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Colin Zelt et al. 2013 blind test is available at

http://scholarship.rice.edu/handle/1911/72113

For our expanded abstract presented at SAGEEP14 in Boston MA see

http://rayfract.com/pub/sageep14.pdf

We now use Conjugate Gradient method for WET inversion, as an alternative to our default Steepest Descent method. See

http://rayfract.com/help/release_notes.pdf

for latest version 3.31 and

http://www.cs.cmu.edu/%7Equake-papers/painless-conjugate-gradient.pdf

on Conjugate Gradient theory.

Also, we now allow Gaussian weighting for smoothing instead of uniform weighting, for improved resolution.

For updated .pdf reference see

http://rayfract.com/help/rayfract.pdf

. For demonstration of new Conjugate Gradient WET inversion see updated

http://rayfract.com/tutorials/ZONDDATA.pdf

We now allow conversion of layered .CSV refractors to layered .GRD starting model. See updated release notes

http://rayfract.com/help/release_notes.pdf

and updated brochure

http://rayfract.com/pub/prospect.pdf

For instructions on how to

- map traces to refractors
- Plus-Minus refraction interpretation
- export depth section and refractors to .CSV and
- convert .CSV to Surfer .GRD see

http://rayfract.com/tutorials/SAGEEP11_13.pdf

last page.

We also show Conjugate Gradient WET inversion using this Plus-Minus layered .GRD starting model.

Updated help file installer at

http://rayfract.com/help/winhelp.exe

During layered refraction interpretation and time-to-depth conversion, we now automatically

- export layered depth section to .CSV and .GRD
- display the .GRD layered starting model in Surfer and
- prompt you to run WET inversion using this starting model. See

http://rayfract.com/help/release_notes.pdf

Our new tutorial

http://rayfract.com/tutorials/NORCAL14.pdf

compares using a 1D gradient starting model with layered CMP refraction starting model, with user-specified overburden velocity.

Our latest version 3.33 supports multiscale tomography with our new multirun WET inversion. See

http://rayfract.com/pub/sageep14.pdf

and updated release notes

http://rayfract.com/help/release_notes.pdf

and updated help file installer

http://rayfract.com/help/winhelp.exe

For our latest tutorial showing multiscale tomography of tunnel overburden see

http://rayfract.com/tutorials/CFE15.pdf