What do you mean by Aerial Differentiation❓❓❓

Areal differentiation represents one of the classic philosophical approaches to geographic inquiry. A central concept of areal differentiation is that the surface of the earth may be divided into regions, which may be distinguished and categorised using various spatial criteria. Thus, areal differentiation provides the theoretical foundation for regional geography, by conceptualising space as consisting of identifiable units that may be distinguished from one another on the basis of a set of phenomena or criteria. When there is similarity and dissimilarity among the physical and cultural features on the earth surface, it is called aerial differentiation.