<xsd:simpleType name="LocationUSNG_type">
<xsd:annotation>
<xsd:documentation xml:lang="en">
The USNG or US National Grid is an alphanumeric
reference system that overlays the Universal Transverse
Mercator (UTM) numerical coordinate system. A USNG
coordinate consists of three parts, the: 1. Grid Zone
Designation (GZD) for worldwide unique geoaddresses (two
digits plus one letter, developed from the UTM system).
2. 100,000-meter Square Identification for regional
areas (two letters). 3. Grid Coordinates for local areas
(always an even number of digits between 2 and 10
depending upon precision necesary to uniquely identify
the location). Look to
www.fgdc.gov/standards/status/usng.html for a normative
definition.
</xsd:documentation>
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<xsd:restriction base="xsd:string">
<xsd:pattern value=".*" />
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