Metadata Record Dublin Core Standard Title: Census 2000 Block Data Catalog Name: California Department of Forestry and Fire Protection OID: 715 CITATION INFORMATION Identifier: cen00bl Title: Census 2000 Block Data Originator: California Department of Forestry and Fire Protection Publication Date: 2002 Edition: 02_1 Information Resource Type Format: Computer file Content: Geographic information system Scale: 1:100,000 Other Citation Details: Map projection is Albers Equal Area, NAD27 IDENTIFICATION INFORMATION Abstract: Census 2000 Block Data provides a seamless statewide GIS layer of census blocks with associated attributes . Browse Graphic URL: http://frap.cdf.ca.gov/data/browsegraphic/cenbl2000.gif Purpose: The California Mapping Coordinating Committee identified the need for a single standard statewide source for 2000 census block data. The original 2000 Census TIGER data is distributed by county. The county boundaries do not match USGS county linework but do edgematch seamlessly. CDF, working under direction of CMCC, merged all county files into a single statewide data layer. Supplemental Info: Additional details on processing methods provided in data dictionary Time Period Start: 1/1/2000 Time Period End: 12/31/2000 Currentness: Publication Date Progress: Complete Update Frequency: As Needed Place: California Geographic Region West: -124 Geographic Region East: -114 Geographic Region North: 42 Geographic Region South: 32 Themes: Census districts, Census areas, Population, Demographics, People User Keywords: census blocks Access Limitations: No Restrictions Use Limitations: FRAP disclaimer Read disclaimer within data dictionary supplied when data are downloaded from FRAP site Contact Information Data Contact: FRAP Development Modeling Specilaist Organization: CDF-FRAP Phone: 916-445-5373 Fax: 916-324-1180 Email: Shawn.Saving@fire.ca.gov Url: http://frap.cdf.ca.gov/ Address: 1920 20th Street 1920 20th Street City: Sacramento State: California Postal Code: 95814 Country: USA DISTRIBUTION INFORMATION Online Linkage: http://frap.cdf.ca.gov/data.html Size (MB): 307 Distribution Format: ARC/INFO Export Ordering Instructions: Obtain on-line or request through distribution contact Contact Information Distribution Contact: FRAP data librarian Organization: CDF-FRAP Phone: 916-445-5342 Fax: 916-324-1180 Url: http://frap.cdf.ca.gov Address: 1920 20th Street 1920 20th Street City: Sacramento State: California Postal Code: 95814 Country: USA METADATA INFORMATION Date: 4/30/2004 Contact Information Metadata Contact: FRAP Development Modeling Specilaist Organization: CDF-FRAP Phone: 916-445-5373 Fax: 916-324-1180 Email: Shawn.Saving@fire.ca.gov Url: http://frap.cdf.ca.gov/ Address: 1920 20th Street 1920 20th Street City: Sacramento State: California Postal Code: 95814 Country: USA DATA DICTIONARY FEATURE TYPE: polygon and line NOTES: The original Census TIGER linework is distributed by county. The county boundaries do not match USGS county linework but do edgematch seamlessly with each other. We imported data in Decimal Degrees to maintain the original coordinates. Before further processing, the fuzzy tolerance was set to 0.000000000001. We dissolved the coverage on the items FIPS_CTBL and WATER to remove TIGER roads and streams that split census blocks into multiple polygons. Although most polygonal water features have unique FIPS_CTBL codes, some share their code with a block and therefore cannot be uniquely identified. Remaining extraneous arcs (dangles) were removed by selecting those arcs where LPOLY# was the same as RPOLY#. We detected no slivers after mapjoining and the number of unique census blocks in the final coverage matches the official number from the Census Bureau. We projected the entire statewide