Interactive publication
Back to the cataloguePlatformCase 09 of 11
Undocumented deduplication
Some ad platforms silently dedupe overlapping target geographies or audience segments across line items without disclosing the rule, causing reported vs. delivered reach to diverge in ways not explainable from inputs alone.
Class
Case to account for
Affects
2 conversions
01
Detection
Delivered unique reach is materially lower than the sum of non-overlapping requested cells, with no documented overlap in the request.
02
Mitigation
01
Request a delivery-level (not planning-level) geography breakdown from the platform where available
02
Independently pre-dedupe overlapping targets before submission so platform behavior can't be blamed for the gap
03
Affected conversions
H3platform-native IDs
OPENCell systemcell system
OPENMore in Platform
Asynchronous boundary updatesOptimized targeting expansionPlatform accepts only native IDsPlatform coordinate roundingPlatform maximum radiusPlatform minimum radiusRadius rounding / incrementsReporting at a coarser level than executionUnsupported exclusionsUnsupported polygon targeting