Also see the note regarding exporting GeoTIFFs from Triton Map.
The Gauss-Kruger projection is an example of a Transverse Mercator projection using 3deg zones (instead of the more usual 6deg zones used by the UTM projection). The reference ellipsoid is Krassovsky. Go to http://spatialreference.org to obtain the correct information, search for Beijing 1954:
The following page is displayed:
Select (for example) EPSG:2437, to get these parameters:
We need to enter the values for the Spheroid and Projection into the Map and Projection Settings dialog when making a mosaic in Isis/TritonMap or processing Bathy data in BathyPro:
The Input Projection is assumed to be Latitude and Longitude (Not Projected) WGS84 from the data in the XTF file.
Hit the Change button for the Output Projection, this will be the projection of our Mosaics and Bathy .DDS_VIF files and of our TritonMap project.
Select Transverse Mercator - hit Next
Enter the Central Meridian (120E) as the Longitude Origin, and 500000 as the False Easting- hit Next
Select "User Defined Datum" and enter the Krassovsky Maj Axis and Flattening - hit Finish:
Check that the Output Projection parameters are correct.
When a projection other than UTMs is used in Triton Map you will receive the following message when attempting to export a GeoTIFF image: (right click on layer>Export As)
To avoid this problem select TIFF Image (*.TIF) instead of GeoTIFF.
Triton Map will create an externally GeoReferenced TIFF with a .TFW (World File) follow this link for more information.