>>12510150>What I need is basic unmarked landmasses that I can create transparent color blotches for species distributions over.Wait. What exactly are we talking about here?
Do you have a large georeferenced dataset of biomes and species distribution that you need to automatically generate accurate maps for, or do you literally want to crudely draw color blotches on roughly the right area over a world map outline?
If the latter, use photoshop or illustrator (or GIMP or Krita or whatever), get your particular map in the bottom layer, make a new layer, set blend mode to multiply and start drawing.
If the former, you will need to write some sort of import script that depends on the specific format of your dataset and create whatever output style you desire.
