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From: Reginald Beardsley on 4 Jan 2007 12:35
abbad(a)ntnu.no wrote:
> Hi guys,
>
> I have a problem to read a SEG-Y file (a file format used in
> geophysics to store and process seismic data). The SEG-Y format
> consists of three blocks separated by an IBG (InterBlock Gap). The
> first block is written in EBCDIC on 3200 bytes and is followed after an
> IBG by a 400-byte binary block. After a third IBG, there is another
> binary block.
>
> My questions are:
>
> 1) How to convert the EBCDIC code to real (through binary if necessary)
> ? I found that the ascii character from 0 to 20 corresponding to the
> EBCDIC code don't exist in Windows and correspond to "blanck spaces".
> 2) How to jump the IGB gap when reading such a file?.
> 3) I wrote subroutines for binary to integer/real conversion and
> vice-versa. are there any simple functions to do that for the special
> formats of binary code (complement to "1" or not, on 4 or 8 bytes for
> instance).
> 4) Do these functions depend on a specific Fortran compiler. If yes,
> which one, running under windows, offers the best environement to
> process EBCDIC and binary codes?.
>
> thanks in advance and hope I get information from your past
> experience with Fortran90.
>

The lazy approach would be to call the C language SEG-Y routines from
CWP/SU

http://www.cwp.mines.edu/cwpcodes/index.html

rhb
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