The Sanko Library owns the manuscript maps named “Inoh Tadataka Jissoku-Genzu”，which were drawn for the first surveyed map of Japan by Inoh Tadataka (1745-1818). “Inoh Tadataka Jissoku-Genzu” is based on 30 sheets of the “Shitazu”, the manuscript maps. The scales of “Inoh Tadataka Jissoku-Genzu” are classified into medium (1:216000) and small (1:432000), which correspond to the scales of Inoh’s Map of Japan. On the “Inoh Tadataka Jissoku-Genzu” the results of Inoh’s survey are plotted by needle points.
The General Library of the University of Tokyo owns the manuscript maps named “Sokuchi-Genzu”. Those are same type maps as the Sanko Library owns. The “Sokuchi-Genzu” and “Inoh Tadataka Jissoku-Genzu” are very important materials for the research of Inoh’s Map.
