def test_get_voronoi_latlon():
"""
LatlonGridRemap.get_voronoi(): nlat=180, nlon=360 (regular)
"""
from cube_remap import LatlonGridRemap
from util.convert_coord.cart_ll import latlon2xyz
nlat, nlon = 180, 360
ll = LatlonGridRemap(nlat, nlon, "regular")
ret = ll.get_voronoi(1)
expect = [
(-1.5707963267948966, 0),
(-1.5447610285607269, 0.026179938779914945),
(-1.5447610285607269, 0.008726646259971647),
]
expect_xyz = [latlon2xyz(*latlon) for latlon in expect]
aa_equal(expect_xyz, ret, 10)
ret = ll.get_voronoi(nlon)
expect = [
(-1.5447610285607269, -0.00872664625997164),
(-1.5447610285607269, 0.008726646259971647),
(-1.5274041630712807, 0.008726646259971647),
(-1.5274041630712807, -0.00872664625997164),
]
expect_xyz = [latlon2xyz(*latlon) for latlon in expect]
aa_equal(expect_xyz, ret, 10)
def make_remap_matrix(self, debug=False):
dst_obj = self.dst_obj
src_obj = self.src_obj
dsw_dict = dict() # {dst:[(s,w),(s,w),...],...}
if debug: ipoly_dict = dict() # {dst:[(src,ipoly,iarea),...],..}
for dst, (lat0,lon0) in enumerate(dst_obj.latlons):
dst_poly = dst_obj.get_voronoi(dst)
dst_area = area_polygon(dst_poly)
inout = pt_in_polygon(dst_poly, latlon2xyz(lat0,lon0))
if inout != 'in':
print('dst',dst)
print('latlon_in_poly?', inout)
idx1, idx2, idx3, idx4 = src_obj.get_surround_idxs(lat0, lon0)
candidates = set([idx1, idx2, idx3, idx4])
if -1 in candidates: candidates.remove(-1)
checked_srcs = set()
dsw_dict[dst] = list()
while len(candidates) > 0:
#print('\t', checked_srcs)
src = candidates.pop()
src_poly = src_obj.get_voronoi(src)
ipoly = intersect_two_polygons(dst_poly, src_poly)
checked_srcs.add(src)
if ipoly != None:
iarea = area_polygon(ipoly)
area_ratio = iarea/dst_area
if area_ratio > 1e-10:
dsw_dict[dst].append( (src, area_ratio) )
nbrs = set(src_obj.get_neighbors(src))
candidates.update(nbrs - checked_srcs)
if debug: ipoly_dict[dst].append( (src,ipoly,iarea) )
if debug: self.save_netcdf_ipoly(ipoly_dict)
return self.make_remap_matrix_from_dsw_dict(dsw_dict)
def get_voronoi(self, idx):
return [latlon2xyz(np.deg2rad(lat),np.deg2rad(lon)) for lat,lon in self.voronoi_latlons[idx]]