Geosoft mapping software for geophysics, geology, geochemistry
 

How To: Reproject a GDB into a new coordinate system

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Problem/Symptom:
How can I reproject a Geosoft GDB into a new projected coordinate system?

Environment:
Oasis montaj, and Target

Resolution
1) With the GDB open, go to the Coordinates | New Projected Coordinates

2) In the "Enter Existing Coordinate Channel" window verify the current X,Y channels are set correctly and click [Next].

3) The GDB's current projection is displayed in the first Coordinate System window in order for you to verify the projection is set correctly. Once you have verified this, click [OK]. NOTE: If the Coordinate System parameter is set to "Unknown," the GDB's projection has not yet been set and cannot be reprojected. Before continuing you will need to set the projection for your GDB. For tips on how to do this see the 'how to' article on setting the projection of a Geosoft GDB.

4) In the "Create New Coordinate Channels" window, either select two existing channels or define two new channels which will be populated with the newly projected X,Y coordinates and click [Next].

5) In the Coordinate System Window set the new projection and click [OK].

Additional Info:
Projected (x,y): View or define a projected coordinate system. The units of length in a projected coordinate system are linear (i.e. not degrees). A projected coordinate system contains units, a datum, an optional local datum transform, and a projection method that projects the location on the spherical (ellipsoidal) system onto a plane.

Geographic (long,lat): View or edit a geographical coordinate system. A geographical coordinate system is specified in angular units (always degrees) and specifies a location on the earth. It is specified by its datum, and, optionally, by a local datum transform.