Hi,
In the SU format, the bytes you use for inline and cross line numbers
are allocated to SU use (see sukeyword -o ; d2 and f2 are floats in SU).
Bytes # 189-192 and # 193-196 are inline/crossline numbers in segy rev1
for 3D post stack data. SU is not 3D fully capable and segywrite does
not use them for segy rev0 output.
I tried this simple test.
suplane | sushw key=d2,f2 a=3,4 | segyhdrs | segywrite tape=plane.segy
segyread tape=plane.segy | surange
tracl 1 32 (1 - 32)
tracr 1 32 (1 - 32)
offset 400
ns 64
dt 4000
d2 0.000000
f2 0.000000
:-(
I don't see any solution at the user level without modifying segywrite
to introduce header remapping à la segyread.
Within SU, I suggest that you use other keywords to store the inline and
cross line numbers (such as swdep/gwdep, 4 bytes integers) and apply
header remapping to read the
data in other software. Anyway, using bytes # 189-196 in SU will
complicate data display.
suplane | sushw key=swdep,gwdep a=3,4 | segyhdrs | segywrite
tape=plane.segy
segyread tape=plane.segy | surange
tracl 1 32 (1 - 32)
tracr 1 32 (1 - 32)
offset 400
swdep 3
gwdep 4
ns 64
dt 4000
D.
Le 20/10/2022 à 01:35, tanahashi.m(a)gmail.com a écrit :
Dear all,
I have performed a time resample of some 500ns sampled 3D seismic data
to 1ms intervals using the suresamp command as shown below, but was
unable to transcribe the 189-192 bytes of the Inline and the 192-196
bytes of the crossline numbers.
segyread tape=Source3D.sgy|suresamp rf=0.5|segyhdrs|segywrite
tape=Output3D_1ms.sgy
I solved this problem by using the ASCII input/output function for
trace header on SeiSee, a free Windows software, to write out the
header information of the original file and then write it into the
header of the output file.
Is there a way to transcribe inline and crossline numbers using the SU
function?
Manabu Tanahashi
Tsukuba, Japan
_______________________________________________
Seisunix mailing list --seisunix(a)mailman.seismic-unix.org
To unsubscribe send an email toseisunix-leave(a)mailman.seismic-unix.org
--
|Dominique Rousset LFCR UMR5150 / E2S UPPA / Dpt des géosciences|
|Univ. Pau et des Pays de l'Adour BP 1155 F-64013 Pau Cedex - France|
|mailto:dominique.rousset@univ-pau.fr
http://lfc.univ-pau.fr|
| Off: +33 559 407 423 Cell: +33 660 861 391 |