bigframes.bigquery.st_isclosed#

bigframes.bigquery.st_isclosed(series: Series | GeoSeries) → Series[source]#

Returns TRUE for a non-empty Geography, where each element in the Geography has an empty boundary.

Note

BigQuerys Geography functions, like st_isclosed, interpret the geometry data type as a point set on the Earths surface. A point set is a set of points, lines, and polygons on the WGS84 reference spheroid, with geodesic edges. See: https://cloud.google.com/bigquery/docs/geospatial-data

Examples:

>>> import bigframes.geopandas
>>> import bigframes.pandas as bpd
>>> import bigframes.bigquery as bbq

>>> from shapely.geometry import Point, LineString, Polygon

>>> series = bigframes.geopandas.GeoSeries(
...     [
...         Point(0, 0),  # Point
...         LineString([(0, 0), (1, 1)]),  # Open LineString
...         LineString([(0, 0), (1, 1), (0, 1), (0, 0)]),  # Closed LineString
...         Polygon([(0, 0), (1, 1), (0, 1), (0, 0)]),
...         None,
...     ]
... )
>>> series
0                                       POINT (0 0)
1                            LINESTRING (0 0, 1 1)
2             LINESTRING (0 0, 1 1, 0 1, 0 0)
3             POLYGON ((0 0, 1 1, 0 1, 0 0))
4                                           None
dtype: geometry

>>> bbq.st_isclosed(series)
0     True
1    False
2     True
3     False
4     <NA>
dtype: boolean

Parameters:

series (bigframes.pandas.Series | bigframes.geopandas.GeoSeries) A series containing geography objects.

Returns:

Series of booleans indicating whether each geometry is closed.

Return type:

bigframes.pandas.Series