It is technically possible to use the API to modify existing chunk data in a save. However, to date nobody has written a plugin or tool to do so.
A lot can be done through the creative tools in-game. It wouldn't be too hard to re-create the terrain and textures if you had a good source of the irl area, and a way of measuring it. I have thought of doing a build of, say, Africa! Building the landform, and then creating the landmarks ( pyramids, Nile, Sahara, Congo ) On a obviously blown-up scale. (in comparison with the size of the land ofc)
I agree it can be done in creative mode (or even not) but I've tried it in Minecraft and it's a ton of work just to get to the bare bones of what I'm trying to accomplish. My kids introduced me to Minecraft when it first came out, and I immediately saw it as a tool. I'm a novelist and have used Minecraft for years to sketch settings for my books. Not being an architect, or an sketch artist, it's easier to imagine and describe a small town or special building--especially for action scenes--if I can visually 'walk' through the set.
But now I need to design a fictional city and country based on a real life location, including an entire battle. But it's sci fi, so all the details have to be accurate for the audience. It would be so much faster if I could just upload what already exists from topo maps.
If Rising World figured out how to pull this off, it's no longer a game to me. It's an essential writing tool. And I'll bet the sci fi and fantasy creators will come running. (If they're not here already.) 
~Kesselia
I think what you need is a Holodeck! 
If only...
Yes! A holodeck! With a Stargate! And lightsabers! And while we're at it, have Thor report to my ready room. 
Don’t have an account yet? Create a new account now and be part of our community!
