Aerial photos covering all the 23 Wards of Tokyo before World War II are now available for the first time in GSI Maps

2017-04-28: On April 28, aerial photographs of all the 23 Wards of Tokyo in and around 1936 were released online.
On GSI Maps, the web map operated by GSI, users can overlay and view these photographs on other content including aerial photos of various ages.
Press Release in Japanese