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