Unfortunately manual. I looked into automating at first, but ended up creating this manually by importing GIS data into Adobe Illustrator and then rotating things by hand. The 'break points' where the rotations occur are concealed within existing bends or at bridge crossings
A app or map app layer that flattens the river (or hiking trail, road) into a scrollable ’strip’ in lieu of panning on the screen to get from A to B. 🫡
I looked into that sort of thing quite a bit before I made the first map, but couldn't find anything that worked exactly how I wanted, and I wasn't able to figure out how to do it on my own either. But maybe one day!
Narrow maps are quite cool.. A lot of information on not a lot of paper.. I used to use them often when GPS wasn't a thing and I cycled a lot more: radweit.de/hhh/hhh.html (sorry, German site)