coverage into Teale Albers projection. Data from the SF1 file joined to the .PAT with no unmatched records. Some block boundary arcs are hydrography or road features. We maintained the TLID from TIGER so that the arcs can be linked to the arc feature databases. Because adjacent counties had duplicate county arcs, only one arc was maintained and attributes from the two arcs were merged. The remaining arc was assigned a NEW_TLID (the negative ID of one of the original arcs). This new ID will be relatable to the statewide TIGER Hydro and Roads coverages when those are complete. DATABASE FIELDS: polygon INPUT OUTPUT DATA DECI FIELD NAME WIDTH WIDTH TYPE MALS DESCRIPTION ---------- ----- ------ ---- ---- ------------------------------- AREA 8 18 F 5 - PERIMETER 8 18 F 5 - CEN00BL02_1# 4 5 B - - CEN00BL02_1-ID 4 5 B - - LOGRECNO 7 7 C - Unique ID for linking to SF1 data FIPS_CTBL 15 15 C - Full unique identifier for CA COUSUB 5 5 C - Primary county divisions PLACE 5 5 I - FIPS populated place identifier PLACE_NAME 65 65 C - Name of Census populated place PLACE_TYPE 4 4 C - CDP, CITY, or TOWN UR 1 1 C - U = Urbanized Area; R = Rural Area UA 5 5 C - Urbanized Area identifier UA_NAME 55 55 C - Name of Census Urbanized Area UA_TYPE 1 1 C - U- Urbanized Area; C - Urban Cluster POP100 4 10 B - Enumerated population from SF1 file HU100 4 10 B - Enumerated housing units from SF1 POP100_DENS 8 12 F 2 Persons per square mile of land per block HU100_DENS 8 12 F 2 Housing Units per square mile of land per block DENCLASS10 2 2 I - Housing density class (see below) AREALAND 8 12 F 2 Area in sq. mi. of block on land from SF1* AREAWATR 8 12 F 2 Area in sq. mi. of block in water from SF1 WATER 1 1 I - 1 = Water; 0 = Land ** REDEFINED ITEMS ** STATE 2 2 C - 2 character FIPS State code COUNTY 3 3 C - 3 character FIPS County code TRACT 6 6 C - 6 character TRACT code BLOCK_GROUP 1 1 C - 1 character BLOCK GROUP code BLOCK 3 3 C - 3 character BLOCK code * AREALAND contains the area of the entire block (unique LOGRECNO). Thus, if the block is composed of two or more polygons, AREALAND will not agree with the calculated AREA measurement of the individual polygons. Units for AREALAND and AREAWATR have been converted to square miles from the original square meters in the SF1 table. FIELD NAME: LOGRECNO and FIPS_CTBL Unique identifier for the smallest statistical and geographic unit captured by Census. FIPS_CTBL is a concatenation of FIPS STATE CODE + COUNTY FIPS CODE + TRACT CODE + BLOCKGROUP CODE + BLOCK CODE. FIPS_CTBL has a one to one relationship with LOGRECNO. LOGRECNO is the unique key field used by Census in the SF1 attribute table. FIELD NAME: COUSUB County subdivisions are the primary divisions of counties and statistically equivalent entities for data presentation purposes. They include census county divisions, census subareas, minor civil divisions (MCDs), unorganized territories, and incorporated places that are independent of any MCD. Each county subdivision is assigned a five-digit Federal Information Processing Standards (FIPS) code in alphabetical order within each state. FIELD NAME: PLACE Places, for the reporting of decennial census data, include census designated places (CDP), consolidated cities, and incorporated places. Each place is assigned a five-digit Federal Information Processing Standards (FIPS) code in alphabetical order within each state. For more information see http://www.census.gov/geo/www/cob/pl_metadata.html FIELD NAME: PLACE_NAME and PLACE_TYPE PLACE_NAME and PLACE_TYPE were pulled from the Census data file http://www.census.gov/geo/www/gazetteer/places2k.zip. The terms 'CDP', 'city', and 'town' were removed from the NAME field of this table and placed into the PLACE_TYPE field. For more information