def get_voronoi(self, uid):
rlat, rlon = self.latlons[uid]
nbrs = [gid for gid in self.nbrs[uid] if gid != -1]
latlon_nbrs = [self.latlons[self.uids[gid]] for gid in nbrs]
x0, y0 = latlon2xyp(rlat,rlon,rlat,rlon)[1]
xy_nbrs = [latlon2xyp(lat,lon,rlat,rlon)[1] for lat,lon in latlon_nbrs]
#------------------------------------------
# Generate a Voronoi diagram
vor = Voronoi([(x0,y0)]+xy_nbrs)
#------------------------------------------
# Remove non-neighbor points
ridge_pts = [sorted(pair) for pair in vor.ridge_points]
xy_nbrs2 = [xy_nbrs[i] for i in xrange(len(nbrs)) \
if [0,i+1] in ridge_pts]
if len(xy_nbrs2) < len(nbrs):
vor = Voronoi([(x0,y0)]+xy_nbrs2)
#for nbr, xy in zip(nbrs, xy_nbrs2):
# print nbr, self.gq_indices[nbr], xy
#------------------------------------------
# Sort the vertices
ridge_pts = [sorted(pair) for pair in vor.ridge_points]
vidxs = list()
for inb in xrange(1,len(xy_nbrs2)+1):
seq = ridge_pts.index([0,inb])
v1, v2 = vor.ridge_vertices[seq]
if inb == 1:
vidxs.append([v1,v2])
elif inb == 2:
vidx0 = np.intersect1d(vidxs[0], [v1,v2])[0]
vidx1 = v1 if vidx0 == v2 else v2
vidxs[0] = vidx0
vidxs.append(vidx1)
else:
vidx = v1 if vidxs[-1] == v2 else v2
vidxs.append(vidx)
xy_vertices = vor.vertices[vidxs]
return xy_vertices, vor
def make_dsw_dict_ll2cs(self):
cs_obj = self.cs_obj
ll_obj = self.ll_obj
dsw_dict = dict() # {dst:[(s,w),(s,w),...],...}
for dst, (rlat,rlon) in enumerate(cs_obj.latlons):
#print dst
dst_xy_vertices, vor_obj = cs_obj.get_voronoi(dst)
dst_poly = Polygon(dst_xy_vertices)
idx1, idx2, idx3, idx4 = ll_obj.get_surround_idxs(rlat, rlon)
candidates = set([idx1, idx2, idx3, idx4])
if -1 in candidates: candidates.remove(-1)
used_srcs = set()
dsw_dict[dst] = list()
while len(candidates) > 0:
#print '\t', used_srcs
src = candidates.pop()
ll_vertices = ll_obj.get_voronoi(src)
src_xy_vertices = [latlon2xyp(lat,lon,rlat,rlon)[1] \
for lat,lon in ll_vertices]
src_poly = Polygon(src_xy_vertices)
ipoly = dst_poly.intersection(src_poly)
area_ratio = ipoly.area/dst_poly.area
if area_ratio > 1e-10:
dsw_dict[dst].append( (src, area_ratio) )
used_srcs.add(src)
nbrs = set(ll_obj.get_neighbors(src))
candidates.update(nbrs - used_srcs)
return dsw_dict
def make_dsw_dict_ll2cs_mpi(self):
from mpi4py import MPI
comm = MPI.COMM_WORLD
nproc = comm.Get_size()
myrank = comm.Get_rank()
cs_obj = self.cs_obj
ll_obj = self.ll_obj
chunk_size = cs_obj.up_size//nproc//10
dsw_dict = dict() # {dst:[(s,w),(s,w),...],...}
if myrank == 0:
start = 0
while start < cs_obj.up_size:
rank = comm.recv(source=MPI.ANY_SOURCE, tag=0)
comm.send(start, dest=rank, tag=10)
start += chunk_size
for i in xrange(nproc-1):
rank = comm.recv(source=MPI.ANY_SOURCE, tag=0)
comm.send('quit', dest=rank, tag=10)
slave_dsw_dict = comm.recv(source=rank, tag=20)
dsw_dict.update(slave_dsw_dict)
return dsw_dict
else:
while True:
comm.send(myrank, dest=0, tag=0)
msg = comm.recv(source=0, tag=10)
if msg == 'quit':
print 'Slave rank %d quit.'%(myrank)
comm.send(dsw_dict, dest=0, tag=20)
return dsw_dict
start = msg
end = start + chunk_size
end = cs_obj.up_size if end > cs_obj.up_size else end
print 'rank %d: %d ~ %d'%(myrank, start, end)
for dst in xrange(start,end):
rlat, rlon = cs_obj.latlons[dst]
dst_xy_vertices, vor_obj = cs_obj.get_voronoi(dst)
dst_poly = Polygon(dst_xy_vertices)
idx1, idx2, idx3, idx4 = ll_obj.get_surround_idxs(rlat, rlon)
candidates = set([idx1, idx2, idx3, idx4])
if -1 in candidates: candidates.remove(-1)
used_srcs = set()
dsw_dict[dst] = list()
while len(candidates) > 0:
src = candidates.pop()
ll_vertices = ll_obj.get_voronoi(src)
src_xy_vertices = [latlon2xyp(lat,lon,rlat,rlon)[1] \
for lat,lon in ll_vertices]
src_poly = Polygon(src_xy_vertices)
ipoly = dst_poly.intersection(src_poly)
area_ratio = ipoly.area/dst_poly.area
if area_ratio > 1e-10:
dsw_dict[dst].append( (src, area_ratio) )
used_srcs.add(src)
nbrs = set(ll_obj.get_neighbors(src))
candidates.update(nbrs - used_srcs)
