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UA Census Hydrographic Features, 2000 - Alabama

Identification Information
Citation
Originator
U.S. Department of Commerce, Bureau of the Census, Geography Division
Publication Date
2002
Title
UA Census Hydrographic Features, 2000 - Alabama
Edition
UA Census 2000
Geospatial Data Presentation Form
vector digital data
Collection Title
TIGER/Line Files, UA Census 2000
Publication Information
Online Linkage
https://hgl.harvard.edu/catalog/harvard-tg00allkh
Abstract
This datalayer displays the hydrographic features throughout the state. This category includes shorelines of all water regardless of the classification of the water itself. Predominant features which may be represented in this layer have Census Feature Class Code Major and Minor Descriptor (CFCC2 ) values of: H0 (Water feature, classification unknown or not elsewhere classified) H1 (Naturally Flowing Water Features: streams, rivers) H2 (Man-Made Channel to Transport Water or features used for purposes such as transportation, irrigation, or navigation: canals, ditches, or aqueducts) H3 (Inland Body of Water: lake or pond) H4 (Man-Made Body of Water: reservoir) H5 (Seaward Body of Water: Bay, estuary, gulf, sound, sea, or ocean) H6 (Body of Water in a Man-Made Excavation: flooded gravel pit) H7 (Nonvisible Definition Between Water Bodies. The Census Bureau digitizes nonvisible definition boundaries to separate named water areas; for instance, an artificial boundary is drawn to separate a named river from the connecting bay) H8 (Special Water Feature: Includes area covered by glaciers or snow fields) The Feature Name attribute further identifies water bodies as rivers, reservoirs, creeks, branches, forks, etc.
Purpose
These data are intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production. This layer will provide a basemap for layers related to hydrographic analysis, statistical enumeration and analysis, or to support graphical overlays and analysis with other spatial data. More advanced user applications may focus on land use planning, hydrologic analysis and related areas (including defining boundaries, managing assets and facilities, integrating attribute databases with geographic features, spatial analysis, and presentation output.)
Supplemental Information
The UA Census 2000 TIGER/Line files are extracts of selected geographic and cartographic information from the Census TIGER (Topologically Integrated Geographic Encoding and Referencing) database. The geographic coverage for a single TIGER/Line file is a county or statistical equivalent entity, with the coverage area based either on January 1, 2000 or January 1, 1990 legal boundaries. The Census TIGER database represents a seamless national file with no overlaps or gaps between parts. However, each county-based TIGER/Line file is designed to stand alone as an independent data set or the files can be combined to cover the whole nation and its territories. The UA Census 2000 TIGER/Line files consist of line segments representing physical features and governmental and statistical boundaries. The boundary information in the TIGER/Line files 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. The files contain information distributed over a series of record types for the spatial objects of a county. There are 17 record types, including the basic data record, the shape coordinate points, and geographic codes that can be used with appropriate software to prepare maps. Other geographic information contained in the files includes attributes such as feature identifiers/census feature class codes (CFCC) used to differentiate feature types, address ranges and ZIP Codes, codes for legal and statistical entities, latitude/longitude coordinates of linear and point features, landmark point features, area landmarks, key geographic features, and area boundaries. The UA Census 2000 TIGER/Line data dictionary contains a complete list of all the fields in the 17 record types. NOTE: Portions of this metadata file have been copied directly from Census documentation. For additional information on this or other layers in the UA Census 2000 TIGER dataset please consult the U.S. Census Bureau's technical documentation at: http://www.census.gov/geo/www/tiger/tigerua/ua2ktgr.pdf
Temporal Extent
Currentness Reference
ground condition
Time Instant
20000101
Bounding Box
West
-88.4729600006261
East
-84.8889669995051
North
35.007882
South
30.144425
ISO Topic Category
inlandWaters
Theme Keyword
Census
Hydrography
Hydrology
Rivers
Reservoirs
Shorelines
Water
Theme Keyword Thesaurus
LCSH
Theme Keyword
Hydrographic Features
Theme Keyword Thesaurus
None
Place Keyword
Alabama
Place Keyword Thesaurus
GNIS
Temporal Keyword
Access Restrictions
None
Use Restrictions
For educational, non-commercial use only. TIGER, TIGER/Line, and Census TIGER are trademarks of the Bureau of the Census. Although this data set has been developed by the U.S. Census Bureau, no warranty expressed or implied is made by the Bureau as to the accuracy of the data and related materials. The act of distribution shall not constitute any such warranty, and no responsibility is assumed by the Bureau in the use of this data, or related materials.
