I can take a land of 67km² (8192x8192 with 1 meter per pixel) and scale to 4096x4096 (2 meters per pixel). Being that also I will stagger the personage (1.75m of height) to 0,875cm.
I will do this by the height map so this does not directly affect the project.
Can this cause a problem?
Physics, cross wall, visually, performance ...
Can I also scale the camera so it fits the character?
Right now, I just have to thank you.
If someone has a better solution:
Divide a terrain(height map) of 8192x8192 into four parts of 4096x4096 ... (how to do this?)