Latitude, Longitude, Altitude

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Presentation transcript:

Latitude, Longitude, Altitude

Candidate Standard ISO 6709:1983. Standard representation of latitude, longitude and altitude for geographic point locations

ISO 6709 First edition published 1983 Second edition will be published in 2008 ISO/FDIS 6709 (2007-12-17) Second edition provides representation of horizontal coordinates other than latitude, longitude and includes heights and depths

Latitude Latitude on or north of the equator shall be designated by use of the plus sign (+), or (N). Latitude south of the equator shall be designated by use of the minus sign (-), or (S). The first two digits of the latitude string shall represent degrees. Subsequent digits shall represent minutes, seconds or decimal fractions: Degrees and decimal degrees: DD.DD Degrees, minutes and decimal minutes: DDMM.MMM Degrees, minutes, seconds and decimal seconds: DDMMSS.SS

Longitude Longitude on or east of the prime meridian shall be designated by use of the plus sign (+), or (E), Longitude west of the prime meridian shall be designated by use of the minus sign (-), or (W). The first three digits of the longitude string shall represent degrees. Subsequent digits shall represent minutes, seconds or decimal fractions: Degrees and decimal degrees: DDD.DD Degrees, minutes and decimal minutes: DDDMM.MMM Degrees, minutes, seconds and decimal seconds: DDDMMSS.SS

Height or Depth The representation of height or of depth is optional. If height or depth is expressed, a Coordinate Reference System (CRS) identifier shall be supplied. The referenced CRS shall describe whether the value is a height or a depth. Height and depth units shall be defined through the referenced CRS.

CRS identifier CRS identification shall be designated by the use of the characters “CRS” preceding crsName. The crsName shall be designated by the CRS unique identifier from a register (online, offline) Full CRS definition is in ISO 19111

Examples Representation of latitude and longitude without height or depth: Degrees +40-075CRSWGS_84/ +40-075/ Degrees and decimal degrees +40.20361-75.00417CRSWGS_84/ Degrees and minutes +4012-07500CRSWGS_84/ Degrees, minutes and decimal minutes +4012.22-07500.25CRSWGS_84/ Degrees, minutes and seconds +401213-0750015CRSWGS_84/ Degrees, minutes, seconds and decimal seconds +401213.1-0750015.1CRSWGS_84/

Examples Representation of latitude and longitude with height or depth: Degrees +40-075+350CRSWGS_84/ Degrees and decimal degrees +40.20361-75.00417+350.517CRSWGS_84/ Degrees and minutes +4012-07500-169.2CRSWGS_84/ Degrees, minutes and decimal minutes Degrees, minutes and seconds +401213-0750015+2.79CRSWGS_84/ Degrees, minutes, seconds and decimal seconds +401213.1-0750015.1+2.79CRSWGS_84/

Conclusions ISO 6709 is widely used in the geospatial and marine communities It is well documented with sound governance