NAME
navmerge - routine to merge raw marine seismic acquisition
data with processed UKOOA_SEGP navigation data.
SYNOPSIS
navmerge [ -Nntap ] [ -Ootap ] [ -Uutap ] [ -Sstap ] [ -sist
] [ -eiend ] [ -nsnstr ] [ -nenetr ] [ -rsnrst ] [ -renred ]
[ -vvel ] [ -V ] [ -? or -h or -help ]
DESCRIPTION
navmerge reads in seismic data in USP format and associated
UKOOA SEGP navigation data. The source and receiver posi-
tions are loaded to the seismic data. In addition the
signed trace distance is calculated and installed. An addi-
tional skips file may be attached if there are missing
shots. Any missing records will be padded with dead traces
but also contain navigation data as it was recorded. The
seismic and navigation data MUST be in sync in their asso-
ciated files. No attempt is made to check if one or the
other is reversed [which shouldn't be the case if both the
seismic and the navigation data are from the field acquisi-
tion].
navmerge gets both its data and its parameters from command
line arguments. These arguments specify the input, output,
the navigation file, an optional shot skips file, the start
and end time to pass, the start and end traces, start and
end records, the water velocity to store in the line header
and verbose printout, if desired.
Command line arguments
-N ntap [default: stdin]
Enter the input data set name or file immediately after
typing -N unless the input is from a pipe in which case
the -N entry must be omitted. This input file should
include the complete path name if the file resides in a
different directory. Example -N/b/vsp/dummy tells the
program to look for file 'dummy' in directory '/b/vsp'.
-O otap [default: stdout]
Enter the output data set name or file immediately
after typing -O. This output file is not required when
piping the output to another process. The output data
set also requires the full path name (see above).
-U utap [default: none]
Enter the file name of the UKOOA SEG_P navigation data
file.
-S stap [default: not used]
Enter the file name of the optional skips file. Enter
any missing field shot point numbers one per line.
These must be in the same numbering system as the field
acquisition.
-s ist [default: 0]
Global start time (ms).
-e iend [default: time of last sample]
Global end time (ms).
-ns nstr [default: 1]
Enter the start trace number.
-ne netr [default: last trace of record]
Enter the end trace number.
-rs nrst [default: 1]
Enter start record number.
-re nred [default: last record]
Enter end record number.
-v vel [default: 1500]
Enter the water velocity to be stored in the lineheader
entry WatVel.
-V Enter the command line argument '-V' to get additional
printout.
-? or -h or -help
Enter the command line argument '-?' or -h or -help
to get online help. The program terminates after the
help screen is printed.
DISCUSSION
The navigation file at present must contain only the nav
data for the current line. I have still to receive from
Hammouda an example of the full processed tape that comes
back from the contractor. If you wish to use this routine
for more than one line at a time and have such a tape, give
me a call. In the mean time here is an example of the for-
mat of the navigation file:
V95MED3D-1096 1 101315936.01N 314613.58E
687808.21031261.8 123.2212094512
A95MED3D-1096 1 101315935.21N 314614.50E
687832.31031237.3 123.2212094512
T95MED3D-1096 1 1 10132 1 3.02N 314350.93E
684045.31033916.1 123.2212094512
T95MED3D-1096 1 2 10132 1 5.75N 314353.33E
684107.61034000.4 123.2212094512
T95MED3D-1096 1 3 10132 1 7.61N 314355.83E
684172.81034058.3 123.2212094512
T95MED3D-1096 1 4 10132 110.54N 314357.83E
684224.81034148.8 123.2212094512
E95MED3D-1096 1 101315934.86N 314615.36E
687855.11031226.5 123.2212094512
Z95MED3D-1096 11 101315940.42N 3146 4.90E
687579.31031395.9 123.2212094512
Z95MED3D-1096 12 101315941.70N 3146 5.92E
687605.81031435.6 123.2212094512
S95MED3D-1096 11 101315940.42N 3146 4.90E
687579.31031395.9 123.2212094512
R 1 687369.81031405.9 2 687349.51031420.7 3
687329.21031435.6 1
R 4 687308.91031450.4 5 687288.71031465.2 6
687268.41031480.0 1
R 7 687248.11031494.8 8 687227.91031509.6 9
687207.61031524.4 1
R 10 687187.41031539.2 11 687167.21031554.0 12
687147.01031568.9 1
R 13 687126.81031583.7 14 687106.61031598.6 15
687086.41031613.5 1
R 16 687066.21031628.4 17 687046.11031643.4 18
687025.91031658.3 1
R 19 687005.81031673.3 20 686985.71031688.3 21
686965.51031703.2 1
R 22 686945.41031718.2 23 686925.31031733.2 24
686905.21031748.2 1
R 25 686885.01031763.2 26 686864.91031778.1 27
686844.81031793.1 1
.
.
.
R 625 684670.51033811.8 626 684650.51033826.9 627
684630.51033841.9 4
R 628 684610.51033857.0 629 684590.51033872.0 630
684570.51033887.1 4
R 631 684550.51033902.1 632 684530.51033917.1 633
684510.51033932.1 4
R 634 684490.51033947.2 635 684470.41033962.2 636
684450.41033977.3 4
R 637 684430.51033992.4 638 684410.51034007.5 639
684390.61034022.7 4
R 640 684370.81034037.9
4
The program identifies the current shot location if the
first letter on the line is 'S' and assumes that everyting
starting with 'R' refers to receiver locations.
SEE ALSO
maip(1) laip(1) pr3d(1) prepr3d(1)
AUTHOR
[P.G.A. Garossino: ATTC:3932 pgarossino@amoco.com]
COPYRIGHT
copyright 2001, Amoco Production Company
All Rights Reserved
an affiliate of BP America Inc.
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