Estimating floor numbers and floor labels in a structure

A system comprising one or more servers that are operable to:

• select a set of altitude envelope distribution constraints for a physical building;
• generate a set of a plurality of altitude envelope distributions for the physical building in accordance with the set of altitude envelope distribution constraints, each altitude envelope distribution comprising a plurality of first altitude envelopes, each of the first altitude envelopes corresponding to a respective estimated floor number of the physical building, each floor number corresponding to multiple altitude envelopes;
• generate an aggregate altitude envelope distribution for the physical building using the set of the plurality of altitude envelope distributions and in accordance with the set of altitude envelope distribution constraints, the aggregate altitude envelope distribution comprising a plurality of second altitude envelopes, each of the second altitude envelopes corresponding to a respective estimated floor number of the physical building;
• determine a reference altitude of the physical building;
• and
• determine an absolute aggregate altitude envelope distribution using the reference altitude and the aggregate altitude envelope distribution, the absolute aggregate altitude envelope distribution comprising a plurality of third altitude envelopes, each of the third altitude envelopes corresponding to a respective estimated floor number of the physical building.