A non-transitory, machine-readable medium storing instructions that, when executed by one or more processors, effectuate operations comprising:
- segmenting a geographic region representation into a first set of geographic unit tiles, each geographic unit tile being a different geographic area of the geographic region representation;
- obtaining a set of geolocations at which mobile devices among a set of mobile devices are detected based on device signals transmitted by the mobile devices;
- for each geographic unit tile in the first set of geographic unit tiles, determining a respective amount of mobile devices observed within the respective geographic unit tile based on the obtained set of geolocations;
- for each geographic unit tile in the first set of geographic unit tiles, determining a respective weight based on the respective amount of mobile devices observed within the respective geographic unit tile to form a set of weights;
- assigning each tile of a subset of the first set of geographic unit tiles with a set of groups based on the set of weights, wherein assigning each tile of the subset of the first set of geographic unit tiles comprises assigning a first geographic unit tile in the first set of geographic unit tiles to a first group in the set of groups;
- building a first hash map based on a set of device identifiers, the first set of geographic unit tiles and the set of groups, wherein the first hash map comprises one or more key-value pairs;
- building a second hash map by traversing the first hash map, wherein:
- keys of the second hash map are based on the set of device identifiers,
- keys correspond to values in the second hash map, and
- values of the second hash map comprise paired elements;
- determining a first subset of devices among the set of mobile devices and a second subset of devices among the set of mobile devices by traversing the second hash map, wherein the first subset of devices is associated with the first group, and wherein the second subset of devices is associated with a second group that is also from the set of groups;
- determining whether a second geographic unit tile is to be assigned to the first group or the second group based on a comparison between the first subset of devices and the second subset of devices;
- assigning the second geographic unit tile to the first group in response to a determination that the second geographic unit tile is to be assigned to the first group;
- and
- building a region map comprising the set of groups, wherein each of the first set of geographic unit tiles indicates one of the set of groups.