mbsegylist
Section:  MB-System 5.0  (1)
Updated:  3 June 2013 
Index


 
NAME

mbsegylist - List selected header values in segy format seismic data files.

 
VERSION

Version 5.0

 
SYNOPSIS

mbsegylist [-A -Ddecimate
-H -Gdelimeter -Iinfilename
-Llonflip -Ooutput_format
-Ucheck -V -Zsegment]

 
DESCRIPTION

MBsegylist is a utility to output specified header values
from segy seismic data files to stdout. The
option -Ooutput_format is
used to control the type and order of values output.
By default, mbsegylist  produces ASCII files in
spreadsheet style, with data columns separated by tabs. Alternatively,
the output can be binary, with each field represented
as a double precision float (-A option).

 
AUTHORSHIP

David W. Caress (caress@mbari.org)




  Monterey Bay Aquarium Research Institute



Dale N. Chayes (dale@ldeo.columbia.edu)




  Lamont-Doherty Earth Observatory

 
OPTIONS


-A





Causes the output to be binary (native double precision floating
point) rather than ASCII. Some
output options cannot be represented as single binary floats (e.g.
time strings and longitude or latitude broken into degrees
and minutes. These values are output as multiple fields as
appropriate.
Default: ASCII output with fields separated by tabs.
-D


decimate



Sets the decimation of the output data. By default (i.e. decimate=1),
every available data record is output. If decimate>1, then only
every "decimate"th record will be output. Default: decimate=1.
-G


delimiter



Sets the character(s) used to separate output fields when ascii
columns are output. Default: tabs are used as delimiters.
-H


This "help" flag cause the program to print out a description
of its operation and then exit immediately.
-I


filename



Sets the filename of the input segy seismic data file.
-L


lonflip



Sets the range of the longitude values returned.
If lonflip=-1 then the longitude values will be in
the range from -360 to 0 degrees. If lonflip=0
then the longitude values will be in
the range from -180 to 180 degrees. If lonflip=1
then the longitude values will be in
the range from 0 to 360 degrees.
Default: lonflip = 0.
-O


output_format



Determines the form of the output; output_format is a string composed
of one or more of the following characters:

/
special character: this causes the value
indicated by the next character to be  inverted. This applies only to simple
numeric values such as depth and
heading and not to values like time
strings orpositions with hemisphere
characters.

-
special character: this causes the value
indicated by the next character to be
multiplied by -1. This applies only
to simple numeric values such as
depth and heading and not to values
like time strings or positions with
hemisphere characters.

C
for CMP (or RP or CDP) gather number of a trace

c
for trace number within a CMP (or RP or CDP) gather

D
for trace start delay (seconds)

I
for sample length (seconds)

i
for time interval since last trace (seconds)

J
for a time string (yyyy jd hh mm ss.ssssss)
where jd is the day of the year

j
for a time string (yyyy jd dm ss.ssssss)
where jd is the day of the year
and dm is the minute of the day

L
for trace length (seconds)

M
for unix (epoch) time in decimal seconds since 1/1/70 00:00:00

m
for time in decimal seconds since first record

N
for number of samples in the trace

n
for trace counter (starts from 0)

R  for range from source to receiver (m)

S  for shot number

s  for trace number within a shot gather

T  for a time string (yyyy/mm/dd/hh/mm/ss)

t  for a time string (yyyy mm dd hh mm ss)

U  for unix time in integer seconds since 1/1/70 00:00:00

u  for time in integer seconds since first record

V  for shot or ping interval (decimal seconds)

X  for longitude (decimal degrees)

x  for longitude (degrees + decimal minutes + E/W)

Y  for latitude (decimal degrees)

y  for latitude (degrees + decimal minutes + N/S)

Z  for source or sonar depth (positive downwards) (m)

z  for depth (positive downwards) (m)




Default output_format = TiXYSsCcDINL
(time, time interval, lon, lat, shot, shot trace #, cmp, cmp trace #,
delay, sample length, number samples, trace length)
-V


Normally, mbsegylist works "silently" without outputting
anything to the stderr stream.  If the
-V flag is given, then mbsegylist works in a "verbose" mode and
outputs the program version being used and all error status messages.
-Z


segment



Causes the ascii output of different input segy files
(e.g. when a datalist is specified with the -I option)
to be separated by lines with segment. If segment
is a single character, then the output is a multiple segment
file of the sort accepted by the GMT program psxy.
This option only works with ascii output, and is thus disabled
when the -A option is specified. The most common usage
is -ZI>.


 
EXAMPLES

Suppose one has a subbottom profiler segy data file called
20040722_152111.s7k.segy.

In order to obtain a listing of the shot number, time tag, and position
of the traces in the file, use mbsegylist as follows:

        mbsegylist -I 20040722_152111.s7k.segy -OSTXY


The output will be as follows:


    56  2004/07/22/15/20/37.029000      -121.857289       36.775508

    57  2004/07/22/15/20/37.590000      -121.857289       36.775514

    58  2004/07/22/15/20/38.152000      -121.857289       36.775519

    59  2004/07/22/15/20/38.713000      -121.857289       36.775525

    60  2004/07/22/15/20/39.275000      -121.857289       36.775531

    61  2004/07/22/15/20/39.837000      -121.857289       36.775536

    62  2004/07/22/15/20/40.398000      -121.857289       36.775542

    63  2004/07/22/15/20/40.960000      -121.857289       36.775547

    64  2004/07/22/15/20/41.521000      -121.857289       36.775553

        .....


 
SEE ALSO

mbsystem(1), mbextractsegy(1), mbsegyinfo(1), mbsegygrid(1),
SIOSEIS(http://sioseis.ucsd.edu/ )

 
BUGS

Si. Oui. Ya. Da. Yes. Mess.



 
Index

NAME

VERSION

SYNOPSIS

DESCRIPTION

AUTHORSHIP

OPTIONS

EXAMPLES

SEE ALSO

BUGS

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