see http://www.census.gov/geo/www/gazetteer/places2k.html FIELD NAME: UA For Census 2000, the Census Bureau classifies as "urban" all territory, population, and housing units located within an urbanized area (UA) or an urban cluster (UC). It delineates UA and UC boundaries to encompass densely settled territory, which consists of: - core census block groups or blocks that have a population density of at least 1,000 people per square mile and - surrounding census blocks that have an overall density of at least 500 people per square mile In addition, under certain conditions, less densely settled territory may be part of each UA or UC. The Census Bureau's classification of "rural" consists of all territory, population, and housing units located outside of UAs and UCs. The rural component contains both place and nonplace territory. Geographic entities, such as census tracts, counties, metropolitan areas, and the territory outside metropolitan areas, often are "split" between urban and rural territory, and the population and housing units they contain often are partly classified as urban and partly classified as rural. Each place is assigned a five-digit Federal Information Processing Standards (FIPS) code in alphabetical order for the entire U.S. For more information see http://www.census.gov/geo/www/ua/ua_2k.html FIELD NAME: UA_NAME and UA_TYPE UA_NAME and UA_TYPE were derived from the Census data files http://www.census.gov/geo/www/ua/uc_state_corr.txt and http://www.census.gov/geo/www/ua/ua_state_corr.txt. FIELD NAME: DENCLASS10 DENCLASS10 HOUSING DENSITY -------- --------------- 1 NONE 2 LESS THAN 1 UNIT PER 160 ACRES (< 4 / Sq. mi.) 3 1 UNIT PER 160 ACRES TO 1 UNIT PER 40 ACRES (4 - 16 / Sq mi) 4 1 UNIT PER 40 ACRES TO 1 UNIT PER 20 ACRES (16 - 32 / Sq mi) 5 1 UNIT PER 20 ACRES TO 1 UNIT PER 10 ACRES (32 - 64 / Sq mi) 6 1 UNIT PER 10 ACRES TO 1 UNIT PER 5 ACRES (64 - 128 / Sq mi) 7 1 UNIT PER 5 ACRES TO 1 UNIT PER 1 ACRE (128 - 640 / Sq mi) 8 1 UNIT PER 1 ACRE TO 2 UNITS PER ACRE (640 - 1280 / Sq mi) 9 2 UNITS PER 1 ACRE TO 5 UNITS PER ACRE (1280 - 3200 / Sq mi) 10 GREATER THAN OR EQUAL TO 5 UNITS PER ACRE (>= 3200 / Sq mi) DATABASE FIELDS: line INPUT OUTPUT DATA DECI ITEM NAME WIDTH WIDTH TYPE MALS DESCRIPTION ---------- ----- ------ ---- ---- ---------------------------------- FNODE# 4 5 B - - TNODE# 4 5 B - - LPOLY# 4 5 B - - RPOLY# 4 5 B - - LENGTH 7 18 F 5 - CEN00BL02_1# 4 5 B - - CEN00BL02_1-ID 4 5 B - - TLID 10 10 I - Original ID for arc features (hydro and roads) NEW_TLID 10 10 I - New ID for arc features, equal to TLID except for county boundaries (see Notes). COORDINATE SYSTEM DESCRIPTION Projection ALBERS Datum NAD27 Units METERS Spheroid CLARKE1866 Parameters: 1st standard parallel 34 0 0.000 2nd standard parallel 40 30 0.000 central meridian -120 0 0.00 latitude of projection's origin 0 0 0.000 false easting (meters) 0.00000 false northing (meters) -4000000.0000 DISCLAIMER The State of California and the Department of Forestry and Fire Protection make no representations or warranties regarding the accuracy of data or maps. The user will not seek to hold the State or the Department liable under any circumstances for any damages with respect to any claim by the user or any third party on account of or arising from the use of data or maps. The user will cite the Department of Forestry and Fire Protection as the original source of the data, but will clearly denote cases where the original data have been updated, modified, or in any way altered from the original condition. There are no restrictions on distribution of the data by users. However, users are encouraged to refer others to the Department of Forestry and Fire Protection to acquire the data, in case updated data become available.