acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION• The eighth information item is elevation / ELE. It is expressed in meters. It is anumeric value. It is between -422 meters (Dead Sea) and 8848 meters (MountEverest). Allowed special characters are the negative sign and the period.• The ninth information item is the geodetic datum code / GDC 22 . It is analphanumeric value of 3 to 6 characters in length. This information item is used toindicate which coordinate system was used to represent the values in informationitems 2 through 7. If no entry is made in this information item, then the basis for thevalues entered in the first eight information items shall be WGS84, the code for theWorld Geodetic Survey 1984 version - WGS 84 (G873). See Table 6 for values.The tenth, eleventh and twelfth information items are treated as a group and are optional.These three information items together are a coordinate which represents a location with aUniversal Transverse Mercator (UTM) coordinate. If any of these three information items ispresent, all shall be present.• The tenth information item is the geographic coordinate universal transverseMercator zone / GCM 23 . It is an alphanumeric value of 2 to 3 characters. This is aone or two digit UTM zone number followed by the 8 degree latitudinal banddesignator (which is a single letter). Valid latitudinal band designators include Cthrough X, omitting I and O.• The eleventh information item is the geographic coordinate universal transverseMercator easting / GCE. It is an integer of 1 to 6 digits.• The twelfth information item is the geographic coordinate universal transverseMercator northing / GCN. It is an integer of 1 to 8 digits.The following item is used for instances when GPS or other coordinate systems may not bereadily available:• The thirteenth information item is optional. It is the geographic reference text /GRT. This information item is an alphanumeric entry of up to 150 characters. It is afree form text describing a street address or other physical location (such as ‘Cornerof Washington and Madison, Geneva, NY’).The following two information items should be used when an alternate system had beenutilized for recording position:• A fourteenth optional information item geographic coordinate other systemidentifier / OSI allows for other coordinate systems. This information itemspecifies the system identifier. It is up to 10 characters in length. Examples are:22See the Glossary maintained by the National Oceanic and Atmospheric Administration for information oncommonly used terms. http://www.ngs.noaa.gov/CORS-Proxy/Glossary/xml/NGS_Glossary.xml23The UTM zone numbers and designators are described athttp://earth-info.nga.mil/GandG/coordsys/grids/utm.html60