Yes I guess 'biome' is not the right word when talking about an exoplanet with no life =p 'Region' also does not fit. I am sure there is a word that describes drasticly different areas of a planet that could potentially host different types of life. Anyway I do not mind how the information is visualised as long as it is pretty friendly. The debug map looks like a radar topographic map that has been colour coded. Kind after they have altered the map to make it easier to interpret for public consumption and non specialised scientists. Some nice images of Venus here. It includes a few different types of image. http://cseligman.com/text/planets/venus.htm.