Metadata for Montana Public Land Survey Lines from 1:100,000 scale BLM maps. Metadata for Montana Public Land Survey Lines from 1:100,000 scale BLM maps.

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Identification Information:

Citation:

Originator: Montana State Library
Publication date: 03/24/1996
Title:: Montana Public Land Survey Lines from 1:100,000 scale BLM maps.
Other citation details:: The former name of the data set on the NRIS web site was "ab106"
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Shapefiles/plss100k.zip

Abstract:

Townships, Ranges, and Sections in Montana, including section lines "protracted" through unsurveyed areas by the BLM or Forest Service.

Purpose:

For display of Public Land Survey and for location of features whose legal descriptions are known. More accurate section location data, along with quarter-quarter section data and government lot data, is available in the Geographic Coordinate Database (GCDB). The GCDB, however, does not include data for every section in Montana.

Time period of content:

Beginning date: 1975
Ending date: 1993
Currentness reference: Publication Date

Status:

Progress: Complete

Access constraints: None

Use constraints:

Not for use at scales greater than 1:100000. Not for accurate determination of section corner or property line locations.

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
PO 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:

Attribute accuracy report:

Township and Range numbers were checked and corrected at the State Library until they were accurate. No errors in section numbers were found when they were spot-checked at the Library, but not every section was checked.

Horizontal Positional Accuracy Report:

Approximate horizontal accuracy is 51 meters, assuming source data meets National Map Accuracy Standards.

Lineage:

Source information:

Originator:: National Mapping Division
U.S. Geological Survey
Publication date: 1975
Title: 1:100,000-scale Quadrangle Public Land Survey mylars
Source scale denominator: 100000
Type of source media: mylar
Source contribution: All of the coordinates were collected from these maps.
Beginning date: 1975
Ending date: 1993

Source information:

Originator:: U.S. Bureau of Land Management
Montana Office
Publication date: Unpublished material
Title: Public Land Survey Arc/Info coverages
Other citation details: 222 North 32nd Street, Billings, MT 59109 406-255-2953
Source scale denominator: 100000
Type of source media: Arc/Info E00 files on 8mm tape
Source contribution: The data is an edited copy of this source.
Calendar date: 03/21/1996

Process step:

Digitize the lines from the USGS mylar maps and code the arcs and polygons. This was performed by the BLM office in Billings using ADS software on their PRIME minicomputer.


Process date: 06/01/1994

Process step:

Correct the projection definition of all BLM data and convert any single-precision coverages to double precision. Project coverages from UTM zone 12 coordinates to Albers.


Process date: 03/21/1996

Process step:

Parse the LABEL item in the BLM PCODE file into separate Town, Range, and Section items in the PAT.


Process date: 03/21/1996

Process step:

Add polygon attributes to BLM coverages that had no polygon attributes or no PCODE files.


Process date: 03/21/1996

Process step:

View township, range, and section attributes of every coverage and correct errors.


Process date: 03/21/1996

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: G-polygon

SDTS object count: 159335

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
Standard parallel: 49
Longitude of central meridian: -109.5
Latitude of projection origin: 44.25
False easting: 600000.00000
False northing: 0.00000

Planar distance units: meters

Geodetic model:

Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137.0
Denominator of flattening ratio: 298.257

Entity and Attribute Information:

Entity type label: PLSS.AAT

Entity type definition: Arc Attribute Table

Attribute label: TYPE

Attribute definition: Code for Land Survey Line Type

Entity type label: PLSS.PAT

Entity type definition: Polygon Attribute Table

Attribute label: TOWN

Attribute definition: Township Number
Range domain minimum: 1
Range domain maximum: 38

Attribute label: N/S

Attribute definition: Township North or South Designation

Attribute label: RANGE

Attribute definition: Range Number
Range domain minimum: 1
Range domain maximum: 65

Attribute label: E/W

Attribute definition: Range East or West Designation

Attribute label: SECTION

Attribute definition: Section Number
Range domain minimum: 1
Range domain maximum: 36

Attribute label: TRS

Attribute definition:: Combined Township, Range, Section
This is a redefined item to create a unique ID for each section. Examples: "37.0N 31.0W 3" is Township 37 North, Range 31 West, section 3. "27.0N 21.5W23" is Township 27 North, Range 21 1/2 West, Section 23.

Distribution Information:

Distributor: