The First Law of Geography, according to Waldo Tobler, is "everything is related to everything else, but near things are more related than distant things."[1] This first law is the foundation of the fundamental concepts of spatial dependence and spatial autocorrelation and is utilized specifically for the inverse distance weighting method for spatial interpolation and to support the regionalized variable theory for kriging.[2] The first law of geography is the fundamental assumption used in all spatial analysis.[3]