What is areal interpolation?� To know what it is, we first know about the target zone and source zone.� In the real world, we often run into the lack of necessary data for an area.� Let us define an area that does not have the necessary data as the target zone, and an area that has the data as a source zone.� Areal interpolation is algorithmic methods to acquire estimate values of target zones from known values of source zones.