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/*
* Copyright 2005-2016 ECMWF.
*
* This software is licensed under the terms of the Apache Licence Version 2.0
* which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
*
* In applying this licence, ECMWF does not waive the privileges and immunities granted to it by
* virtue of its status as an intergovernmental organisation nor does it submit to any jurisdiction.
*/
/**************************************
* Enrico Fucile
**************************************/
#include "grib_api_internal.h"
#include <math.h>
/*
This is used by make_class.pl
START_CLASS_DEF
CLASS = iterator
SUPER = grib_iterator_class_gen
IMPLEMENTS = destroy
IMPLEMENTS = init;next
MEMBERS = double *las
MEMBERS = double *los
MEMBERS = long nam
END_CLASS_DEF
*/
/* START_CLASS_IMP */
/*
Don't edit anything between START_CLASS_IMP and END_CLASS_IMP
Instead edit values between START_CLASS_DEF and END_CLASS_DEF
or edit "iterator.class" and rerun ./make_class.pl
*/
static void init_class (grib_iterator_class*);
static int init (grib_iterator* i,grib_handle*,grib_arguments*);
static int next (grib_iterator* i, double *lat, double *lon, double *val);
static int destroy (grib_iterator* i);
typedef struct grib_iterator_gaussian_reduced{
grib_iterator it;
/* Members defined in gen */
long carg;
const char* missingValue;
/* Members defined in gaussian_reduced */
double *las;
double *los;
long nam;
} grib_iterator_gaussian_reduced;
extern grib_iterator_class* grib_iterator_class_gen;
static grib_iterator_class _grib_iterator_class_gaussian_reduced = {
&grib_iterator_class_gen, /* super */
"gaussian_reduced", /* name */
sizeof(grib_iterator_gaussian_reduced),/* size of instance */
0, /* inited */
&init_class, /* init_class */
&init, /* constructor */
&destroy, /* destructor */
&next, /* Next Value */
0, /* Previous Value */
0, /* Reset the counter */
0, /* has next values */
};
grib_iterator_class* grib_iterator_class_gaussian_reduced = &_grib_iterator_class_gaussian_reduced;
static void init_class(grib_iterator_class* c)
{
c->previous = (*(c->super))->previous;
c->reset = (*(c->super))->reset;
c->has_next = (*(c->super))->has_next;
}
/* END_CLASS_IMP */
static int next(grib_iterator* i, double *lat, double *lon, double *val)
{
grib_iterator_gaussian_reduced* self = (grib_iterator_gaussian_reduced*)i;
if((long)i->e >= (long)(i->nv-1))
return 0;
i->e++;
*lat = self->las[i->e];
*lon = self->los[i->e];
*val = i->data[i->e];
return 1;
}
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(0);
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;
}
static int destroy(grib_iterator* i)
{
grib_iterator_gaussian_reduced* self = (grib_iterator_gaussian_reduced*)i;
const grib_context *c = i->h->context;
grib_context_free(c,self->las);
grib_context_free(c,self->los);
return 1;
}
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