Waldo Tobler (1970) "Everything is related to everything else, but near things are more
related than distant things”. “สงทิ่ อยี่ ใกล ู่ ก้ นจะม ั ความเหม ี อนก ื นมากกว ั าส่ งทิ่ อยี่ ในระยะห ู่ างออกไป ่ ”
Therefor, data close together in space are likely to be correlated (related)
From the First Law of Geography it would then follow that as distance between points
increases, the similarity (i.e., covariance or correlation) between the values at these
points decreases