Date Issued: Approved by the Minnesota Governor's Council on Geographic Information June 9, 1998
Who cares about these standards?
All developers, distributors, and users of existing or planned spatial databases that originate or are maintained within State of Minnesota government agencies. Spatial databases are those that include explicit references to the geographic location of the features they describe.
When do they apply? When do they not apply?
This standard has been developed to facilitate exchange of data between Minnesota government agencies. Use of this standard is mandatory when the following two conditions exist:
- a state agency is transferring data to another state agency, AND
- no commonly agreed to internal coordinate encoding exchange standard exists between the two agencies.
Use of this standard is recommended when Minnesota state government agencies are publishing data for use by external stakeholders (including other units of government operating at other levels). This standard applies to data that are being transferred, and does not restrict the manner in which data are stored internally, although the capability to translate data into a form consistent with this standard should exist within all affected agencies.
Purpose of these Standards:
The purpose of this standard is to define a common framework for spatial data exchange. This benefits all consumers of state-produced data by eliminating the need to prepare customized procedures for processing coordinate information. Deploying the standard allows for the streamlining of exchange procedures between data producers and consumers, thereby reducing costs associated with data processing and handling.
This standard defines expression of coordinate values as follows:
Projection: Universal Transverse Mercator (an instance of the Transverse Mercator Projection as defined by Snyder, 1987).
UTM Zone: 15 (extended to cover the entire land surface of the State of Minnesota)
Datum: North American Datum of 1983 (NAD83)
Recognizing that some coordinate processing software products may not directly support UTM as an independent projection, the following manual projection parameters for the standard are provided:
Projection name: Transverse Mercator
Scale factor at central meridian: 0.9996
Longitude of central meridian: 93 00 00 degrees
Latitude of origin: 00 00 00 degrees
False easting (meters): 500,000
False northing (meters): 0
Datum: North American Datum of 1983 (NAD83)
What constitutes compliance?
Minnesota state agencies must be capable of translating coordinate information into a form consistent with the standard. Agencies may administer or apply data in alternative forms. Agencies may also distribute or publish data in alternative forms as long as they are made available in the standard form as an option.
How will compliance be measured?
Evidence of compliance will be determined based on reports of satisfactory data transfers between state agencies, and the development of distribution strategies that incorporate the standard.
The coordinate specification provided in this standard does not stipulate a preferred adjustment to the geodetic network (for example, it does not reference the 1996 High Accuracy Reference Network (HARN) adjustment). While the most current adjustment provides the greatest accuracy, it is not always practical or necessary to update data collected on a prior adjustment.
It should be noted, however, that data on different adjustments should not be mixed within the same dataset. It is also important to remember that, since in some applications the difference between adjustments can be significant, the adjustment used to encode coordinates within any given transfer data set must be noted in the accompanying metadata.
References and Sources of More Information:
National Imagery and Mapping Agency, Technical Manual 8358.1 Datums, Ellipsoids, Grids, and Grid Reference Systems, 1990.
Snyder, J. P. Map Projections--A Working Manual. U. S. Geological Survey Professional Paper 1395. Washington, DC: U. S. Government Printing Office, pp. 38-75, 1987.
The Universal Transverse Mercator (UTM) Grid USGS Fact Sheet 077-01 (August 2001) https://pubs.er.usgs.gov/publication/fs07701.
Further information about this standard may be obtained from the Minnesota Geospatial Information Office (MnGeo); 300 Centennial Building; 658 Cedar Street; St. Paul, MN 55155; phone: 651.201.2499; e-mail: email@example.com.