SYNOPSIS
PERL PROGRAM NAME:
AUTHOR: Juan Lorenzo (Perl module only)
DATE:
DESCRIPTION:
Version:
USE
NOTES
Examples
SYNOPSIS
SEISMIC UNIX NOTES DT1TOSU - Convert ground-penetrating radar data in the
Sensors & Software X.DT1 GPR format to SU format.
dt1tosu < gpr_data_in_dt1_format > stdout
Optional parameters:
ns=from header number of samples per trace
dt=.8 time sample interval (see below)
swap=endian endian is auto-determined =1 (big endian) swap
=0 don't swap bytes (little endian machines)
verbose=0 silent
=1 S & S header values from first trace
sent to outpar
=2 S & S header values from all traces
sent to outpar
outpar=/dev/tty output parameter file
list=0 silent
=1 list explaining labels used in verbose
is printed to stderr
Caution: An incorrect ns field will munge subsequent processing.
Notes:
For compatiblity with SEGY header, apparent dt is set to
.8 ms (800 microsecs). Actual dt is .8 nanosecs.
Using TRUE DISTANCES, this scales velocity
and frequency by a factor of 1 million.
Example: v_air = 9.83X10^8 ft/s (real)
v_air = 983 ft/s (apparent for su)
Example: fnyquist = 625 MHz (real)
fnyquist = 625 Hz (apparent for su)
IBM RS6000, NeXT, SUN are examples of big endian machines
PC's and DEC are examples of little endian machines
Caveat:
This program has not been tested on DEC, some modification of the
byte swapping routines may be required.
Credits:
CWP: John Stockwell, Jan 1994 Based on a code "sugpr" by
UTULSA: Chris Liner & Bill Underwood (Dec93)
modifications permit S & S dt1 header information to be transferred
directly to SU header
March 2012: CWP John Stockwell updated for the revised
S&S DT1, which they still call "DT1" though it is different.
Trace header fields set: ns, tracl, tracr, dt, delrt, trid,
hour, minute, second
Reference: Sensors & Software pulseEKKO and Noggin^plus Data File
Formats
Publication of:
Sensors & Software: suburface imaging solutions
1091 Brevik Place
Mississauga, ON L4W 3R7 Canada
Sensors & Software In
Tel: (905) 624-8909
Fax (905) 624-9365
E-mail: sales@sensoft.ca
Website: www.sensoft.caUser's Notes (Juan Lorenzo)
Untested
CHANGES and their DATES
Import packages
instantiation of packages
Encapsulated hash of private variables
sub Step
collects switches and assembles bash instructions by adding the program name
sub note
collects switches and assembles bash instructions by adding the program name
sub clear
sub dt
sub fnyquist
sub list
sub ns
sub outpar
sub swap
sub v_air
sub verbose
sub get_max_index
max index = number of input variables -1