When a deed decays, the buildings and walls dissappear, but the terrain, the terrain remembers.
After a server has been out for a while, after villages have come and gone, the dirt walls, pits and plateaus stay.
One of the reasons I love new servers is being able to explore new, fresh land.
Being able to find untouched land to build my new house.
Any tile that has been raised above the height of when the map was originally created, should decay it's excess height over a long period of time
This would remove dirtwalls
This would not remove mountains unless they were player created
Deeded areas should not decay
Decay should not occur arround structures
Walls/fences are structures
Paths are structures
Areas around water should have increased decay
Water is erosive
Land bridges - Reminder: Would still need to be undeeded AND not paths/fences to decay
Raised dirt in the water would decay and allow ships to pass again
Dirt tiles should have increased decay
Stone tiles should have reduced decay
Areas around "Should not decay" areas have a less likely chance of decaying governed by a function of distance
Prevents jarring edges at the border of "Should not decay" areas
The excess dirt should erode to a new location to fill pits