Nice, and congrats! Could you show an example of original image and ASCII output, as I’m afk atm.

Lemmy (pun intended) answer my own question here: Yes, it’s relative hight along the river’s centerline: https://opentopography.org/blog/new-package-automates-river-relative-elevation-model-rem-generation

Please tell me more about “Relative Elevation Model”. Are those elevations in the river’s surroundings relative to the river’s water surface height? Or something else?

Non paywalled link: https://12ft.io/proxy?q=https%3A%2F%2Fwww.ftm.eu%2Farticles%2Fashton-kutchers-non-profit-start-up-makes-millions-from-fighting-child-abuse-online

How do you connect i/o devices to it?