Error Message "Unable to determine cell sizes for non-uniform Voxel side X (or Y) with x points".

Problem:

I am trying to create a voxel from an XYZ file but I get the error:

"Unable to determine cell sizes for non-uniform Voxel side X (or Y) with x points".

Environment:

Oasis montaj, Target and Target for ArcGIS

Resolution:

In Oasis montaj or Target:

1. Database menu > Import > Geosoft XYZ
2. Enter a New database name for the Geosoft database that will be created and click OK
3. Browse to the XYZ data file to import and click OK
4. Coordinates menu > Set Current X,Y,Z Coordinates
5. 3D menu > Voxel Gridding > select the appropriate channel for Data to grid and click OK

In Target for ArcGIS:

To import the XYZ into a Geosoft database:

1. Download and install the Oasis montaj Viewer
   
2. Launch the Viewer > File menu > Project > New
   
3. Database menu > Import > Geosoft XYZ
   
4. Browse to the Geosoft XYZ file to import and click OK
   
5. File menu > Project > Save

To set the current XYZ channels for the database:

1. Load the Geosoft Database toolbar in ArcMap
   
2. Geosoft Data > Open Geosoft Database > select the *.gdb you created in the Viewer and click Open
   
3. Geosoft Data > Coordinates > Change X/Y Coordinates > set the current XYZ channels and click OK

To create a voxel from a Geosoft database that is not part of the drillhole project:

1. Load the Target Drillhole toolbar in ArcMap
   
2. Voxels > 3D Gridding from Current Geosoft Database
   
3. Select the appropriate channel for Data to grid > click OK
   
4. Add the voxel to a new or existing 3D View

Root Cause:

This error message is returned when the values for the X, Y or Z channels (fields) in the XYZ file are not uniformly spaced. The workaround is to import the XYZ file into a Geosoft Database first. Geosoft is able to interpolate uniform spacing for the XYZ channels during voxel creation when the data is store in a Geosoft database as opposed to an XYZ file.

Since Target for ArcGIS is not able to import data from an XYZ file that is not part of a drillhole project, the Oasis montaj Viewer must be used to perform this operation.