Definition
The geographic longitude of an address point on the earth, measured in decimal degrees east or west of the Greenwich Meridian.
Components
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Data Element ConceptAddress: Geocode Longitude
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Object ClassAddress
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PropertyGeocode Longitude
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Value DomainLongitude Decimal Degrees XNNN.N(9)
Representation
This representation is based on the value domain for this data element, more information is available at " Longitude Decimal Degrees XNNN.N(9) ".| Data Type | LONGITUDE |
|---|---|
| Unit Of Measure | Decimal Degree |
| Format | XNNN.N(9) |
| Maximum character length | 13 |
Comments
Geographical coordinates (latitudes and longitudes) are the universal system for defining spatial position. A set of geographic coordinates on a datum is complete and unique, worldwide.
Positions of geographic features can be defined in space by a set of coordinates. In order for coordinates to be unique, the coordinate reference system needs to be fully defined.
A coordinate reference system is realised by a reference frame, which comprises a datum and a coordinate system.
Longitudes can also be expressed in degrees, minutes and seconds (e.g. 150° 54' 45".98), see METeOR for this related item. A conversion to decimal degrees from the degrees, minutes and seconds format can be calculated with the following formula: Decimal Degrees = Degrees + ((Minutes / 60) + (Seconds / 3600)). (REF:
https://www2.landgate.wa.gov.au/slip/portal/home/
Graticule.html)
Usage example: -75° 59' 32.483" converts to -75.992356389 in decimal degrees (rounded up to 9 decimal places).
References
G-NAF: ADDRESS_DEFAULT_GEOCODE.LONGITUDE
NSW Point output: geoEastWestCoordinate