For multi-polygon features, 
only one attribute record exists for each multi-polygon rather than 
one attribute record per individual G-polygon component of the multi-polygon 
feature.  TIGER/Line Shapefile multi-polygons are an exception to the 
G-polygon object type classification.  Therefore, when multi-polygons 
exist in a shapefile, the object count will be less than the actual 
number of G-polygons.
Data completeness of the TIGER/Line Shapefiles reflects 
the contents of the Census MAF/TIGER database at the 
time the TIGER/Line Shapefiles were created.
GeoPlan relied on the integrity of the attribute information within
the original data.
This dataset contains 2010 Census Block Groups, which are an extract of 
selected geographic and cartographic information from the U.S. Census 
Bureau's Master Address File / Topologically Integrated Geographic Encoding 
and Referencing (MAF/TIGER) Database (MTDB).  

Block Groups (BGs) are defined before tabulation block delineation and 
numbering, but are clusters of blocks within the same census tract that have the 
same first digit of their 4-digit census block number from the same decennial 
census. For example, Census 2000 tabulation blocks 3001, 3002, 3003,.., 3999 
within Census 2000 tract 1210.02 are also within BG 3 within that census tract. 

2000 Census Block Groups generally contained between 600 and 3,000 people, 
with an optimum size of 1,500 people.   Within the standard census geographic 
hierarchy, BGs never cross county or census tract boundaries, but may cross the 
boundaries of other geographic entities like county subdivisions, places, urban 
areas, voting districts, congressional districts, and American Indian / Alaska 
Native / Native Hawaiian areas.

Most BGs were delineated by local participants in the Census Bureau's Participant 
Statistical Areas Program (PSAP).  The Census Bureau delineated BGs only where 
the PSAP participant declined to delineate BGs or where the Census Bureau 
could not identify any local PSAP participant.  A BG usually covers a contiguous 
area.  Each census tract contains at least one BG, and BGs are uniquely 
numbered within census tract. 

BGs have a valid code range of 0 through 9.  BGs coded 0 were intended to only 
include water area, no land area, and they are generally in territorial seas, coastal 
water, and Great Lakes water areas.  For Census 2000, rather than extending a 
census tract boundary into the Great Lakes or out to the U.S. nautical three-mile 
limit, the Census Bureau delineated some census tract boundaries along the 
shoreline or just offshore.  The Census Bureau assigned a default census tract 
number of 0 and BG of 0 to these offshore, water-only areas not included in 
regularly numbered census tract areas.

To analyze demographic and census data from the 2010 U.S. Census.

This data is provided 'as is' and its horizontal positional accuracy
has not been verified by GeoPlan

This data is provided 'as is' and its vertical positional accuracy
has not been verified by GeoPlan

The TIGER/Line Shapefile products are not copyrighted however 
TIGER/Line and Census TIGER are registered trademarks of the 
U.S. Census Bureau.  These products are free to use in a product 
or publication, however acknowledgement must be given to the U.S. 
Census Bureau as the source.

The boundary information in the TIGER/Line Shapefiles are for 
statistical data collection and tabulation purposes only; their 
depiction and designation for statistical purposes does not constitute 
a determination of jurisdictional authority or rights of ownership 
or entitlement and they are not legal land descriptions. Coordinates 
in the TIGER/Line shapefiles have six implied decimal places, but 
the positional accuracy of these coordinates is not as great as the 
six decimal places suggest.

The Florida Geographic Data Library is a collection of Geospatial Data
compiled by the University of Florida GeoPlan Center with support from
the Florida Department of Transportation. GIS data available in FGDL is
collected from various state, federal, and other agencies (data sources)
who are data stewards, producers, or publishers. The data available in
FGDL may not be the most current version of the data offered by the
data source. University of Florida GeoPlan Center makes no guarantees
about the currentness of the data and suggests that data users check
with the data source to see if more recent versions of the data exist.

Furthermore, the GIS data available in the FGDL are provided 'as is'.
The University of Florida GeoPlan Center makes no warranties, guaranties
or representations as to the truth, accuracy or completeness of the data
provided by the data sources. The University of Florida GeoPlan Center
makes no representations or warranties about the quality or suitability
of the materials, either expressly or implied, including but not limited
to any implied warranties of merchantability, fitness for a particular
purpose, or non-infringement. The University of Florida GeoPlan Center
shall not be liable for any damages suffered as a result of using,
modifying, contributing or distributing the materials.

A note about data scale: 

Scale is an important factor in data usage.  Certain scale datasets
are not suitable for some project, analysis, or modeling 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.
1:125000 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 analysis. 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 webpage at:
http://geoplan.ufl.edu/education.html

REFERENCES:
Technical Documentation - Redistricting Data
http://www.census.gov/prod/cen2010/doc/nsfrd.pdf

DATA LINEAGE SUMMARY:
TIGER/Line Shapefiles are extracted from the Census MAF/TIGER 
database by nation, state, county, and entity.  Census 
MAF/TIGER data for all of the aforementioned geographic 
entities are then distributed among the shapefiles each 
containing attributes for line, polygon, or landmark geographic data.
Process Date: 2010

GeoPlan downloaded the Redistricting Summary File from the Census in .pl format: http://www2.census.gov/census_2010/01-Redistricting_File--PL_94-171/Florida/ The database was compiled using the process steps in http://www.census.gov/rdo/pdf/0HowToUseMicrosoftAccessShells.pdf The 2010 TIGER line files were downloaded from the following site: http://www.census.gov/geo/www/tiger/tgrshp2010/tgrshp2010.html When received the data was in Geographic Lat/Long projection. The data was projected to Albers HPGN. The following QAQC procedures were performed: - exported original shapefile to file GeoDatabase - Added field FGDLAQDATE based on date GeoPlan acquired data from Census Bureau - Changed file name from tl_2010_12_bg10.shp to CENBLKGRP2010_SF_MAR11 Process Date: 20110405
MAP PROJECTION PARAMETERS:

Projection                          ALBERS
Datum                               HPGN
Units                               METERS
Spheroid                            GRS1980
1st Standard Parallel               24  0  0.000
2nd Standard Parallel               31 30  0.000
Central Meridian                   -84 00  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:
Abbr. Name:
Address:


Phone:

Web site:
E-mail:
Contact Person:
         Phone:
        E-mail:
U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Branch
MAF/TIGER
4600 Silver Hill Road, Stop 7400
Washington, DC
20233-7400
301-763-1128

http://www.census.gov/geo/www/tiger geo.tiger@census.gov REQUIRED: The person responsible for the metadata information.

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