CARIS HIPS and SIPS : Support Files : Datum Mapping
 

Datum Mapping

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 (C:\Program Files\CARIS\Caris\<version>\system\gdalsupport).

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>