70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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#include "image_sio.h"
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#include "lib_functions.h"
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/*
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int is_big_endian_(void);
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int is_big_endian__(void);
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void die (char *, char *);
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void cross3_(double *, double *, double *);
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void get_seconds(struct PRM, double *, double *);
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*/
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/*---------------------------------------------------------------*/
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/* check endian of machine */
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/* 1 if big; -1 if little */
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int is_big_endian_()
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{
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union
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{
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long l;
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char c[sizeof (long) ];
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} u;
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u.l = 1;
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return( u.c[sizeof(long) - 1] == 1 ? 1 : -1);
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}
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int is_big_endian__()
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{
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return is_big_endian_();
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}
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/*---------------------------------------------------------------*/
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/*---------------------------------------------------------------*/
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/* write out error message and exit */
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/* use two strings to allow more complicated error messages */
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void die (char *s1, char *s2)
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{
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fprintf(stderr," %s %s \n",s1,s2);
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exit(1);
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}
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/*---------------------------------------------------------------*/
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/************************************************************************
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* cross3 is a routine to take the cross product of 3-D vectors *
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*************************************************************************/
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void cross3_(double *a, double *b, double *c)
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/* input and output vectors having 3 elements */
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{
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c[0] = (a[1]*b[2]) - (a[2]*b[1]);
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c[1] = (-a[0]*b[2]) + (a[2]*b[0]);
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c[2] = (a[0]*b[1]) - (a[1]*b[0]);
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}
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/*---------------------------------------------------------------*/
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/*---------------------------------------------------------------------------*/
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/* find seconds */
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void get_seconds(struct PRM p, double *start, double *end)
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{
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int m;
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double dyear, doy;
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double n_secs_day;
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n_secs_day = 24.0*60.0*60.0;
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dyear = 1000.0*floor(p.SC_clock_start/1000.0);
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doy = p.SC_clock_start - dyear;
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m = p.nrows - p.num_valid_az;
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*start = n_secs_day*doy + (1.0*m)/(2.0*p.prf);
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*end = *start + p.num_patches * p.num_valid_az/p.prf;
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}
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/*---------------------------------------------------------------------------*/
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