1 files changed, 70 insertions, 0 deletions
diff --git a/src/libcf/cf_screen_airglow.c b/src/libcf/cf_screen_airglow.c
new file mode 100644
index 0000000..5a7b2b3
--- /dev/null
+++ b/src/libcf/cf_screen_airglow.c
@@ -0,0 +1,70 @@
+/*****************************************************************************
+ *              Johns Hopkins University
+ *              Center For Astrophysical Sciences
+ *              FUSE
+ *****************************************************************************
+ *
+ * Synopsis:    cf_screen_airglow (fitsfile *header, long nevents,
+ *			      float *x, float *y, unsigned char *location)
+ *
+ * Description: Flag photon events in airglow regions.
+ *
+ * Arguments:   fitsfile  *header	Input FITS file pointer
+ *              long      nevents	Number of photon events
+ *              float     *x		X coordinate array
+ *              float     *y		Y coordinate array
+ *              unsigned char *location Photon location flag array
+ *
+ * Calls:	cf_get_geocorona
+ *
+ * Returns:	0 on success
+ *
+ * History:	03/10/05   1.1   wvd    Initial coding
+ *
+ ****************************************************************************/
+
+#include <stdlib.h>
+#include "calfuse.h"
+
+int
+cf_screen_airglow (fitsfile *header, long nevents, float *x, float *y,
+	unsigned char *location)
+{
+    char CF_PRGM_ID[] = "cf_screen_airglow";
+    char CF_VER_NUM[] = "1.1";
+
+    int   errflg=0, ngeo;
+    long  i, j;
+    short *gxmin, *gxmax, *gymin, *gymax;
+
+    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(header, CF_PRGM_ID))) return errflg;
+
+    /*
+     *  Read limits of airglow regions from AIRG_CAL file.
+     */
+    ngeo = cf_get_geocorona(header, &gxmin, &gxmax, &gymin, &gymax);
+
+    /*
+     *  Set the airglow bit of photons in the airglow regions.
+     */
+    for (i = 0; i < nevents; i++) {
+	for (j=0; j<ngeo; j++) {
+            if (x[i] > gxmin[j] && x[i] < gxmax[j] &&
+		y[i] > gymin[j] && y[i] < gymax[j] ) {
+		location[i] = location[i] | LOCATION_AIR;
+		break;
+	    }
+        }
+    }
+
+    free(gxmin);
+    free(gxmax);
+    free(gymin);
+    free(gymax);
+
+    cf_proc_update(header, CF_PRGM_ID, "COMPLETE");
+    cf_timestamp(CF_PRGM_ID, CF_VER_NUM, "Done processing");
+    return 0;
+}