My first job out of high school was doing GIS mapping for the National Wetlands Survey with a stereo scope, high altitude infrared, and topo overlays. I was comparing old data to new observations and manually drawing the identified bodies of water onto mylar over the topo. After that, I’d write the labels and lines on a second mylar overlay.

All of this was then given to a digital mapping team that plotted everything a using specialized mouse. That was 25 years ago, give or take.

The GIS software was so insanely expensive back then. To see something of this caliber for free is impressive.