usu.doc

seismic software,very useful

libusu.a:  	TABLE OF CONTENTS	(08/17/92)

1. Dip filtering routines
	a. dpf.f  - 2d dip filtering 
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1. Dip filtering routines

	a. dpf 	- dip filtering routine	

Prototype and parameters:

void dpf_(int nslopes, float smin, float ds, float *amps, float bias,
	int nt, float dt, int nx, float dx, float *data,
        complex *cpfft,	complex *pfft, int ntfft, int nxfft);

Input:
 nslopes       number of slopes where amplitudes specified
 smin          minimum slope
 ds            slope increment
 amps          amplitudes corresponding to smin+(is-1)*ds, is=1,2,..,nslopes
 bias          linear moveout slope before and after filtering
 nt            number of time samples
 dt            time sampling interval
 nx            number of traces
 dx            trace space (spatial sampling interval)
 data          data to be filtered
 cpfft         work array
 pfft          work array 
 ntfft         fft length of t
 nxfft         fft length of x

 Output:
 data          filtered data

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2. 2.5-D phase and frequency compensation routine
	a. f2p5.f - 2.5 D compensation	

void f2p5_(float *trace, int n); 

Input:
 trace		input trace
 n		number of samples per trace
Output:
 trace		output trace with sqrt(-if) applied
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