Actually I believe there are 2 different data. The number of level of the building, (from which you can extrapolate an height) and the actual height in meter (w

Actually I believe there are 2 different data. The number of level of the building, (from which you can extrapolate an height) and the actual height in meter (which is much harder to estimate as a random mapper). Street Complete prompt you for the former IIRC.