Metadata for U.S. National Grid, Montana Area Metadata for U.S. National Grid, Montana Area

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Identification Information:

Citation:

Originator: Montana State Library
Publication date: 04/15/2006
Title: U.S. National Grid, Montana Area
Other citation details:: The former name of the data set on the NRIS web site was "usng"
Online linkage: https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Geodatabases/USNationalGrid.zip

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Thumbnails/20060415_444_thumb.jpg
Browse graphic file description: Thumbnail image of Montana Grid Zones and Grid Squares of the U.S. National Grid

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20060415_444_usng1b.gif
Browse graphic file description: Montana Grid Zones and Grid Squares of the U.S. National Grid

Browse graphic file name: http://docs.msl.mt.gov/geoinfo/Images/Metadata/usng2.gif
Browse graphic file description: Topographic map showing U.S. National Grid zones and 1000 meter coordinate squares

Abstract:

This geodatabase contains features of the U.S. National Grid (USNG) for the area around Montana. The USNG_Polygons and USNG_Borders feature classes contain the USNG Grid Zones and 100,000-meter named grid squares and their borders. The USNG_Lines feature class contains 1000-meter grid lines. In addition to these three substantive feature classes, the geodatabase contains two ArcMap mxd documents that illustrate the use of layers. One document is a statewide map showing the grid zones and the names of the grid squares. The other document shows a small area at the intersection of four grid zones and the two-digit easting and northing values of the 1000-meter grid lines. The geodatabase contains a Montana county line layer and an image of a USGS 1:100,000 scale map to support the mxd documents.

Purpose:

For display of the U.S. National Grid on maps whose area covers more than one USNG Grid Zone. At the time of the creation of this data, there were no automated programs that could do this. The layer is also used by the State Library's on-line Topofinder application to determine USNG grid square IDs for its display of USNG coordinates.

Time period of content:

Calendar date: 04/15/2006
Currentness reference: publication date

Status:

Progress: Complete

Access constraints: None

Use constraints:

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:

Lineage:

Process step:: Rectangular grids of lines were automatically generated as Arc/Info coverages in UTM coordinates, and the x-coordinate, y-coordinate, and line type values were assigned to the lines. The lines were densified to a 1-kilometer interval so that the line intersections would convert to the correct locations when the data were projected to State Plane coordinates.

The grids were clipped with lines defining the UTM zone boundaries, and the lines in each grid outside its zone were removed. The grids were combined into a single coverage and projected to State Plane Coordinates.

The lines from the combined coverage that define the USNG grid squares were selected from the grid coverage and saved in a separate coverage.
All of these steps were performed by an Arc Macro Language program called makegrids.aml, which is included in the geodatabase distribution zip file.
Process step:: The USNG coverage data were converted to geodatabase format and the final feature attributes were assigned.

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: G-polygon

SDTS object count: 112

SDTS object type: String

SDTS object count: 1902

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System

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: USNG_Polygons

Attribute label: OBJECTID

Attribute definition: Database sequence number

Attribute label: Shape

Attribute definition: Feature geometry

Attribute label: Grid_Zone

Attribute definition: U.S. National Grid Zone Designation
Attribute domain:: The first two characters are the UTM zone number. The third character is a letter designation for a 8-degree high zone counted north from the equator.

Attribute label: Grid_Square

Attribute definition: U.S. National Grid 100,000-meter square, two-character ID

Attribute label: Shape_Length

Attribute definition: Length of the polygon perimeter in meters

Attribute label: Shape_Area

Attribute definition: Area of the polygon in square meters

Entity type label: USNG_Lines

Attribute label: OBJECTID

Attribute definition: Database sequence number

Attribute label: Shape

Attribute definition: Feature geometry

Attribute label: Easting

Attribute definition: Two-character USNG Easting value
Attribute domain:: This field is filled out for vertical grid lines. This field is blank for horizontal lines and grid zone boundary lines.

Attribute label: Northing

Attribute definition: Two-character USNG Northing value
Attribute domain:: This field is filled out for horizontal grid lines. This field is blank for vertical lines and grid zone boundary lines.

Attribute label: X_COORD

Attribute definition:: UTM x coordinate of vertical grid lines, or longitude of grid zone boundaries.
Attribute domain:: This field is filled out for vertical grid lines. This field is blank for horizontal lines and grid zone boundary lines.

Attribute label: Y_COORD

Attribute definition:: UTM y coordinate of horizontal grid lines, or longitude of grid zone boundaries.
Attribute domain:: This field is filled out for horizontal grid lines. This field is blank for vertical lines and grid zone boundary lines.

Attribute label: Type

Attribute definition: Type of line

Attribute label: Shape_Length

Attribute definition: Length of feature in meters

Entity type label: USNG_Borders

Attribute label: OBJECTID

Attribute definition: Database sequence number

Attribute label: Shape

Attribute definition: Feature geometry

Attribute label: X_COORD

Attribute definition:: UTM x coordinate of vertical grid lines, or longitude of grid zone boundaries.
Attribute domain:: This field is filled out for vertical grid lines. This field is blank for horizontal lines and grid zone boundary lines.

Attribute label: Y_COORD

Attribute definition:: UTM y coordinate of horizontal grid lines, or longitude of grid zone boundaries.
Attribute domain:: This field is filled out for horizontal grid lines. This field is blank for vertical lines and grid zone boundary lines.

Attribute label: Type

Attribute definition: Type of line

Attribute label: Shape_Length

Attribute definition: Length of feature in meters

Distribution Information:

Distributor:

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

Resource description: Downloadable Data

Distribution liability:

Standard order process:

Digital form:

Metadata Reference Information:

Metadata date: 02/03/2014

Metadata review date: 04/17/2013

Metadata review date: 04/15/2006

Metadata 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