pythonmergegeopandasintersect

how do geopandas sjoin predicate 'within' and 'intersects' differ

I'm identifying if a point locates within a polygon. I have a dataframe contains the points and another dataframe contains the polygons, so I want to spatial join them like:

gpd.sjoin(df_points, df_polygons, how = 'left')

I know the default is predicate=intersects, but how do intersects and within differ? Which one should I use for my purpose?

Thanks

Solution

  • The PostGIS Tutorial has some very good graphics that explain the different Spatial Joins.

    Intersects

    Within