dwc:geodeticDatum

Schemes: Darwin Core , Vegetation Survey 
Collections: Darwin Core Location , Vegetation Survey Location 

Geodetic Datum URI: http://rs.tdwg.org/dwc/terms/geodeticDatum is defined by http://rs.tdwg.org/dwc/terms/ skos: has close match   abcd:DataSets/DataSet/Units/Unit/Gathering/SiteCoordinateSets/SiteCoordinates/CoordinatesLatLon/SpatialDatum

Issued: 2008/11/19 Modified: 2009/07/06

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Geodetic Datum: The ellipsoid, geodetic datum, or spatial reference system (SRS) upon which the geographic coordinates given in decimalLatitude and decimalLongitude as based. Recommended best practice is use the EPSG code as a controlled vocabulary to provide an SRS, if known. Otherwise use a controlled vocabulary for the name or code of the geodetic datum, if known. Otherwise use a controlled vocabulary for the name or code of the ellipsoid, if known. If none of these is known, use the value "unknown".

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"

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Translations

Español (Spanish)

Datum Geodésico: El elipsoide, datum geodésico, o sistema de referencia espacial (SRS) en el que se basan las coordenadas geográficas provistas en Latitud Decimal y Longitud Decimal. La práctica recomendada es usar el código EPSG como un lenguaje controlado para proporcionar un SRS, si se conoce. Caso contrario, utilice un lenguaje controlado para el nombre o código del datum geodésico, si se conoce. Caso contrario, utilice un lenguaje controlado para el nombre o código del elipsoide, si se conoce. Si nada de esto se sabe, utilice el valor "desconocido".

Ejemplo: "EPSG:4326", "WGS84", "NAD27", "Campo Inchauspe", "European 1950", "Clarke 1866".

中文（简体）‎ (Simplified Chinese)

大地基准: 椭圆体、大地基准点或空间参考系统的地理坐标以十进制经度和纬度为基础。建议最佳做法是如果已知EPSG编码，使用其作为控制性词汇规定一个空间参考系统。或者使用已知的控制性词汇作为大地基准点的名称或编码。或者使用已知的控制性词汇作为椭圆体的名称或编码。如果这些都未知，则使用“未知”值。

日本語 (Japanese)

Geodetic Datum: decimalLatitudeとdecimalLongitudeで与えられる地理座標についての楕円体、経緯度原点、空間参照システム。もしわかるのであれば、空間参照システムから提供されるEPSGコードなどの管理された語彙の使用が推奨される。そうでない場合は、経緯度原点の名前またはコードについての管理された語彙の使用が推奨される。それも困難であれば、楕円体についての名前またはコードについての管理された語彙の使用が推奨される。それも無理の場合は、"unknown"を使用する。

Français (French)

Système géodésique: L'ellipsoïde, système géodésique ou système de coordonnées sur lequel les coordonnées géographiques données dans decimalLatitude et decimalLongitude sont basées. Il est recommandé d'utiliser le code EPSG comme vocabulaire contrôlé pour indiquer le système de coordonnées, s'il est connu. Dans le cas contraire, utiliser un vocabulaire contrôlé pour le nom ou code de l'ellipsoïde, s'il est connu. Si aucun des deux n'est connu, utiliser la valeur "inconnu".

Exemple: "EPSG:4326", "WGS84", "NAD27", "Campo Inchauspe", "European 1950", "Clarke 1866".