Constraints

Overview

Geophysical inversion is inherently non-unique, that is there are numerous different models which can give rise to very similar responses, all of which reside within a narrow error envelop. Therefore, auxiliary information beyond the data itself must be used to direct the inversion outcome toward the model that best aligns with the auxiliary a priori information. The Constraints branch found in the VOXI  tree viewer is the mechanism through which you can impose conditions that favour a specific behaviour over any other alternative.

Note that all VOXI forward and inverse responses are constrained. By choosing not to set custom constraints, you effectively accept the default constraints that VOXI calculates.

All constraints are implemented in terms of either a default, a constant value, a voxel or a vector voxel model. After choosing the constraint type you will be prompted to supply the applicable information .

The list of implemented constraints is given at the end of this document; each constraint is explained in its own right,on a dedicated separate page.

Not all constraints are applicable to all model types:

• When running a forward model response calculation, the only applicable constraint is the Starting model . Indeed in its absence, the forward model response calculation remains disabled.

• All the constraints can be used when inverting density or susceptibility voxel models.

VOXI Constraints

Click on the links below to see more details about a particular type of constraint.