sustack.su.main

su 的源代码库

 SUSTACK - stack adjacent traces having the same key header word

     sustack <stdin >stdout [Optional parameters]		

 Required parameters:						
 	none							

 Optional parameters: 						
 	key=cdp		header key word to stack on		
 	normpow=1.0	each sample is divided by the		
			normpow'th number of non-zero values	
			stacked (normpow=0 selects no division)	
	repeat=0	=1 repeats the stack trace nrepeat times
	nrepeat=10	repeats stack trace nrepeat times in	
	          	output file				
 	verbose=0	verbose = 1 echos information		

 Notes:							
 ------							
 The offset field is set to zero on the output traces, unless	
 the user is stacking with key=offset. In that case, the value 
 of the offset field is left unchanged. 		        

 Sushw can be used afterwards if this is not acceptable.	

 For VSP users:						
 The stack trace appears ten times in the output file when	
 setting repeat=1 and nrepeat=10. Corridor stacking can be	
 achieved by properly muting the upgoing data with SUMUTE	
 before stacking.						


 Credits:
	SEP: Einar Kjartansson
	CWP: Jack K. Cohen, Dave Hale
	CENPET: Werner M. Heigl - added repeat trace functionality

 Note:
	The "valxxx" subroutines are in su/lib/valpkge.c.  In particular,
      "valcmp" shares the annoying attribute of "strcmp" that
		if (valcmp(type, val, valnew) {
			...
		}
	will be performed when val and valnew are different.

 Trace header fields accessed: ns
 Trace header fields modified: nhs, tracl, offset