This data layer is a subset of the complete TIGER/Line data set. It was downloaded from the Census 2000 TIGER/Line Data mainted at the ESRI (www.esri.com) Geography Network (www.geographynetwork.com). It contains only the roads for the Barnstable County, Massachusetts area as required for the project GIS view area.
U.S. Department of Commerce, U.S. Census Bureau, Geography Divisi, 2001, tgr25001lka - TIGER/Line Files, Redistricting Census 2000 - Roads: TIGER/Line Files Each file contains a version code that uniquely identifies each specific release of a version of the TIGER/Line files. The version code (MMYY) represents the month and year that the data in the file was extracted from the TIGER database., U.S. Department of Commerce, Washington, DC.This is part of the following larger work.Online Links:
Hallett, Benjamin W. , Paskevich, Valerie, Poppe, Lawrence, Brand, Stephen G. , and Blackwood, Dann S. , 2003, A Pictorial Survey of the Bedrock Beneath Western Cape Cod, Massachusetts: Open-File Report 03-221, U.S. Geological Survey, Coastal and Marine Geology Program, Woods Hole Field Center, Woods Hole, MA.Online Links:
Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000. Longitudes are given to the nearest 0.000000. Latitude and longitude values are specified in Decimal degrees.
The horizontal datum used is North American Datum of 1983.
The ellipsoid used is Geodetic Reference System 80.
The semi-major axis of the ellipsoid used is 6378137.000000.
The flattening of the ellipsoid used is 1/298.257222.
Sequential unique whole numbers that are automatically generated.
Coordinates defining the features.
Line Features - 1) Roads 2) Railroads 3) Hydrography 4) Miscellaneous transportation features and selected power lines and pipe lines 5) Legal (governmental unit) and statistical boundaries
Landmark Features - 1) Point landmarks, e.g., schools and churches; sporatic coverage added on an as-needed basis 2) Area landmarks, e.g., Parks and cemeteries; sporatic coverage added on an as-needed basis
Polygon features - 1) Geographic entity codes for areas used to tabulate the Census 2000 census statistical data and governmental unit boundaries legally in effect as of the latest Boundary and Annexation Survey (BAS) 2) Locations of area landmarks The line features and polygon information form the majority of data in the TIGER/Line files. Some of the data/attributes describing the lines include coordinates, feature identifiers (names), CFCCs (used to identify the most noticeable characteristic of a feature), address ranges, and geographic entity codes. The Census Bureau includes landmark featureson an as-needed-basis and has made no attempt to ensure thatall instances of a particular landmark feature were included. The TIGER/Line files contain point and area labels that describe landmark features and provide locational reference. Area landmarks consist of a feature name or label and feature Landmarks may overlap or refer to the same set of polygons.The Census TIGER database uses collections of spatial objects (points, lines, and polygons) to model or describe real-world geography. The Census Bureau uses these spatial objects to represent features such as streets, rivers, and political boundaries and assigns attributes to these features to identify and describe specific features such as the 500 block of Market Street in Philadelphia, Pennsylvania.
U.S. Department of Commerce, U.S. Census Bureau
Geography Division
Upper Marlboro, MD 20772
USA
(301) 763-1128 (voice)
tiger@census.gov
In order for others to use the information in the Census TIGER database in a geographic information system (GIS) or for other geographic applications, the Census Bureau releases to the public extracts of the database in the form of TIGER/Line files. Various versions of the TIGER/Line files have been released on an irregular schedule since 1990; previous versions of the Census 2000 series include the Redistricting Census 2000 TIGER/Line files, the UA Census 2000 TIGER/Line files and the Census 2000 TIGER/Line files.
U.S. Department of Commerce, U.S. Census Bureau, Geography Divisi, Unpublished material, Census TIGER database.
Data sources used in this process:
Accurate against Federal information Processing Standards (FIPS), FIPS Publication 6-4, and FIPS-55 at the 100% level for the codes and base names. The remaining attribute information has been examined but has not been fully tested for accuracy.
