The great historical aerial map service
shanghai-map.net has made the most detailed closeup of its 1948 and 1979 maps unavailable. Attempting the maximum magnification now gives you a blank page. I once had a crazy idea to screenshot the whole 1948 downtown at a maximum zoom but the website appeared stable so I postponed this.
Level 5:
Level 6:
Level 7:
And we no longer have Levels 8 and 9, which used to look like the image below. More images in
this post.