.sindex attribute on a GeoDataFrame or GeoSeries
to generate a spatial index if it does not yet exist,
which may take considerable time based on the underlying index
implementation.
Note that the underlying spatial index may not be fully
initialized until the first use.
Currently, sindex is not retained when calling this method from a GeoDataFrame.
You can workaround this by first extracting the active geometry column as a GeoSeries,
and calling this method.
Signature
Returns
bool
True if the spatial index has been generated or
False if not.
