[geenew]

Does anyone have a quick summary they could offer on how forestry tiles are added?

It's clear that they are added in blocks - edges to forest-cover data are at edges of very large (100km?) tiles.

I wonder, though, where that information comes from. Public sources GIS, and analysis of public satellite imagery, are two possibilities that come to mind.

[solardev]

I am not sure if these are correct/current, but there's a lot of info in the wiki:

https://wiki.openstreetmap.org/wiki/United_States/Public_lan...

https://wiki.openstreetmap.org/wiki/US_Forest_Service_Data

https://wiki.openstreetmap.org/wiki/TIGER