SUPOFILT - POlarization FILTer for three-component data               

 supofilt <stdin >stdout [optional parameters]                         

 Required parameters:                                                  
    dfile=polar.dir   file containing the 3 components of the          
                      direction of polarization                        
    wfile=polar.rl    file name of weighting polarization parameter    

 Optional parameters:                                                  
    dt=(from header)  time sampling intervall in seconds               
    smooth=1          1 = smooth filter operators, 0 do not            
    sl=0.05           smoothing window length in seconds               
    wpow=1.0          raise weighting function to power wpow           
    dpow=1.0          raise directivity functions to power dpow        
    verbose=0         1 = echo additional information                  


 Notes:                                                                
    Three adjacent traces are considered as one three-component        
    dataset.                                                           

    This program SUPOFILT is an extension to the polarization analysis 
    program supolar. The files wfile and dfile are SU files as written 
    by SUPOLAR.                                                        


 
 Author: Nils Maercklin, 
         GeoForschungsZentrum (GFZ) Potsdam, Germany, 1999-2000.
         E-mail: nils@gfz-potsdam.de
 

 References:
    Benhama, A., Cliet, C. and Dubesset, M., 1986: Study and
       Application of spatial directional filtering in three 
       component recordings.
       Geophysical Prospecting, vol. 36.
    Kanasewich, E. R., 1981: Time Sequence Analysis in Geophysics, 
       The University of Alberta Press.
    Kanasewich, E. R., 1990: Seismic Noise Attenuation, 
       Handbook of Geophysical Exploration, Pergamon Press, Oxford.
 

 Trace header fields accessed: ns, dt