Methods, systems, computer-readable media, and apparatuses for labeling crowd sourced data are presented. In some embodiments, a method for labeling crowd sourced data may include: receiving an atmospheric pressure signal from a mobile device associated with a venue, the mobile device comprising an atmospheric pressure sensor; clustering a plurality of atmospheric pressure signals from a plurality of mobile devices associated with the venue into a plurality of clusters; assigning a label to each of the plurality of clusters; receiving signal measurements from one or more of the plurality of mobile devices; and applying the label to the signal measurement.