I roughly know how world maps were created, but detailed local maps of towns and forest's are something I find interesting. What methods were used to scale down in world, to paper distances?

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[–] 4 points 4 months ago

The map overlay on that website is stunning. I don't know much French, but I managed to get it to overlay the IGN map (I presume the currently accepted map from the government mapping agency) on the Cassini map, both at 50% opacity, and it's truly remarkable how good the latter must have been in its time.

There's so much detail along the coast that was faithfully recorded. The only thing I can spot that is noticeably different would be the river runs, but that's entirely expected since rivers naturally move around.

I'd love to know if there's a USA website that overlays colonial-era maps atop the modern USGS maps.

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