MAPPING THE CORRESPONDENCE OF ISARITHMIC MAPS.

Consider two isarithmic maps of continuous actual or abstract phenomena in the same area. Research into the character of the relationship may be pursued in various ways depending upon the interests of the investigator and the level of generalization he hopes to obtain. This paper treats some of the cartographic problems inherent in such an investigation and presents the results of an inquiry into the relation between two statistical surfaces in the Great Plains area. If a correlation analysis were undertaken employing data derived from these two maps the resulting index of simple correlation would reveal that the two distributions are in general highly correlated positively, which is not a surprising fact.