bagl - BSU program computes angle between two data sets (C-Language Version)
bagl [ -h | infile1 | infile2 | tmin | tmax ]
Basic Seismic Utilities (BSU) program computes angle in degrees between traces in two data sets. Innerproduct is taken for each trace pair. The acosine of the innerproduct normalized by the L2 norms of each trace in the pair gives the angle. If traces are the same, then the angle will be zero. If they are orthogonal, the angle returned will be 90 degrees. If one data set is the negative of the other, the angle will be 180 degrees.
NOTE:
Two data sets must have same number of traces, samples, and
sample interval.
Options
|
-h |
Online help giving details on command line arguments |
infile1
First argument is the first input file name
infile2
Second argument is the second input file name
|
tmin |
This is the start time in seconds for the analysis window. | ||
|
tmax |
This is the end time in seconds for the analysis window. The dimension of the vector space is set by the number of samples between tmin and tmax. |
NOTE:
If invoked with no options, will prompt user for input
parameters.
EXAMPLE:
bagl w001.seg wavV.seg 0. 0.5
Files w001.seg and wavV.seg are processed by bagl. For example, maybe wavV.seg is a synthetic seismogram meant to match w001.seg (perhaps in a full wave inversion scheme). The angles between traces are a measure of how close the synthetic matches the field data. The ideal case would be an angle of zero for each trace.
baglxxxx.dat
named according to convention (first 4char bagl, the next 4char are the first 4char of the input file name, suffix .dat). This is a text file which lists 2 columns, (trace number, angle).
standard output
produces a progress bar
baglxxxx.lst
Echo check of input parameters in listing file.
bhelp(1), c_bsegin(3), bargrid(3), exbar(3), in_chk(3), c_bsegy(5)
no known bugs
Copyright © 2022 by Paul Michaels
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
P. Michaels, PE. <paulmichaels@boisestate.edu>