Hello , I am wondering about the copyrights on maps.

Lets say someone makes a new map of Game of thrones, his style, his work , but all is diectly taken from other original maps like sizes, position of cities and so on ... Whats like the copyright there?
Can the author even sell those maps as prints without telling anything to the original author? Is not copyright infringment?
I see a lot of sold maps of Game of thrones, Middle Earth and other fictional worlds ....
How does the copyright works here?