Status
Complete
Maintenance and Update Frequency
Datalayers derived from TIGER/Line files are extracted from the Census TIGER data base when needed for geographic programs required to support the census and survey programs of the Census Bureau. No changes or updates will be made to the UA Census 2000 TIGER/Line files.
Point of Contact
Contact Organization
U.S. Department of Commerce, Bureau of the Census, Geography Division
Delivery Point
8903 Presidential Pkwy, Room 303 WP I
Delivery Point
Bureau of the Census
Delivery Point
4700 Silver Hill Road, Stop 7400
City
Upper Marlboro
City
Washington
State
Maryland
State
District of Columbia
Postal Code
20772
Postal Code
20233-7400
Country
USA
Country
USA
Contact Telephone
1-301-457-1128
Contact Facsimile Telephone
1-301-457-4710
Contact Electronic Mail Address
tiger@census.gov
Hours of Service
Monday through Friday 8:30 A.M. to 4:30 P.M. EST-USA
Credit
U.S. Department of Commerce, Bureau of the Census, Geography Division.
Native Data Set Environment
Microsoft Windows NT Version 4.0 (Build 1381) Service Pack 6; ESRI ArcCatalog 8.2.0.700
Collection
Originator
U.S. Department of Commerce, Bureau of the Census, Geography Division
Publication Date
2002
Title
TIGER/Line Files, UA Census 2000
Edition
UA Census 2000
Publication Information
Publication Place
Washington, DC
Publisher
U.S. Department of Commerce, Bureau of the Census
Data Quality Information
Attribute Accuracy Report
Topological Properties The attribute accuracy of the TIGER/Line files is as precise as the source used during the creation or update of the Census TIGER database. Accuracy statements on the Census TIGER database are based on deductive estimates; no specific field tests for attribute accuracy have been conducted on the files. However, updates or corrections resulting from normal U.S. Census Bureau field operations are entered into the Census TIGER database. In addition, quality checks are conducted to verify clerical transcription of data from source materials. Based on past experience, attribute codes match the source materials with less than a two-percent error. The feature network of complete chains (as represented by Record Types 1 and 2) is complete for census purposes. Data users should be aware that on occasion they might not be able to trace a specific feature by name or by census feature class code (CFCC) as a continuous line throughout the TIGER/Line files without making additional edits. For example, State Highway 32 may cross the entire county. The TIGER/Line files will contain complete chains in the file at the location of State Highway 32, but the complete chains may individually have one of a collection of local names such as S Elm Street, or Smallville Highway, with or without State Highway 32 as an alternate. The most frequent CFCC for a state highway is A21, but the complete chains at the location of State Highway 32 may have a variety of class codes such as A01, A41, or A21. Recent edits have reduced this problem, but not eliminated it. Boundaries and Geographic Entity Codes The U.S. Census Bureau collects and tabulates information for both legal and statistical entities. Record Type 1 mainly identifies the boundaries and codes for the legal entities reported to the U.S. Census Bureau to be legally in effect as of the Census 2000 Boundary and Annexation Survey. Record Types 3 and A generally contain the 1990 census tabulation geographic boundaries and codes for those entities. Most legal boundaries are based on the annotations made by local officials in response to the U.S. Census Bureau's Boundary and Annexation Surveys. The boundary information in the TIGER/Line files 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. Local data users generally define and delineate statistical entities following U.S. Census Bureau guidelines. However, there are several exceptions: - The U.S. Census Bureau defines Urbanized Areas (UAs) based strictly on technical considerations. USGS edited the FIPS 55 file to ensure alphabetical sorting and data consistency. As a result, changes were made to the FIPS 55 codes and related class codes. These changes, plus codes for new Census 2000 entities, appear in Record Type C. Other attribute data in the TIGER/Line files were gathered from many sources. The U.S. Census Bureau's staff linked the attribute information to the spatial framework of features. Most procedures for