surfacevel2strain ("surface velocity to strain rate")
contact: Carl Tape, University of Alaska Fairbanks, ctape@alaska.edu

download the zipped file or use this command:
git clone --depth=1 https://github.com/carltape/surfacevel2strain

Carl Tape, Pablo Muse, Mark Simons

A Matlab code for a a spherical-wavelet-based estimation of velocity fields on the sphere from discrete 3-component (or 2-component) GPS observations.

Reference:
Tape, C., P. Muse, M. Simons, D. Dong, and F. Webb, 2009, Multiscale estimation of GPS velocity fields, Geophysical Journal International, v. 179, p. 945-971.

Step 0: note the directories in surfacevel2strain:
gmt -- Perl scripts for plotting in GMT
data -- input data files
matlab -- matlab codes (surfacevel2strain.m)
matlab_output -- output files from matlab
USER_INFO -- PDF notes and documentation

Step 1: read the documentation in USER_INFO/:
surfacevel2strain_manual.pdf
Tape2009gps.pdf
Tape2009gps_supplement.pdf

Step 2:
cd matlab
Start with sphereinterp.m, the 1D example shown in surfacevel2strain_manual.pdf

Matlab toolboxes required:
mapping -- areaquad.m, distance.m, etc
(In the future it would be nice to eliminate dependencies on other toolboxes.)

https://sites.google.com/alaska.edu/carltape/home/research/strain