I believe the photo is reoriented South-upwards. The part of the city in the very centre, between two branches of the river, is now Die Museumsinsel. My office should be just outside the northern (bottom) walls.
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Yes, I vaguely remember when I was making it that I was completely failing to work out the scale and alignment until I realised it was upside down! I don't know if it was a German convention to have south top-oriented. (I also don't remember the date of the overlay map...)
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Still can't forget visiting the Wall Museum near Checkpoint Charlie, 22 years ago.
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That's the more famous wall, though! The one on my map is an earlier city wall...
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I also cleaned up my hard disk today, and found lecture notes with elaborate TikZ illustrations me and some fellow students created back when I still had a lot of free time at my hand

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We're talking two decades since I last felt like I had free time... :(
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