Title: United States National Grid - Wikipedia
Headings: United States National Grid
United States National Grid
Contents
Overview
Description: How the USNG works
History
Advantages over latitude/longitude
Limitations and tradeoffs
Adoption and current applications
Standards
Gridded maps
Software applications
Search and rescue (SAR)
Emergency Location Marker (ELM)
First responders
Emergency Management
Asset Identification and Mapping
Recreation and other uses
Future direction and initiatives
See also
References
Further reading
External links

Content: QZSS) (Japan)
Discrete Global Grid and Geocoding
Standards (history)
NGVD 29
Sea Level Datum 1929
OSGB36
Ordnance Survey Great Britain 1936
SK-42
Systema Koordinat 1942 goda
ED50
European Datum 1950
SAD69
South American Datum 1969
GRS 80
Geodetic Reference System 1980
ISO 6709
Geographic point coord. 1983
NAD 83
North American Datum 1983
WGS 84
World Geodetic System 1984
NAVD 88
N. American Vertical Datum 1988
ETRS89
European Terrestrial Ref. Sys. 1989
GCJ-02
Chinese obfuscated datum 2002
Geo URI
Internet link to a point 2010
International Terrestrial Reference System
Spatial Reference System Identifier (SRID)
Universal Transverse Mercator (UTM)
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The United States National Grid (USNG) is a multi-purpose location system of grid references used in the United States. It provides a nationally consistent "language of location", optimized for local applications, in a compact, user friendly format. It is similar in design to the national grid reference systems used in other countries. The USNG was adopted as a national standard by the Federal Geographic Data Committee (FGDC) of the US Government in 2001. Contents
1 Overview
2 Description: How the USNG works
3 History
4 Advantages over latitude/longitude
5 Limitations and tradeoffs
6 Adoption and current applications
6.1 Standards
6.2 Gridded maps
6.3 Software applications
6.4 Search and rescue (SAR)
6.5 Emergency Location Marker (ELM)
6.6 First responders
6.7 Emergency Management
6.8 Asset Identification and Mapping
6.9 Recreation and other uses
7 Future direction and initiatives
8 See also
9 References
10 Further reading
11 External links
Overview
While latitude and longitude are well suited to describing locations over large areas of the Earth's surface, most practical land navigation situations occur within much smaller, local areas. As such, they are often better served by a local Cartesian coordinate system, in which the coordinates represent actual distance units on the ground, using the same units of measurement from two perpendicular coordinate axes.