[Question] Applying an image to map terrain

[ZondaX15]

How do you apply an image to the terrain of a map?
I would like to use an image from google earth to show me where to place objects and paint terrain.
I have heard you can do it with Tpaint somehow, but all of the tutorials I have seen do not tell me how to do this.
If it helps, I want to do it to a 1km map.

Edit: Here is the image I want to use

[Reddeath]

https://www.realitymod.com/forum/f189-m ... rmaps.html

dont forget to mirror it in a photo editor if you want north to be north and such.