Interactive publication
Back to the catalogueAdvertising semanticsCase 04 of 22
Cross-device location stitching
Location histories merged across a household's or individual's multiple devices via probabilistic ID-graph stitching can double-count visits or attribute one device's location to another device incorrectly, inflating cell-level audience counts.
Class
Case to account for
Affects
1 conversion
01
Detection
Same physical visit event appears against more than one device ID in the graph within an implausibly short time window (e.g. same location, same minute, two device IDs).
02
Mitigation
01
Deduplicate at the household/individual (stitched) level before cell aggregation, not at raw device level
02
Track and report the ID-graph match confidence tier alongside any cross-device audience count
03
Affected conversions
PointH3
OPENMore in Advertising semantics
Bidstream truncationCarrier NAT / multi-family IP poolingCorridor boundary oscillationDeclared resolution exceeds input accuracyDestination interestExcluded-area leakageFrequency across overlapping targetsGPS noise / boundary oscillationGPS-derived location accuracyHome location inferenceIP-derived locationLocation confidence scoringLocation interest versus presenceLookback window sensitivityMixed-provenance channel bundlePhysical presencePooled location sources in delivery logsPublisher-declared locationRecent presenceTreatment/control contaminationWork location inference