Product: IESX
Version: GeoFrame 3.7
Application: DataManager
Search Type: FAQ
Topic:
A simple method to dump Inline and Xline numbers that are in the extended header.
Description:
A user wants to dump a few thousand traces of seismic data to see what is on a
tape. The Inline and Crossline numbers are found in Header words 201-204, and
221-224, respectively. Dumping the full header is cluttered, and difficult to
analyze quickly.
Solution:
An easy and concise method of dumping Inline and Xline values is to use the
"Scan tape" option under SEGY Dump...
Scan Tape will dump Shotpoint and CDP numbers for each trace. It can be
"tricked" into dumping any header words needed, outputting only one line per
trace.
From IESX> Data Manager> Load Seismic> SEGY Dump..., there is an option to
specify the format of any header words under "Trace Header Locations...".
From the "SEGY Dump..." menu, click on "Trace Header Locations...", then under
the "Shot Point Number" parameter, set Start Byte to -> 201, and Format to ->
IBM (32 bit int.). This will be the Inline number. Now under the "CDP Number"
parameter, set Start Byte to -> 221, and Format to -> IBM (32 bit int.). This
will be the Xline number.
Toggle on "Scan tape", specify your tape drive (the dump can also be sent to a
specified file), and dump the tape.
The output will give you:
- the file number
- the record number (records 1 and 2 are the EBCDIC and line headers)
- number of bytes in the record
- SP (Inline for this example)
- CDP (Xline for this example)
A sample of the output from Scan Tape is given below:
--------------------------------------------------------------------------------
File number: 1
Record number: 1 Number of bytes: 3200
Record number: 2 Number of bytes: 400
Record number: 3 Number of bytes: 3744 SP 554.000 CDP 408
Record number: 4 Number of bytes: 3744 SP 554.000 CDP 409
Record number: 5 Number of bytes: 3744 SP 554.000 CDP 410
Record number: 6 Number of bytes: 3744 SP 554.000 CDP 411
Record number: 7 Number of bytes: 3744 SP 554.000 CDP 412
Record number: 8 Number of bytes: 3744 SP 554.000 CDP 413
Record number: 9 Number of bytes: 3744 SP 554.000 CDP 414
Record number: 10 Number of bytes: 3744 SP 554.000 CDP 415
Record number: 11 Number of bytes: 3744 SP 554.000 CDP 416
Record number: 12 Number of bytes: 3744 SP 554.000 CDP 417
Record number: 13 Number of bytes: 3744 SP 554.000 CDP 418
Record number: 14 Number of bytes: 3744 SP 554.000 CDP 419
Record number: 15 Number of bytes: 3744 SP 554.000 CDP 420
Record number: 16 Number of bytes: 3744 SP 554.000 CDP 421
Record number: 17 Number of bytes: 3744 SP 554.000 CDP 422
Record number: 18 Number of bytes: 3744 SP 554.000 CDP 423
Record number: 19 Number of bytes: 3744 SP 554.000 CDP 424
Record number: 20 Number of bytes: 3744 SP 554.000 CDP 425
Record number: 21 Number of bytes: 3744 SP 554.000 CDP 426
Record number: 22 Number of bytes: 3744 SP 554.000 CDP 427
Record number: 23 Number of bytes: 3744 SP 554.000 CDP 428
Record number: 24 Number of bytes: 3744 SP 554.000 CDP 429
Record number: 25 Number of bytes: 3744 SP 554.000 CDP 430
Record number: 26 Number of bytes: 3744 SP 554.000 CDP 431
Record number: 27 Number of bytes: 3744 SP 554.000 CDP 432
Record number: 28 Number of bytes: 3744 SP 555.000 CDP 408
Record number: 29 Number of bytes: 3744 SP 555.000 CDP 409
Record number: 30 Number of bytes: 3744 SP 555.000 CDP 410
Record number: 31 Number of bytes: 3744 SP 555.000 CDP 411
Record number: 32 Number of bytes: 3744 SP 555.000 CDP 412
Record number: 33 Number of bytes: 3744 SP 555.000 CDP 413
Record number: 34 Number of bytes: 3744 SP 555.000 CDP 414
Record number: 35 Number of bytes: 3744 SP 555.000 CDP 415
Record number: 36 Number of bytes: 3744 SP 555.000 CDP 416
Record number: 37 Number of bytes: 3744 SP 555.000 CDP 417
Record number: 38 Number of bytes: 3744 SP 555.000 CDP 418
Record number: 39 Number of bytes: 3744 SP 555.000 CDP 419
Record number: 40 Number of bytes: 3744 SP 555.000 CDP 420
Record number: 41 Number of bytes: 3744 SP 555.000 CDP 421
Record number: 42 Number of bytes: 3744 SP 555.000 CDP 422
Record number: 43 Number of bytes: 3744 SP 555.000 CDP 423
Record number: 44 Number of bytes: 3744 SP 555.000 CDP 424
Record number: 45 Number of bytes: 3744 SP 555.000 CDP 425
Record number: 46 Number of bytes: 3744 SP 555.000 CDP 426
Record number: 47 Number of bytes: 3744 SP 555.000 CDP 427
Record number: 48 Number of bytes: 3744 SP 555.000 CDP 428
Record number: 49 Number of bytes: 3744 SP 555.000 CDP 429
Record number: 50 Number of bytes: 3744 SP 555.000 CDP 430
Record number: 51 Number of bytes: 3744 SP 555.000 CDP 431
Record number: 52 Number of bytes: 3744 SP 555.000 CDP 432
Record number: 53 Number of bytes: 3744 SP 556.000 CDP 408
Record number: 54 Number of bytes: 3744 SP 556.000 CDP 409
Record number: 55 Number of bytes: 3744 SP 556.000 CDP 410
Last Modified on: 13-JUN-00