look up my (semi-)tutorial about making a map heights for making mountains
https://forums.totalwar.org/vb/showthread.php?t=83714

If your radar looks brighter where you added new land than thats because you made the radar-map lighter over there (I've added some effects into my radar-map and these show up in game as darker spots, changing the background of your radarmap can have a mayor impact on how your radar looks and feels)

radarmap2 is known but beter said once again too many than one too few times ..;)


G