Latitude, Longitude, Altitude

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Latitude, Longitude, Altitude
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Candidate Standard

• ISO 67091983. Standard representation of
  latitude, longitude and altitude for geographic
  point locations

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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

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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

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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

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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.

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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

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Examples

• Representation of latitude and longitude without
  height or depth

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Examples

• Representation of latitude and longitude with
  height or depth

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Conclusions

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