“The raw height data is stored in metres and must be scaled down to fit within the 256 block height limit in Minecraft. A maximum height of 2 500 metres was cho

“The raw height data is stored in metres and must be scaled down to fit within the 256 block height limit in Minecraft. A maximum height of 2 500 metres was chosen, which means Ben Nevis, appears just over 128 blocks high. “Although this exaggerates the real-world height, it preserves low-lying coastal features such as Bournemouth's cliffs, adding interest to the landscape.” - http://www.pcgamesn.com/minecraft/ordnance-survey-recreate-great-britain-largest-minecraft-world-ever-built-based-real-world-data http://www.pcgamesn.com/minecraft/ordnance-survey-recreate-g... So they are keeping to the 256 block height, but being slightly creative with the vertical scale...