1. A method, comprising: receiving, using a processor, data units from a plurality of communication devices over time, wherein each data unit comprises location information; correlating, using the processor, the data units with regions of a map using the location information; assigning, to each data unit, a validity score; for each data unit, decrementing the validity score of the data unit over time according to a region specific invalidity rate for the region correlated with the data unit; invaliding each data unit responsive to determining that the validity score of the data unit does not exceed a minimum validity score; determining, using the processor, data densities for regions, wherein a data density specifies a number of data units received from the region over a period of time; and presenting, using the processor, an indicator of data density of the regions.