Feature Request - PNG/bitmap import into scenario editor / map generation

PNG import into scenario editor - being able to import a DEM (digital elevation model) or equivalent file format to "build" the land instead of having to craft it. DEM's are used all over the place for landscape modelling. Alternatively, you could have a simple grayscale bitmap import depicting height. Then we could have scenarios where the map represents a real town, a country, a continent, the world or even the Mons crater on Mars.