The information present in these files is provided for the purposes of statistical analysis and census operations only. Coordinates in the TIGER/Line files have six implied decimal places, but 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 generally the information is no better than the established national map Accuracy standards for 1:100,000-scale maps from the U.S. Geological Survey (USGS); thus it 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. The USGS 1:100,000-scale maps met national map accuracy standards and use coordinates defined by the North American Datum, 1983. For the contiguous 48 States, the cartographic fidelity of most of the TIGER/Line files, in areas outside the 1980 census Geographic Base File/Dual Independent map Encoding (GBF/DIME) file coverage and selected other large metropolitan areas, compare favorably with the USGS 1:100,000-scale maps. The Census Bureau cannot specify the accuracy of features inside of what was the 1980 GBF/DIME-File coverage or selected metropolitan areas. The Census Bureau added updates to the TIGER/Line files that enumerators annotated on maps sheets prepared from the Census TIGER database as they attempted to traverse every street feature shown on the Census 2000 map sheets; the Census Bureau also made other corrections from updated map sheets supplied by local participants for Census Bureau programs. The locational accuracy of these updates is of unknown quality. In addition to the Federal, State, and local sources, portions of the files may contain information obtained in part from maps and other materials prepared by private companies. Despite the fact the TIGER/Line data positional accuracy is not as high as the coordinate values imply, the six-decimal place precision is useful when producing maps. The precision allows features that are next to each other on the ground to be placed in the correct position, on the map, relative to each other, without overlap.
Data completeness of the TIGER/Line files reflects the contents of the Census TIGER database at the time the TIGER/Line files (2000 version) were created.
The feature network of lines (as represented by Record Types 1 and 2) is complete for census purposes. Spatial objects in TIGER/Line belong to the "Geometry and Topology" (GT) class of objects in the "Spatial Data Transfer Standard" (SDTS) FIPS Publication 173 and are topologically valid. Node/geometry and topology (GT)-polygon/chain relationships are collected or generated to satisfy topological edit requirements. These requirements include:
* 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 GT-polygons are defined for each complete chain element and are consistent throughout the extract process. * The chains representing the limits of the files are free of gaps.
The Census Bureau performed automated tests to ensure logical consistency and limits of files. 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 TIGER database. Standard geographic codes, such as FIPS codes for states, counties, municipalities, and places, 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 TIGER database files. Most of the Codes themselves 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.
Are there legal restrictions on access or use of the data?
- Access_Constraints:
- Public domain data from the U.S. government are freely redistributable with proper metadata and source attribution.
- Use_Constraints:
- Acknowledgment of the U.S. Census Bureau would be appreciated for products derived from these files. TIGER, TIGER/Line, and Census TIGER are registered trademarks of the U.S. Census Bureau. ZCTA is a trademark of the U.S. Census Bureau.
U.S. Department of Commerce
8903 Presidential Parkway, Room 520 WP I
Upper Marlboro, MD 20772
USA
(301) 763-1128 (voice)
(301) 763-4710 (FAX)
tiger@census.gov
Redistricting Census 2000 TIGER/Line Files
No warranty, expressed or implied is made and no liability is assumed by the U.S. Government in general or the U.S. Census Bureau in specific as to the positional or attribute accuracy of the data. The act of distribution shall not constitute any such warranty and no responsibility is assumed by the U.S. Government in the use of these files.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.
| Data format: | TGRLN (compressed) (version Redistricting Census 2000) Size: 9.975 |
|---|---|
| Network links: |
www.census.gov/geo/www/tiger |
The online copy of the TIGER/Line files may be accessed without charge. See <http://www.census.gov/geo/www/tiger> for information on availability on CD-ROM/DVD and associated costs for these products.
To obtain more information about ordering TIGER/Line files visit <http://www.census.gov/geo/www/tiger>.
The 2000 TIGER/Line files contain geographic data only and do not include display or mapping software or statistical data. For information on how to use the TIGER/Line data with a specific software package users should contact the company that produced the software. A list of some vendors who have developed software capable of processing TIGER/Line files can be found by visiting <http://www.census.gov/geo/www/tiger>. The TIGER/Line files are provided in ASCII text format only. Users are responsible for converting or translating the files into a format used by their specific software package.
U.S. Department of Commerce, U.S. Census Bureau, Geography Division, Geographic Products Management Branch
8903 Presidential Parkway, Room 520 WP I
Upper Marlboro, MD 20772
USA
(301) 763-1128 (voice)
tiger@census.gov