What we need is something like this: http://www.cartographersguild.com/attachments/how-do-i/44778d1336904592-need-help-earth-obliquie-projection-srtm_ramp2.world.5400x2700.jpg
The higher the land, the more white, the higher the land is. I'm not really sure on how much effect the snow has, but I don't know the world's mountain ranges' heights well enough for that.
Anyway: Topographical maps or territory maps are fairly useless. A simple land/water map will only get you a simple land/water map in the editor (as flat as possible).
The downside of the map I linked to is that you also have no proper view of the height underwater (which you do have in WD)