dask_geopandas.GeoSeries.union#
- GeoSeries.union(other, *args, **kwargs)#
Returns a
GeoSeries
of the union of points in each aligned geometry with other.This docstring was copied from geopandas.base.GeoPandasBase.union.
Some inconsistencies with the Dask version may exist.
The operation works on a 1-to-1 row-wise manner:
- Parameters:
- otherGeoseries or geometric object
The Geoseries (elementwise) or geometric object to find the union with.
- alignbool | None (default None) (Not supported in Dask)
If True, automatically aligns GeoSeries based on their indices. If False, the order of elements is preserved. None defaults to True.
- Returns:
- GeoSeries
Examples
>>> from shapely.geometry import Polygon, LineString, Point >>> s = geopandas.GeoSeries( ... [ ... Polygon([(0, 0), (2, 2), (0, 2)]), ... Polygon([(0, 0), (2, 2), (0, 2)]), ... LineString([(0, 0), (2, 2)]), ... LineString([(2, 0), (0, 2)]), ... Point(0, 1), ... ], ... ) >>> s2 = geopandas.GeoSeries( ... [ ... Polygon([(0, 0), (1, 1), (0, 1)]), ... LineString([(1, 0), (1, 3)]), ... LineString([(2, 0), (0, 2)]), ... Point(1, 1), ... Point(0, 1), ... ], ... index=range(1, 6), ... )
>>> s 0 POLYGON ((0 0, 2 2, 0 2, 0 0)) 1 POLYGON ((0 0, 2 2, 0 2, 0 0)) 2 LINESTRING (0 0, 2 2) 3 LINESTRING (2 0, 0 2) 4 POINT (0 1) dtype: geometry >>>
>>> s2 1 POLYGON ((0 0, 1 1, 0 1, 0 0)) 2 LINESTRING (1 0, 1 3) 3 LINESTRING (2 0, 0 2) 4 POINT (1 1) 5 POINT (0 1) dtype: geometry
We can do union of each geometry and a single shapely geometry:
>>> s.union(Polygon([(0, 0), (1, 1), (0, 1)])) 0 POLYGON ((0 0, 0 1, 0 2, 2 2, 1 1, 0 0)) 1 POLYGON ((0 0, 0 1, 0 2, 2 2, 1 1, 0 0)) 2 GEOMETRYCOLLECTION (POLYGON ((0 0, 0 1, 1 1, 0... 3 GEOMETRYCOLLECTION (POLYGON ((0 0, 0 1, 1 1, 0... 4 POLYGON ((0 1, 1 1, 0 0, 0 1)) dtype: geometry
We can also check two GeoSeries against each other, row by row. The GeoSeries above have different indices. We can either align both GeoSeries based on index values and compare elements with the same index using
align=True
or ignore index and compare elements based on their matching order usingalign=False
:>>> s.union(s2, align=True) 0 None 1 POLYGON ((0 0, 0 1, 0 2, 2 2, 1 1, 0 0)) 2 MULTILINESTRING ((0 0, 1 1), (1 1, 2 2), (1 0,... 3 LINESTRING (2 0, 0 2) 4 MULTIPOINT ((0 1), (1 1)) 5 None dtype: geometry
>>> s.union(s2, align=False) 0 POLYGON ((0 0, 0 1, 0 2, 2 2, 1 1, 0 0)) 1 GEOMETRYCOLLECTION (POLYGON ((0 0, 0 2, 1 2, 2... 2 MULTILINESTRING ((0 0, 1 1), (1 1, 2 2), (2 0,... 3 LINESTRING (2 0, 0 2) 4 POINT (0 1) dtype: geometry