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Whopper
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No.
Flatness is not about average elevation.
Flatness is about smallest distance between lowest and highest points.
drøn-
dont let @BareNecessities come in here with Norfolk
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It doesn't make sense to take the highest and lowest points because that doesn't take into consideration the "lumpiness" of the terrain. What if a country has a lower spread between highest and lowest points but goes constantly up and down vs another that is constantly flat (let's say in 99% of the surface), but has a highest maximum elevation (in 1% of the surface)?
Surely the latter is more flat, if the average elevation is lower than the former.
Hence, the average is a more significant measure of flatness
amey