mirror of https://github.com/ecmwf/eccodes.git
139 lines
3.3 KiB
C
139 lines
3.3 KiB
C
/*
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* Copyright 2005-2017 ECMWF.
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*
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* This software is licensed under the terms of the Apache Licence Version 2.0
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* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
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*
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* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
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* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
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*/
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#include "grib_api.h"
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#include "math.h"
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static void usage(char* prog) {
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printf("usage: %s file1.grib file2.grib\n",prog);
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exit(1);
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}
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int main(int argc, char* argv[]) {
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grib_handle *h1,*h2;
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int ret=0;
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FILE *f1,*f2;
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char* infile1;
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char* infile2;
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double *v1,*v2,*v,*gv;
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double *lon1,*lon2,*lon,*glon;
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double *lat1,*lat2,*lat,*glat;
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size_t size1,size2,size,gsize;
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double err1,err2,err;
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int i,j;
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grib_context* c;
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grib_iterator *iter1,*iter2;
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c=grib_context_get_default();
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if (argc < 3) usage(argv[0]);
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infile1=argv[1];
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infile2=argv[2];
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f1=fopen(infile1,"r");
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if (!f1) {
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perror(infile1);
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exit(1);
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}
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f2=fopen(infile2,"r");
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if (!f2) {
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perror(infile2);
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exit(1);
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}
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while ((h1=grib_handle_new_from_file(0,f1,&ret))!=NULL) {
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if ((h2=grib_handle_new_from_file(c,f2,&ret))==NULL) {
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printf("unable to create handle from file %s\n",infile2);
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GRIB_CHECK(ret,0);
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exit(1);
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}
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GRIB_CHECK(grib_get_size(h1,"values",&size1),0);
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v1=(double*)malloc(size1*sizeof(double));
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if (!v1) {printf("unable to allocate v1\n");exit(1);}
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lat1=(double*)malloc(size1*sizeof(double));
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if (!lat1) {printf("unable to allocate lat1\n");exit(1);}
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lon1=(double*)malloc(size1*sizeof(double));
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if (!lon1) {printf("unable to allocate lon1\n");exit(1);}
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GRIB_CHECK(grib_get_double(h1,"packingError",&err1),0);
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iter1=grib_iterator_new(h1,0,&ret);
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GRIB_CHECK(ret,0);
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GRIB_CHECK(grib_get_size(h2,"values",&size2),0);
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v2=(double*)malloc(size2*sizeof(double));
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if (!v2) {printf("unable to allocate v2\n");exit(1);}
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lat2=(double*)malloc(size2*sizeof(double));
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if (!lat2) {printf("unable to allocate lat2\n");exit(1);}
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lon2=(double*)malloc(size2*sizeof(double));
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if (!lon2) {printf("unable to allocate lon2\n");exit(1);}
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GRIB_CHECK(grib_get_double(h2,"packingError",&err2),0);
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iter2=grib_iterator_new(h2,0,&ret);
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GRIB_CHECK(ret,0);
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lat=lat1; lon=lon1; v=v1;
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while(grib_iterator_next(iter1,lat,lon,v)) {
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lat++;
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if (*lon < 0 ) *lon+=360;
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lon++;
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v++;
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}
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lat=lat2; lon=lon2; v=v2;
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while(grib_iterator_next(iter2,lat,lon,v)) {
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lat++;
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if (*lon < 0 ) *lon+=360;
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lon++;
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v++;
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}
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if (size1 > size2) {
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lat=lat2;lon=lon2;v=v2;
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size=size2;
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glat=lat1;glon=lon1;gv=v1;
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gsize=size1;
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} else {
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lat=lat1;lon=lon1;v=v1;
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size=size1;
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glat=lat2;glon=lon2;gv=v2;
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gsize=size2;
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}
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if (err1>err2) err=err1;
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else err=err2;
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j=0;
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for (i=0;i<size;i++) {
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while (j < gsize && ( lat[i]!=glat[j] || lon[i]!=glon[j] ) ) j++;
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if (j == gsize) {
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j=0;
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while (j < gsize && ( lat[i]!=glat[j] || lon[i]!=glon[j] ) ) j++;
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}
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if (j==gsize) {
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printf("lat=%g lon=%g not found in global\n",lat[i],lon[i]);
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exit(1);
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}
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if (fabs(v[i]-gv[j])>err) {
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ret=1;
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printf("lat=%g lon=%g sub area value=%g global value=%g\n",
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lat[i],lon[i],v[i],gv[j]);
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}
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}
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free(v);free(gv);free(lat);free(glat);free(lon);free(glon);
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}
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fclose(f1);
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fclose(f2);
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return ret;
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}
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