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/*****************************************************************************
* Johns Hopkins University
* Center For Astrophysical Sciences
* FUSE
*****************************************************************************
*
* Synopsis: cf_screen_limb_angle(fitsfile *infits, long nseconds,
* unsigned char *timeline_status,
* float *timeline_limb);
*
* Description: Set the screening bit due to limb angle constraint.
*
* Arguments: fitsfile *infits Input FITS file pointer
* long nseconds Number of points in the timeline table
* unsigned char *timeline_status The status flag array
* float *timeline_limb The limb angle distance array
*
* Calls:
*
* Returns: 0 on success
*
* History: 10/21/02 1.1 jch Initial coding
* 12/20/02 1.3 jch Make sure the flags are unsigned char
* 05/20/03 1.4 rdr Added call to cf_proc_check
* 09/10/03 1.5 wvd Move test of LIMB_SCR to cf_fuv_init.
* 07/21/04 1.7 wvd Delete unused variable limb_cor.
* 02/17/05 1.8 wvd Place parentheses around assignment
* used as truth value.
* 03/30/05 1.9 wvd Write BRITLIMB and DARKLIMB keywords
* to IDF file header.
*
****************************************************************************/
#include <string.h>
#include <stdio.h>
#include "calfuse.h"
int
cf_screen_limb_angle(fitsfile *infits, long nseconds,
unsigned char *timeline_status, float *timeline_limb)
{
char CF_PRGM_ID[] = "cf_screen_limb_angle";
char CF_VER_NUM[] = "1.9";
int errflg=0, status=0;
long i;
char file_name[FLEN_VALUE];
double angle, britlimb, darklimb;
fitsfile *scrnfits;
cf_error_init(CF_PRGM_ID, CF_VER_NUM, stderr);
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Begin Processing");
if ((errflg = cf_proc_check(infits, CF_PRGM_ID))) return errflg;
/*
* Open the screening parameters file and read the parameters.
*/
FITS_read_key(infits, TSTRING, "SCRN_CAL", file_name, NULL, &status);
FITS_open_file(&scrnfits, cf_parm_file(file_name), READONLY, &status);
FITS_read_key(scrnfits, TDOUBLE, "BRITLIMB", &britlimb, NULL, &status);
FITS_read_key(scrnfits, TDOUBLE, "DARKLIMB", &darklimb, NULL, &status);
/*
* Write BRITLIMB and DARKLIMB keywords to IDF file header.
*/
FITS_update_key(infits, TDOUBLE, "BRITLIMB", &britlimb, NULL, &status);
FITS_update_key(infits, TDOUBLE, "DARKLIMB", &darklimb, NULL, &status);
/*
* If the limb angle is less than the limit, set the limb-angle bit.
* Use day or night limit as appropriate.
*/
for (i = 0; i < nseconds; i++) {
angle = darklimb;
if ((timeline_status[i] & TEMPORAL_DAY) == TEMPORAL_DAY) {
angle = britlimb;
}
if (timeline_limb[i] < angle) {
timeline_status[i] |= TEMPORAL_LIMB;
}
}
FITS_close_file(scrnfits, &status);
cf_proc_update(infits, CF_PRGM_ID, "COMPLETE");
cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done processing");
return status;
}
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