def setup(self):
# create irregular polygons by merging overlapping point buffers
self.left = shapely.union_all(
shapely.buffer(shapely.points(np.random.random((500, 2)) * 500),
15))
# shift this up and right
self.right = shapely.transform(self.left, lambda x: x + 50)
def unary_union(self, geoms):
"""Returns the union of a sequence of geometries
This method replaces :meth:`cascaded_union` as the
preferred method for dissolving many polygons.
"""
return shapely.union_all(geoms, axis=None)
def setup(self):
# create irregular polygons by merging overlapping point buffers
self.polygon = shapely.union_all(
shapely.buffer(shapely.points(np.random.random((1000, 2)) * 500),
10))
xmin = np.random.random(100) * 100
xmax = xmin + 100
ymin = np.random.random(100) * 100
ymax = ymin + 100
self.bounds = np.array([xmin, ymin, xmax, ymax]).T
self.boxes = shapely.box(xmin, ymin, xmax, ymax)
def cascaded_union(self, geoms):
"""Returns the union of a sequence of geometries
This function is deprecated, as it was superseded by
:meth:`unary_union`.
"""
warn(
"The 'cascaded_union()' function is deprecated. "
"Use 'unary_union()' instead.",
ShapelyDeprecationWarning,
stacklevel=2,
)
return shapely.union_all(geoms, axis=None)
def setup(self):
# create irregular polygons my merging overlapping point buffers
self.polygons = shapely.get_parts(
shapely.union_all(
shapely.buffer(
shapely.points(np.random.random((2000, 2)) * 500), 5)))
self.tree = shapely.STRtree(self.polygons)
# initialize the tree by making a tiny query first
self.tree.query(shapely.points(0, 0))
# create points that extend beyond the domain of the above polygons to ensure
# some don't overlap
self.points = shapely.points((np.random.random((2000, 2)) * 750) - 125)
self.point_tree = shapely.STRtree(
shapely.points(np.random.random((2000, 2)) * 750))
self.point_tree.query(shapely.points(0, 0))
# create points on a grid for testing equidistant nearest neighbors
# creates 2025 points
grid_coords = np.mgrid[:45, :45].T.reshape(-1, 2)
self.grid_point_tree = shapely.STRtree(shapely.points(grid_coords))
self.grid_points = shapely.points(grid_coords + 0.5)
def time_union_all_prec2(self):
shapely.union_all([self.left, self.right], grid_size=2)
def time_union_all(self):
shapely.union_all([self.left, self.right])
def test_union_all_prec(geom, grid_size, expected):
actual = shapely.union_all(geom, grid_size=grid_size)
assert shapely.equals(actual, expected)