In this research project, we verified the types of Japanese paper, coloring material, needle holes at the surveying point, and description contents of Tadataka Inoh’s cartography and survey maps of Japan, using high-definition image data and non-destructive inspection methods.
As a result, it was found that various types of Japanese paper were used in the maps presented to Daimyos (i.e., feudal lords), the copies of the submitted maps, and the draft maps, and that coloring pigment was frequently used in the presented maps to symbolize directions (i.e., the compass rose). In addition, the results of the analysis of the needle holes revealed the differences in survey precision during the survey period, the relationship between the draft maps and presented maps, and the advanced technique used for making Inoh’s maps.
