| buffer_circle | A circule function |
| buffer_rectangle | A rectangle Function |
| buffer_semicircle | A Semicircle Function |
| buffer_square | A square Function |
| buffer_wedge | A wedge Function |
| buffer_windrose | A wind-rose shaped buffer function |
| wind_sample | Wind Data of Hong Kong's King's Park meteorological station for 2010 in hourly resolution |