Create inscribed circlesΒΆ
This notebook creates a center and a radius of a maximum inscribed circle of each enclosed tessellation cell. We will need it to generate distance-based weights used to measure contextual characters.
It requires custom piece of code within pygeos. Therefore, we use a custom docker container based on docker/Dockerfile.
from dask.distributed import Client, LocalCluster, as_completed
from tqdm.notebook import tqdm
from time import time
client = Client(LocalCluster())
client
Client
|
Cluster
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pygeos.constructive.maximum_inscribed_circle is custom function implemented in https://github.com/martinfleis/pygeos/tree/circle branch. It is likely that it will, in some form, be part of the future release of pygeos.
def _circle(chunk):
import geopandas as gpd
import pygeos
gpd._compat.USE_PYGEOS = True
s = time()
df = gpd.read_parquet(f'../../urbangrammar_samba/spatial_signatures/tessellation/tess_{chunk}.pq', columns=['hindex', 'tessellation'])
geoms = df.tessellation.values.data
insc = pygeos.constructive.maximum_inscribed_circle(geoms, 0.1)
lenghts = pygeos.length(insc)
points = pygeos.points(pygeos.get_coordinates(insc)[::2])
res = gpd.GeoDataFrame({'hindex': df.hindex, 'radius': lenghts}, geometry=points, crs=27700, index=df.index)
res.to_parquet(f'../../urbangrammar_samba/spatial_signatures/inscribed_circle/circle_{chunk}.pq')
return f"Chunk {chunk} processed sucessfully in {time() - s} seconds."
%%time
workers=16
inputs = iter(range(103))
futures = [client.submit(_circle, next(inputs)) for i in range(workers)]
ac = as_completed(futures)
for finished_future in ac:
# submit new future
try:
new_future = client.submit(_circle, next(inputs))
ac.add(new_future)
except StopIteration:
pass
print(finished_future.result())
Chunk 11 processed sucessfully in 75.18252611160278 seconds.
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CPU times: user 19.2 s, sys: 2.08 s, total: 21.2 s
Wall time: 11min 48s