[OpendTect_Users] Users Digest, Vol 65, Issue 10

[Gery Herbozo Jimenez]

> > Hi all,
> >
> > I wanted to make a 3D cube using a 2D line set of GPR data but I have  
> > read in past messages that we can't do this with OpendTect... Do  
> > someone know how I can do ?
> >
> > Regards,
> > Morgane

Hi Morgane,

I was looking for almost the same some time ago, but only I just wanted to create a pseudo cube. I received great support from Mr Duncan Irving and Mr Walter Wheeler, also Bert sent me some ideas about this issue. Glenn Reynolds, a very clever dude, sent me this:

================
Gery
You can't CAT SEGY files, as they each have a character and reel header. You only need the first one.
In
 SU, it is easy. Make sure you have the same number of samples and 
traces on each 2D line. Then CAT them to a single file. You need them in
 the right order, obviously. Say you have inlines 1001 to 2000, in files
 seis1001.su to seis2000.su. In a Bash shell, you could use:

for((i=1001;i<2001;i++))do  echo Adding seis$i.su  cat seis$i.sudone >big.su

For SEGY, just run the output through SEGYWRITE, ie change the last line to:done | segywrite >big.segy
You need to make sure you have the right endianness, and a character and binary header. See SEGYWRITE for an explanation.

If you are starting with SEGY files, then use SEGYREAD to put them in SU format first.
Ho ho ho
- glenn
================

This email was sent during the Xsmas time [that's why the "Ho ho ho" at the end, ie. this was a very good Xstmas gift ;)]. This can be done in Seismic Unix, I've never seen a gpr file but I think it is the same principle.

Hope this helps.
 		 	   		  
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