Metadata for Montana Roads from TIGER/Line Files, 2000 Metadata for Montana Roads from TIGER/Line Files, 2000

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Identification Information:

Citation:

Originator:: U.S. Census Bureau
Geography Division
Publication date: 2001
Title: Montana Roads from TIGER/Line Files, 2000
Edition: Redistricting Census 2000
Other citation details:: The former name of the data set on the NRIS web site was "road2000"
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Shapefiles/RoadsCensus2000.zip

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Thumbnails/20030405_608_thumb.jpg
Browse graphic file description: Thumbnail image of Montana's road map

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20030405_608_2000_RoadsTiger.gif
Browse graphic file description: Map showing all of Montana's roads

Abstract:

These are all of the roads from the U.S. Census Bureau 2000 TIGER files. Most of the roads were digitized from 1:100,000 scale maps by the US Geological Survey. Roads added to the database after 1990 were digitized by the Census Bureau from various sources.

Some roads that exactly follow county lines exist twice in the TIGER database -- once for each county that they appear in. One of each of these pairs has been removed from the version of this data set that is on the SDE server at the State Library and the statewide shapefile on the web site. The individual county shapefiles on the web site are also missing these duplicate roads, so most county shapefiles will not have all of the roads that fall exactly on their boundaries.

Supplemental information:

To find out more about TIGER/Line files and other Census TIGER database derived data sets visit http://www.census.gov/geo/www/tiger.

The Census Bureau removed many roads from the 1992 TIGER files that do not appear in this data set. Roads were removed if the Census Bureau believes that they do not actually exist on the ground, or if there are no housing units along the road and the road was not needed as a point of reference for field operations of the Census.

Time period of content:

Calendar date: 2000
Currentness reference: ground condition

Status:

Progress: Complete
Maintenance and update frequency:: This is the only statewide roads data that will be created from the 2000 TIGER files. The Census Bureau plans a major improvement to TIGER data for TIGER 2004.

Access constraints: None

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.

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time.

Point of contact:

Montana State Library
P.O. Box 201800
Helena, Montana 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Data Quality Information:

Completeness report:

Data completeness of the TIGER/Line files reflects the contents of the Census TIGER database at the time the TIGER/Line files (Redistricting Census 2000 version) were created.

Horizontal Positional Accuracy Report:

Most data in TIGER files was digitized from USGS 1:100,000-scale maps, which have a horizontal accuracy of approximately 50 meters, or 155 feet. The following paragraph is the Census Bureau's detailed accuracy statement for TIGER files.

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 Redistricting Census 2000 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.

Lineage:

Source information:

Originator:: U.S. Department of Commerce
Bureau of the Census
Geography Division
Publication date: 2000
Title: TIGER/Line Files
Edition: Redistricting Census 2000
Online linkage: http://www.census.gov/geo/www/tiger/
Online linkage: http://www.census.gov/geo/www/tiger/rd_2ktiger/tgr2kweb.html
Source scale denominator: 100000
Source contribution: The data set is a sub-set of this source.
Calendar date: 2000

Process step:

The Montana Census and Economic Information Center (CEIC) converted the native TIGER/Line files into a number of separate ArcView shapefiles for each Montana county. CEIC used the TGR2SHP version 4.0 (GIS Tools, Knoxville, TN) to convert the files. As the software did not yet contain a TIGER 2000 conversion option, the TIGER 99 option was used.


Process date: 2001

Process step:

The Montana State Library, Natural Resource Information System, converted all the shapefiles to Arc/Info coverage format, projected them to Montana State Plane Coordinates with Arc/Info, selected the roads from the data, and joined the data from the separate counties into a single data set.


Process date: 2003

Process step:

The data was processed to identify duplicate roads, where roads that fall on county lines were brought in from both counties. One of each of these duplicates was removed


Process date: 04/05/2003

Spatial Data Organization Information:

Indirect spatial reference method:

Federal Information Processing Standards (FIPS) and feature names and addresses.

Point and vector object information:

SDTS object type: String

SDTS object count: 431784

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System 1983

SPCS zone identifier: 2500

Lambert conformal conic:

Standard parallel: 45.000000
Standard parallel: 49.000000
Longitude of central meridian: -109.500000
Latitude of projection origin: 44.250000
False easting: 600000.000000
False northing: 0.000000

Planar distance units: meters

Geodetic model:

Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137.000000
Denominator of flattening ratio: 298.257222

Entity and Attribute Information:

Entity type label: RoadsCensus2000.dbf

Entity type definition: Line feature attribute table

Attribute label: FID

Attribute definition: Shapefile sequence number

Attribute label: Shape

Attribute definition: Feature geometry

Attribute label: ObjectID

Attribute definition:: Sequence number from enterprise database version of the layer

Attribute label: FNODE

Attribute definition: Node sequence number for the beginning of an arc (from-node)

Attribute label: TNODE

Attribute definition: Node sequence number for the end of an arc (to-node)

Attribute label: LENGTH

Attribute definition: Length of feature in meters

Attribute label: ROAD_ID

Attribute definition: ID number from original coverage version of the data

Attribute label: TLID

Attribute definition: Nationally-unique Tiger/Line complete chain identity number
Range domain minimum: 146880341
Range domain maximum: 206910328

Attribute label: FEDIRP

Attribute definition: Feature Direction prefix (part of the street address)
Attribute domain: Usually a directional indicator such as N, S, E, W, NE, etc

Attribute label: FENAME

Attribute definition: Feature Name (part of the street address)
Attribute domain:: Free character field giving a common name of the feature represented by the complete chain. For street names, this field must ususally be combined with FEDIRP, FETYPE, and/or FEDIRS to form the complete name of the street.

Attribute label: FETYPE

Attribute definition:: Feature Type (part of the street address). This will be an abbreviation for the road type, such as St, Ave, Blvd, etc.
Codeset name: Census_Abbrevs.html

Attribute label: FEDIRS

Attribute definition: Feature Direction suffix (part of the street address)
Attribute domain: Usually a directional indicator such as N, S, E, W, NE, etc

Attribute label: CFCC

Attribute definition:: Census Feature Class Code
This is the primary field that identifies what kind of feature the complete chain represents.
Codeset name: Census_CFCC.html

Attribute label: ROADCLASS