The datum mapping file provides definitions for datums that are unknown to CARIS. Each definition can be provided as either an EPSG datum ID or as a Well Known Text (WKT) definition. All datum definitions must be transformable to the WGS 1984 datum.
Datum mapping support files are located in the gdalsupport folder ( |
EPSG datum ID
The following EPSG transformation methods are supported:
• EPSG::9603 - Geocentric translations (geog2D domain) For example,
<!-- EPSG::9603 - Geocentric translations (geog2D domain) --> <cdl:Datum> <cdl:Name>Guam_1963</cdl:Name> <cdl:EPSG xlink:href="urn:ogc:def:datum:EPSG::6675"/> </cdl:Datum> |
• EPSG::9606 - Position Vector transformation (geog2D domain). For example,
<!-- EPSG::9606 - Position Vector transformation (geog2D domain) --> <cdl:Datum> <cdl:Name>OSNI_1952</cdl:Name> <cdl:EPSG xlink:href="urn:ogc:def:datum:EPSG::6188"/> </cdl:Datum> |
• EPSG::9607 - Coordinate Frame Rotation (geog2D domain). For example,
<!-- EPSG::9607 - Coordinate Frame Rotation (geog2D domain) --> <cdl:Datum> <cdl:Name>Amersfoort</cdl:Name> <cdl:EPSG xlink:href="urn:ogc:def:datum:EPSG::6289"/> </cdl:Datum> |
WKT definition
Several WKT definitions are supported.
When providing a WKT definition using the EPSG::9606 method, the 'TOWGS84' element must be specified. |
The following is an example definition from datummapping.xml, in C:\Program Files\CARIS\Caris\<version>\system.
<!-- GCS_WGS_84 --> <cdl:Datum> <cdl:Name>World_Geodetic_System_1984</cdl:Name> <cdl:EPSG xlink:href="urn:ogc:def:datum:EPSG::6326"/> <cdl:WellKnownText>DATUM["World Geodetic System 1984", SPHEROID["WGS 84",6378137,298.2572201434276], TOWGS84[0,0,0,0,0,0,0]]</cdl:WellKnownText> </cdl:Datum> |