The example in rsf/tutorials/spitz reproduces the tutorial from Karl Schleicher on the Spitz method for signal and noise separation, presented at the 2014 SciPy conference. The implementation is different, with Claerbout’s T-X helical filters instead of Spitz’s and Schleicher’s F-X filters.

For more explanation, see:

• Spitz, S., 1999, Pattern recognition, spatial predictability, and subtraction of multiple events: The Leading Edge, 18, 55–58.
• J. F. Claerbout and S. Fomel, 2000, Spitz makes a better assumption for the signal PEF: Stanford Exploration Project, SEP-103, 211-219.

Madagascar users are encouraged to try improving the results.