gathering the needed attributes were clerical. The quality of these attributes was ensured by various tests conducted before, during, and after the time that the attribute information was entered into the Census TIGER database. Tests included source material selection and evaluation checks, quality control checks on staff work, independent reviews by local and tribal leaders of maps produced from the Census TIGER database, and staff reviews of computer-performed operations. - The U.S. Census Bureau defines ZIP Code Tabulation Areas (ZCTAs) through an automated process utilizing addresses in the TIGER database and the Master Address File (MAF). - State Departments of Education delineate school districts. - The designated liaison for the Redistricting Data Program supplies Voting Districts (VTDs) and State Legislative Districts (SLDs). - Metropolitan Planning Organizations or State Departments of Transportation define Traffic Analysis Zones (TAZs). The USGS maintains the file that is published as FIPS 55. The U.S. Census Bureau uses the file for coding American Indian/Alaska Native Areas, county subdivisions, consolidated cities, places, and sub-MCDs. Address Ranges and ZIP Codes The conversion from the Geographic Base File/Dual Independent Map Encoding (GBF/DIME)-Files to the TIGER format involved neither verification of previously existing address ranges nor any significant updates or corrections. Prior to the release of the 1992 TIGER/Line files, the address ranges for an area were generally the same as those in the corresponding 1980 GBF/DIME-File. The 1992 TIGER/Line files included ACF address ranges for existing and new features identified during census operations. Address ranges and ZIP Codes were verified and coverage extended for Census 2000 through the use of the Master Address File (MAF). The MAF is closely linked to the Census TIGER database. Local address lists and addresses from the U.S. Postal Service supplement the MAF. Through an automated matching process, addresses in the MAF were compared to existing address ranges in the Census TIGER database creating or modifying the TIGER address ranges where necessary. Feature Identifiers A national consistency review of all feature names in the Census TIGER database was performed by running a revised name standardizing operation on all feature identifiers. An additional benefit was the removal of nonstandard characters and punctuation from the names. To improve accuracy, road names in the Census TIGER database were compared with street names in the ZIP+4 file from the US Postal Service. Errors in feature directionals or feature types were corrected in the Census TIGER database.
Logical Consistency Report
Node-line-area relationships satisfy topological requirements. These requirements include the following: - Complete chains must begin and end at nodes. - Complete chains must connect to each other at nodes. - Complete chains do not extend through nodes. - Left and right polygons are defined for each complete chain element and are consistent for complete chains connecting at nodes. - Complete chains representing the limits of a file are free from gaps. The U.S. Census Bureau performed automated tests to ensure logical consistency and limits of file. Some polygons in the TIGER/Line files are so small that the polygon internal point has been manually placed on a node that defines the polygon perimeter. The U.S. Census Bureau uses it's internally developed Geographic Update System to enhance and modify spatial and attribute data in the Census TIGER database. The Census TIGER database has two generations of currency in geographic areas. These are the 1990 census areas and the Census 2000 areas. The location, type, and number of areas affect the boundaries of geographic areas. To prepare for Census 2000, those features used only as boundaries in the 1980 census were deleted. The deletions lowered the overall count of complete chains and polygons. Standard geographic codes, such as FIPS codes for states, counties, municipalities, and places, are used when encoding spatial entities. The U.S. Census Bureau performed spatial data tests for logical consistency of the codes during the compilation of the original Census TIGER database files. Most of the codes themselves were provided to the U.S. Census Bureau by the U.S. Geological Survey (USGS), the agency responsible for maintaining FIPS 55.
