The image is blocked, so I can’t see what you’re talking about.
Have you tried Google’s “search by images” feature? You can upload an image to Google and have it find similar images on the web-- if there’s a higher resolution version of the same image, that should bring it up.
I have not been able to find the exact map you are looking for. However, I have found a very similar map, of the Ping Fan installation where much of the Unit 731 work was performed.
It’s within this rather lengthy .pdf from the U.S. National Archives, Select Documents on Japanese War Crime and Japanese Biological Warfare, 1934-2006, at page 30 in the .pdf viewer. The resolution of this map is also quite poor. I do not know who the author is. I do know it’s within the report, “Biological Warfare: Activities and Capabilities of Foreign Nations", which was drafted between Jan and June of 1946. It’s also titled Japanese War Crimes (JWC) 36. From the Archives itself:
Nevertheless, the last half of the .pdf is a database listing documents relating to Japanese biological warfare and other war crimes and locations within the Archives where you can find more documents like them.
My guess is that if you search for documents relating to Ishii’s interviews with U.S. personnel, you’ll find the exact map you’re looking for.