Interactive publication
Back to the catalogueMeasurementCase 03 of 05
Modal-cell centroid pile-up
Assigning each probabilistic observation to its single most-likely cell piles ambiguous mass onto registry/population centroid cells, manufacturing false density at vendor fallback points.
Class
Case to account for
Affects
2 conversions
01
Detection
Impression density spikes at known centroid cells (city centers, ZIP centroids) uncorrelated with population or POI mass.
02
Mitigation
01
Apportion fractionally by probability mass (expected_probabilistic basis)
02
Never report modal-cell rows as measured
03
Flag integer counts from probabilistic sources
03
Affected conversions
IP lookupH3 (probabilistic crosswalk)
OPENPointH3
OPEN