Completeness Report
Data completeness of the TIGER/Line files reflects the contents of the Census TIGER data base at the time the TIGER/Line files (UA 2000 version) were created. The GBF/DIME-Files and the USGS's DLG were the two main sources of spatial attribute data. Data for a given category contain attribute codes that reflect the information portrayed on the original source. The TIGER/Line files also use the U.S. Census Bureau's internal coding scheme which in some cases parallels the FIPS codes. The feature network of complete chains is complete for census purposes. For the 1990 census and Census 2000, census enumerators identified new and previously unreported street features for the entire nation during a series of decennial census operations. In some areas, local officials reviewed the census maps and identified new features and feature changes. The TIGER/Line files contain limited point and area landmark data. The enumerator updates for decennial censuses do not stress landmark features. Computer file matching and automated updates from the Economic and Agriculture censuses added landmarks and key geographic locations (KGLs).
Horizontal Positional Accuracy Report
The U.S. Census Bureau's mission to count and profile the Nation's people and institutions does not require very high levels of positional accuracy in its geographic products. Its files and maps are designed to show only the relative positions of elements. Coordinates in the TIGER/Line files are in decimal degrees and have six implied decimal places. The positional accuracy of these coordinates is not as great as the six decimal places suggest. The positional accuracy varies with the source materials used, but at best meets the established National Map Accuracy standards (approximately + /- 167 feet) where 1:100,000-scale maps from the USGS are the source. The U.S. Census Bureau cannot specify the accuracy of feature updates added by its field staff or of features derived from the GBF/DIME-Files or other map or digital sources. Thus, the level of positional accuracy in the TIGER/Line files is NOT suitable for high-precision measurement applications such as engineering problems, property transfers, or other uses that might require highly accurate measurements of the earth's surface. Despite the fact that TIGER/Line data positional accuracy is not as high as the coordinate values imply, the six-decimal place precision is useful when producing maps. This precision allows you to place features that are next to each other on the ground in the correct position, relative to each other, on the map without overlap.
Lineage
Source
Originator
U.S. Department of Commerce, Bureau of the Census, Geography Division
Publication Date
Unpublished Material
Title
Census TIGER database
Edition
UA Census 2000
Source Scale Denominator
100000
Type of Source Media
online
Source Temporal Extent
Time Period Information
Single Date/Time
Calendar Date
2000
Source Currentness Reference
Date the file was made available to create TIGER/Line File extracts.
Contribution
Selected geographic and cartographic information (line segments) from the Census TIGER database.
Spatial Data Organization Information
Direct Spatial Reference Method
Vector
Point and Vector Object Information
SDTS Terms Description
SDTS Point and Vector Object Type
String
Point and Vector Object Count
173999
Spatial Reference Information
Horizontal Coordinate System Definition
Geographic
Latitude Resolution
0.000000
Longitude Resolution
0.000000
Geographic Coordinate Units
Decimal degrees
Geodetic Model
Horizontal Datum Name
North American Datum of 1927
Ellipsoid Name
Clarke 1866
Semi-major Axis
6378206.400000
Denominator of Flattening Ratio
294.978698
Vertical Coordinate System Definition
Altitude System Definition
Altitude Resolution
1.000000
Altitude Encoding Method
Explicit elevation coordinate included with horizontal coordinates
Entity and Attribute Information
Entity Type
Entity Type Label
UA Census Hydrographic Features, 2000 - Alabama
Entity Type Definition
ESRI Shapefile. Lines represent hydrographic features
Entity Type Definition Source
ESRI; Department of Commerce, Census Bureau
Attributes
TLID
TIGER/Line ID, Permanent Record Identification Number
Definition Source
Department of Commerce, Census Bureau
FNODE
Internal node number for the beginning of an arc (From-node)
Definition Source
Department of Commerce, Census Bureau
TNODE
Internal node number for the end of an arc (To-node)
Definition Source
Department of Commerce, Census Bureau
LENGTH
Length of arc in coverage units
Definition Source
Computed
FEDIRP
Feature Direction, Prefix
Definition Source
Department of Commerce, Census Bureau
FENAME
Feature Name
Definition Source
Department of Commerce, Census Bureau
FETYPE
Feature Type
Definition Source
Department of Commerce, Census Bureau
FEDIRS
Feature Direction, Suffix
Definition Source
Department of Commerce, Census Bureau
CFCC
Census Feature Class Code. The CFCC identifies the most noticeable characteristic of a feature. (Census Feature Class CodesCensus 2000 TIGER/Line Files Technical Documentation, Department of Commerce, Census Bureau)
Definition Source
Department of Commerce, Census Bureau
Attribute Value Accuracy Explanation
First character describes feature class; Second character is a number describing the major category; Third character is a number describing the minor category.
