Does Tomofast support cross-gradient inversion using velocity model？

[WanZiXuan]

Hi, Thanks for sharing the code! I'm tring to add structual similarity constaints into gravity anomaly inversion using velocity model, however, the program seem to only support cross-gradient inversion between grav and magnetic data. I'd like to konw if Tomofast support cross-gradient inversion using other type of geophysics model?

[vogarko]

Yes, you can use the magnetic problem for velocity model, and set magnetic starting model to your velocity model. To achieve this use the following Parfile parameters:

inversion.startingModeling.type=2 inversion.startingModeling.magn.file= Your velocity model inversion.startingModeling.grav.file= Model with zeros

Also use the following setting for the cross gradient constraint: inversion.crossGradient.magn.keepModelConstant = 1

And set the low problem weight for the mag problem (to ignore its data term): inversion.joint.grav.problemWeight = 1.d0 inversion.joint.magn.problemWeight = 1.d-30

[WanZiXuan]

Thanks for your reply！I will try it.