l0cnst_read_modis.c

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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <PGS_TD.h>
 
#define buffsize_mb 0.5
#define primary_hdr_size 6
 
int main(int argc, char *argv[]) {
    int tptr;
 
    //static int pkt_len_off = 4;
    //static int time_cnt = 8;
    //static int day_pkt_size = 642;
    //static int night_pkt_size = 276;
    static unsigned char start_time_tag[8];
    static unsigned char stop_time_tag[8];
 
    double taitime_start;
    double taitime_stop;
 
    unsigned char inbuf[384];
    FILE *stream;
 
    printf("read_constructor_file: Version as of 06/18/04\n\n");
 
    stream = fopen(argv[1], "r");
    if (stream == NULL) {
        printf("%s not found.\n", argv[1]);
        exit(-1);
    }
    fseek(stream, (long) 0, SEEK_SET);
 
 
    fread(inbuf, sizeof (char), 384, stream);
 
    tptr = 64 + 16 * inbuf[51];
    memcpy(start_time_tag, &inbuf[tptr], 8);
    memcpy(stop_time_tag, &inbuf[tptr + 8], 8);
 
    fclose(stream);
 
    PGS_TD_EOSAMtoTAI(start_time_tag, &taitime_start);
    PGS_TD_EOSAMtoTAI(stop_time_tag, &taitime_stop);
    printf("starttimeTAI=%f\n", taitime_start);
    printf("stoptimeTAI =%f\n", taitime_stop);
 
    PGS_TD_TAItoUTC(taitime_start, (char*) inbuf);
    printf("starttime=%s\n", inbuf);
    PGS_TD_TAItoUTC(taitime_stop, (char*) inbuf);
    printf("stoptime =%s\n", inbuf);
 
    printf("granule length =%f\n", (taitime_stop - taitime_start) / 60.0);
 
 
    return 0;
}