FRADDL
Start Address, Left
Definition Source
Department of Commerce, Census Bureau
TOADDL
End Address, Left
Definition Source
Department of Commerce, Census Bureau
FRADDR
Start Address, Right
Definition Source
Department of Commerce, Census Bureau
TOADDR
End Address, Right
Definition Source
Department of Commerce, Census Bureau
ZIPL
ZIP Code, Left
Definition Source
Department of Commerce, Census Bureau
ZIPR
ZIP Code, Right
Definition Source
Department of Commerce, Census Bureau
CENSUS1
Census Internal Use Identifier
Definition Source
Department of Commerce, Census Bureau
CENSUS2
Census Internal Use Identifier
Definition Source
Department of Commerce, Census Bureau
CFCC1
Feature Class Identifier
H
Hydrographic Features
Definition Source
Department of Commerce, Census Bureau
Attribute Value Accuracy Explanation
First Digit of Census Feature Class Code (CFCC)
CFCC2
Feature Class + Major Category Descriptor
H0
Water feature, classification unknown or not elsewhere classified
H1
Naturally Flowing Water Features - Streams
H2
Man-Made Channel to Transport Water - canal, ditch, aqueduct
H3
Inland Body of Water: lake or pond
H4
Man-Made Body of Water: reservoir
H5
Seaward Body of Water: Bay, estuary, gulf, sound, sea, or ocean
H6
Body of Water in a Man-Made Excavation: flooded gravel pit
H7
Nonvisible Definition Between Water Bodies. The Census Bureau digitizes nonvisible definition boundaries to separate named water areas; for instance, an artificial boundary is drawn to separate a named river from the connecting bay
H8
Special Water Feature: Includes area covered by glaciers or snow fields
Definition Source
Census 2000 TIGER/Line Files Technical Documentation, Department of Commerce, Census Bureau
Attribute Value Accuracy Explanation
First 2 Digits of Census Feature Class Code (CFCC)
SOURCE
Alphanumeric character source code for complete chain and landmark features. Source codes identify the original (or final, if historical) operation that created the geographic object and its geometric properties.
[Blank]
Not Documented Elsewhere
A
Updated 1980 GBF/DIME-File
B
USGS 1:100,000-Scale DLG-3 File
C
Other USGS Map
J
Pre-1990 Census Updates
K
Post-1990 Census Updates (1990-1994)
L
Pre-Census 2000 Local Official Updates (1995-Census 2000)
M
Pre-Census 2000 field Operations (1995-Census 2000)
N
Pre-Census 2000 Office Update Operations (1995-Census 2000)
O
Post-Census 2000 (2000-2002)
Definition Source
Department of Commerce, Census Bureau
SHAPE
Feature geometry. (Coordinates defining the features.)
Definition Source
ESRI
SHAPE.LEN
Length of arc in coverage units
Definition Source
Computed
SHAPE.FID
Internal feature number. (Sequential unique whole numbers that are automatically generated.)
Definition Source
ESRI
Distribution Information
Format Name
Shape
Distributor
Harvard Geospatial Library
Name
Metadata Reference Information
Metadata Date
20030729
Metadata Contact
Contact Information
Contact Person Primary
Contact Person
Contact Organization
Harvard Geospatial Library
Contact Address
Address
Harvard University Library
Address
Office For Information Systems
Address
1280 Massachusetts Avenue
City
Cambridge
State or Province
MA.
Postal Code
02138
Country
USA
Contact Voice Telephone
617-495-2417
Contact Facsimile Telephone
617-496-0440
Contact Electronic Mail Address
hgl_ref@hulmail.harvard.edu
Metadata Standard Name
FGDC Content Standards for Digital Geospatial Metadata
Metadata Standard Version
FGDC-STD-001-1998
Metadata Extensions
Online Linkage
http://www.esri.com/metadata/esriprof80.html
Profile Name
ESRI Metadata Profile
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