def grib_find_nearest(gribid,inlat,inlon,is_lsm = False,npoints = 1):
"""
@brief Find the nearest grid point or the nearest four grid points to a given latitude/longitude.
The number of nearest points returned can be controled through the npoints function argument.
\b Examples: \ref nearest.py "nearest.py"
@param gribid id of the grib loaded in memory
@param inlat latitude of the point
@param inlon longitude of the point
@param is_lsm True if the nearest land point is required otherwise False.
@param npoints 1 or 4 nearest grid points
@return (npoints*(outlat,outlon,value,dist,index))
@exception GribInternalError
"""
if npoints == 1:
err,outlat,outlon,value,dist,idx = _internal.grib_c_find_nearest_single(gribid,is_lsm,inlat,inlon)
GRIB_CHECK(err)
return (Bunch(lat = outlat,lon = outlon,value = value,distance = dist,index = idx),)
elif npoints == 4:
poutlat = _internal.new_doubleArray(4)
poutlon = _internal.new_doubleArray(4)
pvalues = _internal.new_doubleArray(4)
pdist = _internal.new_doubleArray(4)
pidx = _internal.new_intArray(4)
GRIB_CHECK(_internal.grib_c_find_nearest_four_single(gribid,is_lsm,inlat,inlon,poutlat,poutlon,pvalues,pdist,pidx))
result = []
for i in range(4):
result.append(Bunch( \
lat = _internal.doubleArray_getitem(poutlat,i), \
lon = _internal.doubleArray_getitem(poutlon,i), \
value = _internal.doubleArray_getitem(pvalues,i), \
distance = _internal.doubleArray_getitem(pdist,i), \
index = _internal.intArray_getitem(pidx,i), \
))
_internal.delete_doubleArray(poutlat)
_internal.delete_doubleArray(poutlon)
_internal.delete_doubleArray(pvalues)
_internal.delete_doubleArray(pdist)
_internal.delete_intArray(pidx)
return tuple(result)
else:
raise ValueError("Invalid value for npoints. Expecting 1 or 4.")
def grib_get_double_elements(gribid,key,indexes):
"""
@brief Get as double array the elements of the "key" array whose indexes are listed in the input array.
@param gribid id of the grib loaded in memory
@param key the key to be searched
@param indexes list or tuple of indexes
@return numpy.ndarray or array
@exception GribInternalError
"""
if with_numpy():
nidx = len(indexes)
err,result = _internal.grib_get_double_ndelements(gribid,key,indexes,nidx)
GRIB_CHECK(err)
return result
else:
nidx = len(indexes)
pidx = _internal.new_intArray(nidx)
pval = _internal.new_doubleArray(nidx)
psize = _internal.intp()
psize.assign(nidx)
for i in range(len(indexes)):
_internal.intArray_setitem(pidx,i,indexes[i])
err = _internal.grib_c_get_real8_elements(gribid,key,pidx,pval,psize)
GRIB_CHECK(err)
result = array("d")
for i in range(psize.value()):
result.append(_internal.doubleArray_getitem(pval,i))
_internal.delete_intArray(pidx)
_internal.delete_doubleArray(pval)
_internal.delete_intp(psize)
return result
