world builder
I own and love World Builder, and I think Bob is right on — you can do what
you want in 3DS without WB.
WB is really a tool to create views of landscape from a ground view — i.e. any
scenery you can see out a window, or standing in the meadow. It can create
almost any type of landscape you want in that situation — even something that
looks like early dinosaur-type earth — but from space you are really so far
away it doesn't make much sense to use WB (it DOES allow you to render from
above, but that's kind of like spending the time to draw the Mona Lisa on the
wall of a room you'll only see from the outside in).