mirror of https://github.com/ecmwf/eccodes.git
97 lines
2.9 KiB
C
97 lines
2.9 KiB
C
/*
|
|
* C Implementation: get_set
|
|
*
|
|
* Description:
|
|
|
|
*
|
|
* Author: Enrico Fucile <enrico.fucile@ecmwf.int>, (C) 2006
|
|
*
|
|
* Copyright: See COPYING file that comes with this distribution
|
|
*
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "grib_api.h"
|
|
|
|
int main(int argc, char** argv) {
|
|
int err = 0;
|
|
double *values = NULL;
|
|
size_t values_len= 0;
|
|
|
|
size_t i = 0;
|
|
|
|
double latitudeOfFirstGridPointInDegrees;
|
|
double longitudeOfFirstGridPointInDegrees;
|
|
double latitudeOfLastGridPointInDegrees;
|
|
double longitudeOfLastGridPointInDegrees;
|
|
|
|
double jDirectionIncrementInDegrees;
|
|
double iDirectionIncrementInDegrees;
|
|
|
|
long numberOfPointsAlongAParallel;
|
|
long numberOfPointsAlongAMeridian;
|
|
|
|
double average = 0;
|
|
|
|
FILE* in = NULL;
|
|
char* filename = "../data/sample1.grib";
|
|
grib_handle *h = NULL;
|
|
|
|
in = fopen(filename,"r");
|
|
if(!in) {
|
|
printf("ERROR: unable to open file %s\n",filename);
|
|
return 1;
|
|
}
|
|
|
|
h = grib_handle_new_from_file(0,in,&err);
|
|
if (h == NULL) {
|
|
printf("Error: unable to create handle from file %s\n",filename);
|
|
}
|
|
|
|
GRIB_CHECK(grib_get_long(h,"numberOfPointsAlongAParallel",&numberOfPointsAlongAParallel),0);
|
|
printf("numberOfPointsAlongAParallel=%ld\n",numberOfPointsAlongAParallel);
|
|
|
|
GRIB_CHECK(grib_get_long(h,"numberOfPointsAlongAMeridian",&numberOfPointsAlongAMeridian),0);
|
|
printf("numberOfPointsAlongAMeridian=%ld\n",numberOfPointsAlongAMeridian);
|
|
|
|
GRIB_CHECK(grib_get_double(h,"latitudeOfFirstGridPointInDegrees",&latitudeOfFirstGridPointInDegrees),0);
|
|
printf("latitudeOfFirstGridPointInDegrees=%g\n",latitudeOfFirstGridPointInDegrees);
|
|
|
|
GRIB_CHECK(grib_get_double(h,"longitudeOfFirstGridPointInDegrees",&longitudeOfFirstGridPointInDegrees),0);
|
|
printf("longitudeOfFirstGridPointInDegrees=%g\n",longitudeOfFirstGridPointInDegrees);
|
|
|
|
GRIB_CHECK(grib_get_double(h,"latitudeOfLastGridPointInDegrees",&latitudeOfLastGridPointInDegrees),0);
|
|
printf("latitudeOfLastGridPointInDegrees=%g\n",latitudeOfLastGridPointInDegrees);
|
|
|
|
GRIB_CHECK(grib_get_double(h,"longitudeOfLastGridPointInDegrees",&longitudeOfLastGridPointInDegrees),0);
|
|
printf("longitudeOfLastGridPointInDegrees=%g\n",longitudeOfLastGridPointInDegrees);
|
|
|
|
GRIB_CHECK(grib_get_double(h,"jDirectionIncrementInDegrees",&jDirectionIncrementInDegrees),0);
|
|
printf("jDirectionIncrementInDegrees=%g\n",jDirectionIncrementInDegrees);
|
|
|
|
GRIB_CHECK(grib_get_double(h,"iDirectionIncrementInDegrees",&iDirectionIncrementInDegrees),0);
|
|
printf("iDirectionIncrementInDegrees=%g\n",iDirectionIncrementInDegrees);
|
|
|
|
GRIB_CHECK(grib_get_size(h,"values",&values_len),0);
|
|
|
|
values = malloc(values_len*sizeof(double));
|
|
|
|
GRIB_CHECK(grib_get_double_array(h,"values",values,&values_len),0);
|
|
|
|
average = 0;
|
|
for(i = 0; i < values_len; i++)
|
|
average += values[i];
|
|
|
|
average /=(double)values_len;
|
|
|
|
free(values);
|
|
|
|
printf("There are %d values, average is %g\n",(int)values_len,average);
|
|
|
|
grib_handle_delete(h);
|
|
|
|
fclose(in);
|
|
return 0;
|
|
}
|