Talk:geodeticDatum

[KCP note: I believe this may need more exmplanation or better examples and/or links. This is copied from DWC, but I think we may want to repeat some of this here? Or simply put a link to this DWC explanation?:

Notes: Ideally one should use a standard European Petroleum Survey Group (EPSG) code to a Spatial Reference System as a value for this term. The recommended controlled vocabulary is to use a value consisting of the string "EPSG:" followed by a valid EPSG code corresponding to the spatial reference system used for the geographic coordinates in the terms decimalLatitude and decimalLongitude.

A good resource for determining the EPSG code from the Datum name can be found at http://spatialreference.org/.

Some common EPSG codes and the Datums they use can be found below:

EPSG:4326: WGS84 EPSG:4269: NAD83 EPSG:4267: NAD27 If you don't know the details of the SRS, then it is permissible to provide the name or code of the geodetic datum for the decimalLatitude and decimalLongitude coordinates. Sometimes this information is not on the original source (such as a map), while an ellipsoid name is given. In this case, provide the name of the ellipsoid. If the spatial reference system, datum, or ellipsoid are not known, use the value "unknown" for this term.

A good reference for datum and ellipsoid names is http://www.colorado.edu/geography/gcraft/notes/datum/edlist.html

See dcterms:Location for further discussion of georeference terms.

Example(s): t"EPSG:4326", "WGS84", "NAD27", "Campo Inchauspe", "European 1950", "Clarke 1866"]