The longitude zone numbers and latitude band letters for GZD over the United States are taken from the global scheme of MGRS.ġ00,000-meter Square Identification. Thus each area is given a unique alphanumeric Grid Zone Designator (GZD). geographic area is divided into 6-degree longitudinal zones designated by a number and 8-degree latitudinal bands designated by a letter. The numbering scheme used in the USNG is alphanumeric and follows these rules: USNG basic coordinate values and numbering are identical to UTM coordinate values over all areas of the United States. In Minnesota, USNG coordinates are identical to the Military Grid Reference System numbering scheme, the geo-coordinate standard used by NATO militaries for locating points on the earth.īasic Numbering. The following are main features and specifications of the USNG:Įquivalency with MGRS. This FGDC standard defines the specifications of the USNG and describes how the grid is to be presented on map products. National Grid standard developed by the Federal Geographic Data Committee (FGDC), documented as FGDC-STD-011-2001, and included in its entirety by reference in this standard. It is also intended to help people use location services such as GPS in conjunction with printed maps to find and communicate location information. The USNG is intended to improve interoperability across all national jurisdictions especially in crisis situations. The purpose of this state standard is to encourage the use of the USNG on all appropriate map products in the state and to specify how the USNG should be presented on maps when it is used. The USNG supplements other location referencing systems, such as street addresses or latitude / longitude. This standard does not apply to actual collection or storage of geospatial data. This standard applies when the USNG is represented on hard-copy maps, implemented in digital maps, or used for identifying and communicating locations. The USNG is of particular interest to the emergency management and response community. This standard pertains to all developers, distributors, and users of map products within the State of Minnesota including government agencies, private organizations, and the general public. This is not true with geographic coordinates. Therefore, distances can be accurately calculated between two locations easily, and the precision of locations and measurements can be maintained consistently across the state and across the nation. USNG location references correlate directly to field measurements. It has practical advantages over using geographic coordinates (latitude, longitude). The USNG is based on a common geographic projection and rectangular grid system (Universal Transverse Mercator). Widespread use of the USNG promises to provide a fast, unambiguous, repeatable way to communicate locations. Eliminating the need to translate has become particularly important during emergency response situations in which people need to communicate locations quickly, clearly and confidently. When different systems are used on different maps, however, it is difficult for people to translate between them. It is based on a universally defined geographic coordinate and grid system.Ī number of different coordinate and grid systems can be used on printed maps and computer map displays in order to describe locations. It can increase the usefulness and interoperability of printed maps and location-based services, such as global positioning systems (GPS). The USNG provides an efficient way to specify location information at different levels of detail anywhere in the United States. This standard describes a method for presenting the United States National Grid (USNG) in cartographic products. Date Issued : Approved by the Minnesota Governor's Council on Geographic Information
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