Now that I can think clearly, I believe what I am looking for is a way to load different layers, masks, etc. for each type of terrain and/or vegetation; so that each has it's own unique color and texture scheme. I understand the base "land" or terrain mask/channel idea, but what if I want to break that base layer into separate regions, like a beach on one side of the island, a grove of trees on the other and a range of hills in between? Technically they are all on the same base layer, but can I cut out the separate pieces and use them