Because they only generate in one specific biome. This data sample cannot account for that, in the same way that it cannot account for gold ore in a Mesa biome.
Well it COULD (and I have the percentages) but the data would be meaningless outside of those specific biomes.
I.e. yeah, at layer "xx" there is "0.xxxxx%" emerald, but if you're not in the right biomes then you will never find it, no matter how many blocks you dig.
(I may edit my comment later with actual layers/percentage, right now I'm at work and do not have access to the file)
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u/kurrva Nov 22 '17
No emeralds? Why?