Version 96.1219
Xest - batch phase picking software
These notes pertain to version 96.1219
Xest ( SEGY_files ) [ -d ] [-g] [-r] [-h]
Xest is a program used to run FORTRAN subroutines developed by A. Kushnir and others for autoregressive analysis of time series. Useful functions include phase detection, estimation of onset times, and reconstitution filtering. Xest is a batch picker often used in conjuction with Xphase, which is an interactive version of the same routines.
Xest was developed on a SUN SPARCstation LX running Solaris 2.3, and compatibility with other environments should not be assumed. It is a fairly straightforward program, however, so modifications should not be extensive.
| -g | Do not convert from digital counts to volts. The SEGY data is presumed to be in digital counts, and the default is the convert this number to volts using the scaleing values in the header. Specifying the -g option skips this conversion. |
| -d | Operate in detect mode only (no picking). This is useful as a pre-processing step. |
| -r | Reset the origin time so the the first sample of all files is at time 0:0:0.0. This is a useful option if files with very different origin times are viewed simultaneously. |
| -h | Prints out the usage summary. |
Xest basically does the same thing as the "DETECT/EST" function in Xphase, and as most of the functions are described in that manual they will not be repeated here. Detection parameters can be read in with a preferences file called "Xest.prefs" which is in the same format as the Xphase.prefs file described in that manual.
Xest can also be run in a "detection only" mode for processing of continuous data files. Use the "-d" argument to do this, and set the noise window to be the same length as the data window (this is the default for the -d option, so just don't specify anything in the preferences file.
Xphase
Steve Roecker
roecker@harold.geo.rpi.edu
Thanks to Alex Kushnir for allowing me to use his FORTRAN routines. Also, the routines to read segy files and parse arguments were modified from routines in the program "segy2sac" written by Tim Ahern, Jim Fowler and Richard Boaz of PASSCAL.
Send bug reports to: roecker@harold.geo.rpi.edu