U.S. National Grid, Montana Area

Montana State Library 20060415 U.S. National Grid, Montana Area Helena, Montana Montana State Library The former name of the data set on the NRIS web site was "usng" https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Geodatabases/USNationalGrid.zip 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. 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. 20060415 publication date Complete -117.1 -102.2 49.7 43.3 ISO 19115 Topic Category location US National Grid U.S. National Grid United States National Grid USNG Montana None 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. Montana State Library Montana Administrative Boundaries Framework Coordinator mailing and physical

P.O. Box 201800

1201 11th Ave

Helena Montana 59620 US (406) 444-5354 Montana Relay 711 (406) 444-0266 geoinfo@mt.gov 8-5 For GIS assistance please submit a GIS Support Ticket: https://msl.mt.gov/geoinfo/Help/ https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Thumbnails/20060415_444_thumb.jpg Thumbnail image of Montana Grid Zones and Grid Squares of the U.S. National Grid https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/20060415_444_usng1b.gif Montana Grid Zones and Grid Squares of the U.S. National Grid http://docs.msl.mt.gov/geoinfo/Images/Metadata/usng2.gif Topographic map showing U.S. National Grid zones and 1000 meter coordinate squares 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. 20060414 The USNG coverage data were converted to geodatabase format and the final feature attributes were assigned. 20060415 Vector G-polygon 112 String 1902 State Plane Coordinate System 2500 45.000000 49.000000 -109.500000 44.250000 600000.000000 0.000000 meters North American Datum of 1983 Geodetic Reference System 80 6378137.000000 298.257222 USNG_Polygons OBJECTID Database sequence number Shape Feature geometry Grid_Zone U.S. National Grid Zone Designation 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. Grid_Square U.S. National Grid 100,000-meter square, two-character ID Shape_Length Length of the polygon perimeter in meters Shape_Area Area of the polygon in square meters USNG_Lines OBJECTID Database sequence number Shape Feature geometry Easting Two-character USNG Easting value This field is filled out for vertical grid lines. This field is blank for horizontal lines and grid zone boundary lines. Northing Two-character USNG Northing value This field is filled out for horizontal grid lines. This field is blank for vertical lines and grid zone boundary lines. X_COORD UTM x coordinate of vertical grid lines, or longitude of grid zone boundaries. This field is filled out for vertical grid lines. This field is blank for horizontal lines and grid zone boundary lines. Y_COORD UTM y coordinate of horizontal grid lines, or longitude of grid zone boundaries. This field is filled out for horizontal grid lines. This field is blank for vertical lines and grid zone boundary lines. Type Type of line 0 Normal grid line 1 Boundary of a 100,000 meter USNG square 2 Boundary of a USNG Grid Zone Shape_Length Length of feature in meters USNG_Borders OBJECTID Database sequence number Shape Feature geometry X_COORD UTM x coordinate of vertical grid lines, or longitude of grid zone boundaries. This field is filled out for vertical grid lines. This field is blank for horizontal lines and grid zone boundary lines. Y_COORD UTM y coordinate of horizontal grid lines, or longitude of grid zone boundaries. This field is filled out for horizontal grid lines. This field is blank for vertical lines and grid zone boundary lines. Type Type of line 1 Boundary of a 100,000 meter USNG square 2 Boundary of a USNG Grid Zone Shape_Length Length of feature in meters Montana State Library Montana Administrative Boundaries Framework Coordinator mailing and physical

P.O. Box 201800

1201 11th Ave

Helena Montana 59620 US (406) 444-5354 Montana Relay 711 (406) 444-0266 geoinfo@mt.gov 8-5 For GIS assistance please submit a GIS Support Ticket: https://msl.mt.gov/geoinfo/Help/ Downloadable Data 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. ESRI Geodatabase https://ftpgeoinfo.msl.mt.gov/Data/Spatial/NonMSDI/Geodatabases/USNationalGrid.zip 20140203 20130417 20060415 Montana State Library Montana Administrative Boundaries Framework Coordinator mailing and physical

P.O. Box 201800

1201 11th Ave