This world map was completed by Takahashi Kageyasu (1785−1829) of Tenmonkata (the office in charge of astronomy). He began the work on the 1807 by order of the shogunate government, with the assistance of astronomer Hazama Shigetomi and Dutch interpreter Baba Sajūrō, who was summoned to Edo (present-day Tokyo) from Nagasaki in 1808. Kageyasu submitted the first version of the map to the government in 1810. The East Asian region was later revised and this version of the map was etched by Aōdō Denzen in 1816. The year of publication is not given on the map, but the date has been confirmed from other sources, including Ranyaku teikō (Navigation to study Dutch) by Ōtsuki Gentaku (completed in 1816). The map utilizes information gained from the Mamiya Straight crossing exploration of 1809, an expedition led by the Japanese explorer Mamiya Rinzō (1775−1844) to survey Karafuto (Sakhalin Island). In this map, what in the West is called the Western hemisphere is placed on the right side and called the Eastern hemisphere. In the four corners are subhemispheric maps, one of which (in the upper left) shows Kyōto at the center. These features make the map a distinctively Japanese creation. The map was originally printed in 16 parts and pasted onto one sheet. This copy, from the National Diet Library, was divided into two sections.