Hi, good... but not yet very good !

I suspect a problem of numerical accuracy with such high values of X and Y coordinates.

You can test this hypothesis by subtracting the mean of X and Y coordinates to have 0 centered data...

If it's true, it should be better to correct the algorithm, I know...

D.

Le 07/04/2023 à 08:41, JUAN LORENZO DIAZ NAVEAS a écrit :

Dear Glenn and Dominique,

Thanks a lot for your help. Indeed the keyword scalco=-10000 was guilty for scaling sx,sy,gx and gy coordinates. So now I am able to produce an su file with cdp headers.

But now unfortunately I found another problem. The su file with cdp headers has about 66% of cdp=0. The cdp=0 traces are at the "beginning" of the su file.

And the intriguing aspect is that I have a crooked line with 10 points. See the attached map. There the black dots are the source coordinates, the red dots are the receiver coordinates and the green circles are the points of the crooked line.

As you can guess I smoothed both the source and receiver coordinates using the GMT trend1d command.

The command line for my binning looks like this:

*sucdpbin xline=723193.2,744776.011111,766358.822222,787941.633333,809524.444444,831107.255556,852690.066667,874272.877778,895855.688889,920934 \  yline=7242472.4,7242099.3532,7241693.29184,7241254.1793,7240782.11164,7240277.08676,7239739.07882,7239168.07407,7238564.07513,7237820 \          < SO104-17_geom.su verbose=2 dcdp=25 cdpmin=1 distmax=100 > SO104-17_geom-cmp.su

See  below the ranges of the file SO104-17_geom-cmp.su and the attached log file with the verbosity of the sucdpbin command.

I tried also with distmax less than 100m, the smallest value being 15m, but the result was similar.

Any idea on what is going on?

Best wishes

Juan Díaz Naveas

Juan Diaz Naveas (Dr. rer. nat.) Escuela de Ciencias del Mar www.cienciasdelmar.pucv.cl http://www.cienciasdelmar.pucv.cl Pontificia Universidad Catolica de Valparaiso  Tel.: +56-32-2274269 Avenida Universidad 330, Curauma              Cel.: +56-9-91630936 Valparaiso, CHILE    E-Mail: juan.diaz@pucv.cl

---

*466560 traces: tracl    1 513204 (1 - 513204) tracr    1 513204 (1 - 513204) fldr     1 3888 (1 - 3888) tracf    1 120 (1 - 120) ep       1 3888 (1 - 3888) cdp      0 2572 (0 - 14) trid     1 nhs      1 offset   413 3388 (3388 - 413) scalel   -10000 scalco   1 sx       723302 917547 (917547 - 723302) sy       7237924 7242471 (7237924 - 7242471) gx       723715 920934 (920934 - 723715) gy       7237823 7242464 (7237823 - 7242464) counit   1 ns       3585 dt       4000 gain     9 afilf    102 afils    209 lcf      3 hcf      102 lcs      6 hcs      209 year     1995

Shot coordinate limits: North(723302,7.24247e+06) South(917547,7.23792e+06) East(917547,7.23792e+06) West(723302,7.24247e+06)

Receiver coordinate limits: North(723740,7.24246e+06) South(920934,7.23782e+06) East(920934,7.23782e+06) West(723715,7.24246e+06)

Midpoint coordinate limits: North(723521,7.24247e+06) South(919240,7.23787e+06) East(919240,7.23787e+06) West(723508,7.24247e+06)*

El jue, 6 abr 2023 a las 3:10, Dominique ROUSSET (dominique.rousset@univ-pau.fr) escribió:

Hi Juan,

after a quick look at sucdpbin.c, i note that this tools honors
the scalco keyword. So, since your data bear a -10000 scalco, you
have to divide xline and yline parameters by 10000 to work with
actual units, not with sx and sy units.

Let me know it it works
Good luck !

D.

Le 06/04/2023 à 02:47, JUAN LORENZO DIAZ NAVEAS a écrit :

...

Dear SU users,

I am trying to make the CMP binning of a seismic line (see the
headers ranges below).

The command line is:

*sucdpbin < so104-17_geom.su <http://so104-17_geom.su>
xline=723715,920883 yline=7242464,7237825 verbose=2 dcdp=25
distmax=500 > so104-17_cdp.su <http://so104-17_cdp.su>*

As you see I have used a distmax of 500m and still I am not able
to get the binning.

Just in case I also tried again the same command, but sorting the
date so that the first traces in the su file correspond to the
minimum x coordinate and the last traces to the maximum 
coordinate (in the field the line was shot from east to west),
but it failed as well.

Any help would be very much appreciated.

Best wishes

Juan

*466560 traces:
tracl    1 513204 (1 - 513204)
tracr    1 513204 (1 - 513204)
fldr     1 3888 (1 - 3888)
tracf    1 120 (1 - 120)
ep       1 3888 (1 - 3888)
trid     1
nhs      1
offset   413 3388 (3388 - 413)
scalel   -10000
scalco   -10000
sx       723302 917547 (917547 - 723302)
sy       7237924 7242471 (7237924 - 7242471)
gx       723715 920934 (920934 - 723715)
gy       7237823 7242464 (7237823 - 7242464)
counit   1
ns       3585
dt       4000
gain     9
afilf    102
afils    209
lcf      3
hcf      102
lcs      6
hcs      209
year     1995

Shot coordinate limits:
North(-91.7547,-723.792) South(-72.3302,-724.247)
East(-72.3302,-724.247) West(-91.7547,-723.792)

Receiver coordinate limits:
North(-92.0934,-723.782) South(-72.374,-724.246)
East(-72.3715,-724.246) West(-92.0934,-723.782)

Midpoint coordinate limits:
North(-91.924,-723.787) South(-72.3521,-724.247)
East(-72.3509,-724.247) West(-91.924,-723.787)*
-------------------------------------------------------------------
Juan Diaz Naveas (Dr. rer. nat.)
Escuela de Ciencias del Mar www.cienciasdelmar.pucv.cl
<http://www.cienciasdelmar.pucv.cl>
Pontificia Universidad Catolica de Valparaiso  Tel.: +56-32-2274269
Avenida Universidad 330, Curauma  Cel.: +56-9-91630936
Valparaiso, CHILE          E-Mail: juan.diaz@pucv.cl
-------------------------------------------------------------------

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-- 
|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  <mailto:dominique.rousset@univ-pau.fr>                http://lfc.univ-pau.fr|
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