SMOOTHINT2 - SMOOTH non-uniformly sampled INTerfaces, via the damped least-squares technique

smoothint2 <input ninf= >output [optional parameters]

Required Parameters:
<input file containing original interfaces
>output file containing smoothed interfaces

Optional Parameters:
ninf=5 number of interfaces
r=100 smoothing parameter
npmax=101 maximum number of points in interfaces

Notes:
The input file is an ASCII file. Each interface is represented by pairs
(non-uniform sampling) of x and z values, with one pair of values on
each line, separated by spaces or tabs. Each interface is separated with
an entry with a large negative z value for example: 1.0 -9999.
There is no entry for the surface. The surface is assumed to be flat
with z=0.
This is similar to a CSHOT model file without a surface entry and
without comments.

The smoothing method is analogous to a moving window averaging process
(but not the same) with the parameter "r" being analogous to the "width
of the window. Thus, the size of "r" must be chosen to by compatible
with the scale (wavelengths) of the variations of the interfaces in the
model being smoothed.

Example using the test data set generated by unif2:
unif2 tfile=tfilename
Compare the unsmoothed interface model:
unif2 < tfilename method=interpolation_method |
psimage n1=100 n2=100 d1=10 d2=10 | ...
To the smoothed interface model:
smoothint2 r=100 < tfilename | unif2 method=interpolation_method | ",
psimage n1=100 n2=100 d1=10 d2=10 | ...



Credits:
CWP: Zhenyue Liu, Jan 1994
Reference:
Liu, Zhenyue, 1994, Velocity smoothing: theory and implementation,
Project Review, 1994, Consortium Project on Seismic Inverse Methods
for Complex Stuctures (in review)