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ECC-886: Converting lambert_azimuthal_equal_area (Experimental)

This commit is contained in:
Shahram Najm 2019-03-26 13:24:40 +00:00
parent 0479c91ba9 487ae774ac
commit 2d6b08d9e0
2 changed files with 43 additions and 10 deletions
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4
definitions/grib2/template.3.140.def
View File

@ -13,10 +13,12 @@ include "grib2/template.3.shape_of_the_earth.def";
# Nx - number of points along X-axis
unsigned[4] numberOfPointsAlongXAxis : dump ;
alias Nx = numberOfPointsAlongXAxis;
alias Ni = Nx;
# Ny - number of points along Y-axis
unsigned[4] numberOfPointsAlongYAxis : dump ;
alias Ny = numberOfPointsAlongYAxis;
alias Nj = Ny;
# La1 - latitude of first grid point
signed[4] latitudeOfFirstGridPoint: edition_specific ;
@ -69,3 +71,5 @@ meta latLonValues latlonvalues(values);
alias latitudeLongitudeValues=latLonValues;
meta latitudes latitudes(values,0);
meta longitudes longitudes(values,0);
meta distinctLatitudes latitudes(values,1);
meta distinctLongitudes longitudes(values,1);

41
tools/grib_to_netcdf.c
View File

@ -2185,12 +2185,29 @@ static int check_grid(field *f)
if (strcmp(grid_type, "regular_ll") != 0 && (strcmp(grid_type, "regular_gg") != 0))
{
if(strcmp(grid_type,"lambert_azimuthal_equal_area")==0) {
fprintf(stderr, "grib_to_netcdf: WARNING: Support for gridType of lambert_azimuthal_equal_area is currently experimental.\n");
} else {
grib_context_log(ctx, GRIB_LOG_ERROR, "Grid type = %s", grid_type);
grib_context_log(ctx, GRIB_LOG_ERROR, "First GRIB is not on a regular lat/lon grid or on a regular Gaussian grid. Exiting.\n");
return GRIB_GEOCALCULUS_PROBLEM;
}
}
return e;
}
static int grid_is_lambert_azimuthal(grib_handle* h)
{
char grid_type[80];
size_t size = sizeof(grid_type);
if (grib_get_string(h, "typeOfGrid", grid_type, &size) == GRIB_SUCCESS &&
strcmp(grid_type, "lambert_azimuthal_equal_area")==0)
{
return 1;
}
return 0;
}
static int get_num_latitudes_longitudes(grib_handle* h, size_t* nlats, size_t* nlons)
{
err e=0;
@ -2198,9 +2215,9 @@ static int get_num_latitudes_longitudes(grib_handle* h, size_t* nlats, size_t* n
size_t size = sizeof(grid_type);
if (grib_get_string(h, "typeOfGrid", grid_type, &size) == GRIB_SUCCESS &&
strcmp(grid_type, "regular_ll") == 0)
(strcmp(grid_type, "regular_ll")==0 || strcmp(grid_type, "lambert_azimuthal_equal_area")==0))
{
/* Special shortcut for regular lat/on grids */
/* Special shortcut for regular lat/on and lambert azimuthal grids */
long n;
Assert( !grib_is_missing(h, "Ni", &e) );
if ((e = grib_get_long(h, "Ni", &n)) != GRIB_SUCCESS) {
@ -2308,11 +2325,23 @@ static int put_latlon(int ncid, fieldset *fs)
}
#endif
if((e = get_num_latitudes_longitudes(g->handle, &nj, &ni)) != GRIB_SUCCESS) {
if (grid_is_lambert_azimuthal(g->handle)) {
/* ECC-886: For Lambert we need the actual number of distinct lat/lons which will be higher than Ni/Nj */
if((e = grib_get_size(g->handle, "distinctLatitudes", &nj)) != GRIB_SUCCESS) {
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: cannot get distinctLatitudes: %s", grib_get_error_message(e));
return e;
}
if((e = grib_get_size(g->handle, "distinctLongitudes", &ni)) != GRIB_SUCCESS) {
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: cannot get distinctLongitudes: %s", grib_get_error_message(e));
return e;
}
}
else {
if((e = get_num_latitudes_longitudes(g->handle, &nj, &ni)) != GRIB_SUCCESS) {
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: put_latlon: cannot get distinctLatitudes: %s", grib_get_error_message(e));
return e;
}
}
/* Compute max. # values and allocate */
nv = ni;
@ -2328,7 +2357,7 @@ static int put_latlon(int ncid, fieldset *fs)
check_err(stat, __LINE__, __FILE__);
if((e = grib_get_double_array(g->handle, "distinctLongitudes", dvalues, &n)) != GRIB_SUCCESS)
{
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: cannot get distinctLongitudes: %s", grib_get_error_message(e));
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: put_latlon: cannot get distinctLongitudes: %s", grib_get_error_message(e));
return e;
}
Assert(n == ni);
@ -2344,7 +2373,7 @@ static int put_latlon(int ncid, fieldset *fs)
check_err(stat, __LINE__, __FILE__);
if((e = grib_get_double_array(g->handle, "distinctLatitudes", dvalues, &n)) != GRIB_SUCCESS)
{
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: cannot get distinctLatitudes: %s", grib_get_error_message(e));
grib_context_log(ctx, GRIB_LOG_ERROR, "ecCodes: put_latlon: cannot get distinctLatitudes: %s", grib_get_error_message(e));
return e;
}