Abstract
The dot-method mapping is one of the most eminent ways for realizing the geographical facts on a sheet of paper But there is one question in this method that dots concentrate into one part of a map and these doffs adhere to each other, thus forming form one dark spot in this part of the map. Hereupon the author deviced a method to solve this problem, “the method of aeroview.”
Fig. 1 is the sectional base map, A seen from 2, 000m. height, the B from 4, 000m., and each section denotes 1. km2. These diagrams were made by computing each visual angle from the visual points of 2, 000m. and 4, 000m. heights respectively. The sectional distortion of A or B may be utilized according to the degrees of verandering the distances among dots.
The authhr tried to make a population map of Nagoya for an example of this method (Fig. 5). In the m_??_rgin of this map the dots are expressed smaller than the onet in jts centre. By this way, lie thinks he could avoid. the adherence of the dots, and at the same time could induce an obserber to command a bird's-eye view.
In sum, the two merits are seen on thin method; the one is an ability of larger and more clear presentation, the other is that of more vivid expre-ssion of geographical facts.
