static int init(grib_iterator* iter,grib_handle* h,grib_arguments* args)
{
int ret=GRIB_SUCCESS,j;
double lat_first=0,lon_first=0,lat_last=0,lon_last=0,d=0;
double* lats;
size_t plsize=0;
int l=0;
long* pl;
long nj=0,order=0,ilon_first,ilon_last,i;
long row_count=0;
grib_context* c=h->context;
grib_iterator_gaussian_reduced* self = (grib_iterator_gaussian_reduced*)iter;
const char* slat_first = grib_arguments_get_name(h,args,self->carg++);
const char* slon_first = grib_arguments_get_name(h,args,self->carg++);
const char* slat_last = grib_arguments_get_name(h,args,self->carg++);
const char* slon_last = grib_arguments_get_name(h,args,self->carg++);
const char* sorder = grib_arguments_get_name(h,args,self->carg++);
const char* spl = grib_arguments_get_name(h,args,self->carg++);
const char* snj = grib_arguments_get_name(h,args,self->carg++);
if((ret = grib_get_double_internal(h, slat_first,&lat_first)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_double_internal(h, slon_first,&lon_first)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_double_internal(h, slat_last,&lat_last)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_double_internal(h, slon_last,&lon_last)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_long_internal(h, sorder,&order)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_long_internal(h, snj,&nj)) != GRIB_SUCCESS)
return ret;
lats=(double*)grib_context_malloc(h->context,sizeof(double)*order*2);
if((ret = grib_get_gaussian_latitudes(order, lats)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_size(h,spl,&plsize)) != GRIB_SUCCESS)
return ret;
pl=(long*)grib_context_malloc(c,sizeof(long)*plsize);
grib_get_long_array_internal(h,spl,pl, &plsize);
self->las = grib_context_malloc(h->context,iter->nv*sizeof(double));
self->los = grib_context_malloc(h->context,iter->nv*sizeof(double));
while (lon_last<0) lon_last+=360;
while (lon_first<0) lon_first+=360;
d=fabs(lats[0]-lats[1]);
if ( (fabs(lat_first-lats[0]) >= d ) ||
(fabs(lat_last+lats[0]) >= d ) ||
lon_first != 0 ||
fabs(lon_last - (360.0-90.0/order)) > 90.0/order
) {
/*sub area*/
/*find starting latitude */
while (fabs(lat_first-lats[l]) > d ) {l++;}
iter->e=0;
for (j=0;j<plsize;j++) {
row_count=0;
/*printf("lat=%g\n",lats[j+l]);*/
grib_get_reduced_row(pl[j],lon_first,lon_last,
&row_count,&ilon_first,&ilon_last);
if (ilon_first>ilon_last) ilon_first-=pl[j];
for (i=ilon_first;i<=ilon_last;i++) {
self->los[iter->e]=((i)*360.0)/pl[j];
self->las[iter->e]=lats[j+l];
iter->e++;
}
}
} else {
/*global*/
iter->e=0;
for (j=0;j<plsize;j++) {
row_count=pl[j];
for (i=0;i<row_count;i++) {
self->los[iter->e]=(i*360.0)/row_count;
self->las[iter->e]=lats[j];
iter->e++;
}
}
}
iter->e = -1;
grib_context_free(h->context,lats);
grib_context_free(h->context,pl);
return ret;
}
int codes_get_gaussian_latitudes(long truncation,double* latitudes)
{
return grib_get_gaussian_latitudes(truncation,latitudes);
}
static int init(grib_iterator* iter,grib_handle* h,grib_arguments* args)
{
int ret=GRIB_SUCCESS, j, is_global=0;
double lat_first=0,lon_first=0,lat_last=0,lon_last=0;
double angular_precision = 1.0/1000000.0;
double* lats;
size_t plsize=0;
long* pl;
long max_pl=0;
long nj=0,order=0,ilon_first,ilon_last,i;
long row_count=0;
long editionNumber = 0;
grib_context* c=h->context;
grib_iterator_gaussian_reduced* self = (grib_iterator_gaussian_reduced*)iter;
const char* slat_first = grib_arguments_get_name(h,args,self->carg++);
const char* slon_first = grib_arguments_get_name(h,args,self->carg++);
const char* slat_last = grib_arguments_get_name(h,args,self->carg++);
const char* slon_last = grib_arguments_get_name(h,args,self->carg++);
const char* sorder = grib_arguments_get_name(h,args,self->carg++);
const char* spl = grib_arguments_get_name(h,args,self->carg++);
const char* snj = grib_arguments_get_name(h,args,self->carg++);
if((ret = grib_get_double_internal(h, slat_first,&lat_first)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_double_internal(h, slon_first,&lon_first)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_double_internal(h, slat_last,&lat_last)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_double_internal(h, slon_last,&lon_last)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_long_internal(h, sorder,&order)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_long_internal(h, snj,&nj)) != GRIB_SUCCESS)
return ret;
if (grib_get_long(h, "editionNumber", &editionNumber)==GRIB_SUCCESS) {
if (editionNumber == 1) angular_precision = 1.0/1000;
}
lats=(double*)grib_context_malloc(h->context,sizeof(double)*order*2);
if (!lats) return GRIB_OUT_OF_MEMORY;
if((ret = grib_get_gaussian_latitudes(order, lats)) != GRIB_SUCCESS)
return ret;
if((ret = grib_get_size(h,spl,&plsize)) != GRIB_SUCCESS)
return ret;
Assert(plsize);
pl=(long*)grib_context_malloc(c,sizeof(long)*plsize);
if (!pl) return GRIB_OUT_OF_MEMORY;
grib_get_long_array_internal(h,spl,pl, &plsize);
self->las = (double*)grib_context_malloc(h->context,iter->nv*sizeof(double));
if (!self->las) return GRIB_OUT_OF_MEMORY;
self->los = (double*)grib_context_malloc(h->context,iter->nv*sizeof(double));
if (!self->los) return GRIB_OUT_OF_MEMORY;
while (lon_last<0) lon_last+=360;
while (lon_first<0) lon_first+=360;
/* Find the maximum element of "pl" array, do not assume it's 4*N! */
/* This could be an Octahedral Gaussian Grid */
max_pl = pl[0];
for (j=1; j<plsize; j++) {
if (pl[j] > max_pl) max_pl = pl[j];
}
is_global = is_gaussian_global(lat_first, lat_last, lon_first, lon_last, max_pl, lats, angular_precision);
if ( !is_global ) {
int l=0;
/*sub area*/
/*find starting latitude */
const double d = fabs(lats[0] - lats[1]);
while (fabs(lat_first-lats[l]) > d ) {l++;}
iter->e=0;
for (j=0;j<plsize;j++) {
row_count=0;
grib_get_reduced_row(pl[j],lon_first,lon_last,
&row_count,&ilon_first,&ilon_last);
if (ilon_first>ilon_last) ilon_first-=pl[j];
for (i=ilon_first;i<=ilon_last;i++) {
#ifdef DEBUG
Assert(iter->e < iter->nv);
#endif
self->los[iter->e]=((i)*360.0)/pl[j];
self->las[iter->e]=lats[j+l];
iter->e++;
}
}
} else {
/*global*/
iter->e=0;
for (j=0;j<plsize;j++) {
row_count=pl[j];
for (i=0;i<row_count;i++) {
#ifdef DEBUG
Assert(iter->e < iter->nv);
#endif
self->los[iter->e]=(i*360.0)/row_count;
self->las[iter->e]=lats[j];
iter->e++;
}
}
}
iter->e = -1;
grib_context_free(h->context,lats);
grib_context_free(h->context,pl);
return ret;
}
