3D Fractional Order Sunshaded Image

Sunshaded image overlain on original data in 3D.

This image shows the aeromagnetic data over Sudbury in Canada (greyscale, on left), plus the processed image (colour, 3D, on the right).
See ;
Cooper, G.R.J., and Cowan, D.R., 2003. Sunshading Geophysical Data Using Fractional Order Horizontal Gradients
The Leading Edge v.22 no.3 p.204-205.

Cooper, G.R.J., and Cowan, D.R., 2003. The Application of Fractional Calculus to Potential Field Data.
Exploration Geophysics v.34 no. 4 p.51-56.

for more details, or e-mail me and I'll send you the papers in pdf format.