sumigsplit.su.main

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 SUMIGSPLIT - Split-step depth migration for zero-offset data.         

 sumigsplit <infile >outfile vfile= [optional parameters]              

 Required Parameters:                                                  
 nz=                   number of depth sapmles                         
 dz=                   depth sampling interval                         
 vfile=                name of file containing velocities              

 Optional Parameters:                                                  
 dt=from header(dt) or .004    time sampling interval                  
 dx=from header(d2) or 1.0     midpoint sampling interval              
 ft=0.0                        first time sample                       
 fz=                           first depth sample                      

 tmpdir=        if non-empty, use the value as a directory path        
                prefix for storing temporary files; else if the        
                the CWP_TMPDIR environment variable is set use         
                its value for the path; else use tmpfile()             


 Notes:                                                                
 The input velocity file \'vfile\' consists of C-style binary floats.  
 The structure of this file is vfile[iz][ix]. Note that this means that
 the x-direction is the fastest direction instead of z-direction! Such a
 structure is more convenient for the downward continuation type       
 migration algorithm than using z as fastest dimension as in other SU  
 programs.                                                     	

 Because most of the tools in the SU package (such as  unif2, unisam2, 
 and makevel) produce output with the structure vfile[ix][iz], you will
 need to transpose the velocity files created by these programs. You may
 use the SU program \'transp\' in SU to transpose such files into the  
 required vfile[iz][ix] structure.                                     

  

 Credits: CWP Baoniu Han, July 21th, 1997

 Reference:
  Stoffa, P. L. and Fokkema, J. T. and Freire, R. M. and Kessinger, W. P.,
  1990, Split-step Fourier migration, Geophysics, 55, 410-421.


 Trace header fields accessed: ns, dt, delrt, d2
 Trace header fields modified: ns, dt, delrt