" I hate about the USGS maps is they have all these green areas that were one person's interpretation of something at one time, but I never find them to be accurate or useful."
ohh .. piffle. hate is punchy stuff, save it something more .... worthy.
but ok yeah, that green is kinda nebulous, but it DID mean something to somebody, and ya, it's a different somebody as the years went by. i like the way form one map to the next, it changes wildly.
but on the other hand, what the heck, its' FREE information. and you should do something with it, once you index the meaning of it and apply that smarts to the rest of the map. first though, one needs to decipher what manner of brush the fellow was thinking about.
granted, it is a bit more useful once you leave the trail networks and are punching brush.
remember than some usgs maps are based on ANCIENT information, gleened from aerial photos taken from like, DC-3's. it goes back quite a ways. alaska has maps not updated since originally birthed in 1953.
check out google earth. then try to use a print of the satellite photos. they are syntheticly colored, so whatever color it is means ???? you got to go there, figure out/index the "what that color means" and apply the knowledge.
it IS helpful (can be virtually, a lifesaver), but only after one knows how to interpret the data.
digital maps of canada are cheapestly avail from yellowmaps.com
canada, not to be sisseys about logging, uses a map emblem "NCB". which means, non-commercial-brush, just so you know where their head's are at.