Transfer Custom Coordinate Systems Between SonarWiz Versions 7.09.04 and Earlier

Owned by David Finlayson
Last updated: 2022-10-11
2 min read

Custom coordinate systems can be transferred between SonarWiz installations by sharing special GXP files created for this purpose. Each custom coordinate system is composed of two entries in the geodetic database, the first is stored in the Latitude / Longitude group and has a “.LL” extension appended to the name. The second is stored in the User Defined Coordinate Systems group. When you transfer a custom coordinate system between SonarWiz installations, you must export both versions as GXP files and you must import both GXP files for the custom coordinate system to function properly in the new installation.

If you have requested a coordinate system from CTI Technical Support, we will provide you with both GXP files necessary to use the new system. Skip down to the section on Importing a Custom Coordinate System from disk and be sure to import both GXP files provided.

To Export a Custom Coordinate System to disk:

  1. Select the Custom Coordinate System you want to export.

  2. Click the Export button and save the coordinate system to disk.

     

     

  3. Repeat steps 1 and 2 for the “LL” version of the coordinate system.

 

To Import a Custom Coordinate System from disk

Note that you will need a pair of GXP files. The first should define the transformation from WGS84 to the Custom Datum (the “LL” version as specified above). The second should define both a transformation to the custom datum and a map projection (the “plain” non-LL version).

  1. Click Import on the CTI GeodesyTools toolbar

     

  2. Select the first GXP file in the pair and click Open.

  3. Repeat the process for the second GXP file.

  4. Verify that two coordinate systems were imported. The first should be listed under the Latitude / Longitude group, the second should be listed under the User Defined Coordinate Systems group.

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