What are constraints and are they required?

Geophysical inversion is non-unique, meaning there are many different distributions of physical property that can give rise to the same measured data. Without constraints, the resulting Occam's inversion will be smooth and the causative bodies will have the tendency to congregate closer to the surface. Therefore, auxiliary information can be used to constrain an inversion. Prior knowledge, from drilling for example, can be used to impose and fix known information, forcing the resulting voxel model towards the solution that is closer to the actual geological structure.

 

Is it easy to create constraints?

All VOXI constraints are input as voxel models. Voxels can be created using the Oasis montaj 3D tools. The ease of creating voxels depends on your experience with these tools.

 

Is there documentation on how to create voxels to be used as constraints?

See the Best Practice Guides "Creating an Upper Bound Voxel" and "Creating Gradient Weighting Voxels" on the VOXI Learning Centre page.  Also see the How-to Guides: "Run Inversion with an Upper Bound Constraint" and "Run Inversion with Gradient Weighting".