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/*
NASA/TRMM, Code 910.1.
This is the TRMM Office Radar Software Library.
Copyright (C) 1996, 1997
John H. Merritt
Space Applications Corporation
Vienna, Virginia
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/**********************************************************************/
/* By: John Merritt */
/* Space Applications Corporation */
/* June 12, 1994 */
/**********************************************************************/
#include <stdio.h>
#include "rsl.h"
/**********************************************************************/
/* */
/* RSL_fraction_of_ray */
/* RSL_fraction_of_sweep */
/* RSL_fraction_of_volume */
/* */
/* Compute fraction of dBz within a specified range. */
/* Loops are unrolled in each higher function because we are */
/* computing fractiion. I thought about a returning a Ratio */
/* structure, but dismissed it. */
/* */
/**********************************************************************/
typedef struct {
int n;
int ntotal;
} Frac_ratio;
Frac_ratio RSL_ratio_of_ray(Ray *r, float lo, float hi, float range)
{
int i;
int ibin_range; /* Maximum bin include, based on range. */
Frac_ratio fr;
fr.n = fr.ntotal = 0;
if (r == NULL) return fr;
fr.n = 0;
ibin_range = range /( (float)r->h.gate_size / 1000.0 );
if (ibin_range > r->h.nbins) ibin_range = r->h.nbins;
for (i=0; i<ibin_range; i++) {
if (lo <= r->h.f(r->range[i]) && r->h.f(r->range[i]) <= hi) fr.n++;
fr.ntotal++;
}
return fr;
}
float RSL_fraction_of_ray(Ray *r, float lo, float hi, float range)
{
Frac_ratio fr;
fr = RSL_ratio_of_ray(r, lo, hi, range);
return (float)fr.n / (float)fr.ntotal;
}
Frac_ratio RSL_ratio_of_sweep(Sweep *s, float lo, float hi, float range)
{
Frac_ratio total_ratio;
Frac_ratio ray_ratio;
int i;
total_ratio.n = total_ratio.ntotal = 0;
if (s == NULL) return total_ratio;
for (i = 0; i<s->h.nrays; i++) {
ray_ratio = RSL_ratio_of_ray(s->ray[i], lo, hi, range);
total_ratio.n += ray_ratio.n;
total_ratio.ntotal += ray_ratio.ntotal;
}
return total_ratio;
}
float RSL_fraction_of_sweep(Sweep *s, float lo, float hi, float range)
{
Frac_ratio fr;
fr = RSL_ratio_of_sweep(s, lo, hi, range);
return (float)fr.n / (float)fr.ntotal;
}
Frac_ratio RSL_ratio_of_volume(Volume *v, float lo, float hi, float range)
{
Frac_ratio total_ratio;
Frac_ratio sweep_ratio;
int i;
total_ratio.n = total_ratio.ntotal = 0;
if (v == NULL) return total_ratio;
for (i = 0; i<v->h.nsweeps; i++) {
sweep_ratio = RSL_ratio_of_sweep(v->sweep[i], lo, hi, range);
total_ratio.n += sweep_ratio.n;
total_ratio.ntotal += sweep_ratio.ntotal;
}
return total_ratio;
}
float RSL_fraction_of_volume(Volume *v, float lo, float hi, float range)
{
Frac_ratio fr;
fr = RSL_ratio_of_volume(v, lo, hi, range);
return (float)fr.n / (float)fr.ntotal;
}
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