suchw

seismic software,very useful

SUCHW - change header word using one or two header word fields
suchw <stdin >stdout [optional parameters]
Required parameters:
	none
Optional parameters:
	key1=cdp	output key
	key2=cdp	input key
	key3=cdp	input key
	a=0		overall shift
	b=1		scale on first input key
	c=0		scale on second input key
	d=1		overall scale
The value of header word key1 is computed from the values of
key2 and key3 by:
	val(key1) = (a + b * val(key2) + c * val(key3)) / d
Examples:
Shift cdp numbers by -1:
	suchw <data >outdata a=-1
Add 1000 to tracr value:
 	suchw key1=tracr key2=tracr a=1000 <infile >outfile
We set the receiver point (gx) field by summing the offset
and shot point (sx) fields and then we set the cdp field by
averaging the sx and gx fields (we choose to use the actual
locations for the cdp fields instead of the conventional
1, 2, 3, ... enumeration):
	suchw <indata key1=gx key2=offset key3=sx b=1 c=1 |
	suchw key1=cdp key2=gx key3=sx b=1 c=1 d=2 >outdata