no objections here, all sounds good!
Was there any reason for Raw heightmaps to be of size n^2+1 ? (while you're at it 
)
These changes have been made in svn. Note that the only other likely impact from those listed above is that you will need to remove that hardcoded false argument from your TerrainPage/Black construction.
Is it also possible to fix the errode function, it uses a Double indexed array while the terrain uses a single…
That's a weird method indeed… seems like it should operate against the data it already has.
I agree in full, I had to convert to a dual indexed array then convert back to a single index just to use it…