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<br />serves as ANSI's U.S. Technical Advisory Group to the International Organization for <br />Standardization (ISO) on matters concerning digital geographic information. <br /> <br />United States National Grid (http://www.fgdc.gov/standards/status/usng.html) <br />The objective of this U.S. National Grid standard is to create a more interoperable environment <br />for developing location-based services within the United States and to increase the <br />interoperability of location services appliances with printed map products by establishing a <br />nationally consistent grid reference system as the preferred grid for NSDI applications. The U.S. <br />National Grid is based on universally defined coordinate and grid systems and can, therefore, be <br />easily extended for use world-wide as a universal grid reference system. <br /> <br />There are a number of coordinate reference systems that can be used either in location service <br />appliances or on printed maps for the purpose of establishing a location. Within automated <br />location service appliances, the conversion of coordinates based on one well-defined reference <br />system to coordinates based on another can be both automatic and transparent to the user. These <br />devices can support multiple coordinate reference systems with little difficulty. However, it is <br />not easy for humans to work in multiple reference systems and humans cannot convert between <br />systems without the aid of location service appliances, calculators, or conversion tables (FGDC- <br />STD-OII-2001). <br /> <br />H-7 <br /> <br />