Spatial_joins,Merg, and Visualization using choropleths

This straightforward exercise demonstrates the application of spatial join operation for determining the district where each bike station is situated:

1. How to use the spatial join operation (geopandas.sjoin())
2. how to use the merge operation, pd.merge()
3. how to Map of tree density by district
4. how to visualize the tree density by district map using the choropleths equal interval and quantile classification scheme