In my many years of designing maps I have found this template to be quite useful. I think you will find that it allows for far more building tricks. I have always felt that it also gives an added level of texture to your terrain.
Why 20 :
Modulating the terrain to include sea, beach, marsh or grass wherever you need it is quite simple.
The highest terrain level that allows the placement of hop or wheat farms is 24 clicks up from minimum height.
The maximum height raise that will still allow sprites to move between tiles is 16.
So, 20, a nice, round, even number will make the math involved with map making far easier.
Well what can I say this utility map extends my capabilities to a whole new level it's something that every mapmaker should have.
A wonderful and,Im sure,very hard job but totally worth dl the fact that you can place farms on this heigt is a new thing to me.This map is briliant.Nice job mate.