I think I can solve the "odd" scale of the map for you. Since this is an "Outdoor Survival Hexmap", it is based on the Avalon Hill board game Outdoor Survival (which was a piece of equipment needed/strongly recommended) when playing the Original edition of D & D. The map in that board game is 22" x 24". I don't think this is an exact reproduction (in terms of what is in the hexes, it is hard to tell from the samples provided), but rather a map in that style and for the same purpose.