1998 年 63 巻 512 号 p. 167-173
As Basins are geographically closed, they have often been treated as planning sphere. This study aims to qantify the degree of the dependency of basins uslng "Gaibuizondo", which is defined by population, commuting population, size of basin, and the amount of habitants' income, and to apply "Gaibuizondo" to the method of setting planning spheres. The study revealed that the degree of "Gaibuizondo" are fixed and peculiar to each basin, appling "Gaibuizondo" to the method of setting planning spheres was validated.