How Accurate Is Geofencing Advertising?
Geofencing accuracy depends on the technology used, the size of the fence, and the environment. Here is an honest assessment of what to expect — and how Mediavision2020 maximizes precision.
Modern geofencing platforms using GPS-based polygon fencing achieve 85–95% accuracy for outdoor locations with clear sky visibility. This means that 85–95% of devices detected within the fence are genuinely inside the physical boundary — not on an adjacent street or in a neighboring building.
Factors That Affect Geofencing Accuracy
1. Fence Shape: Polygon vs. Radius
Radius-based fences (circles drawn around a point) are less accurate because they include areas outside the target location. Polygon fencing — which Mediavision2020 uses — draws boundaries that follow the exact shape of a building, parking lot, or property line, dramatically reducing false positives from people in adjacent areas.
2. Fence Size
Smaller fences are inherently more precise but require higher GPS accuracy to avoid false exclusions. Mediavision2020 recommends a minimum fence size of 1,000 square feet for outdoor locations. Fences smaller than a typical parking space may produce inconsistent results due to GPS margin of error (typically ±5–15 meters for consumer smartphones).
3. Indoor vs. Outdoor Environment
GPS accuracy degrades indoors because satellite signals are attenuated by building materials. Indoor accuracy is supplemented by Wi-Fi triangulation and cellular tower data, which are less precise (±50–100 meters). For indoor venues like malls, convention centers, and hospitals, Mediavision2020 recommends drawing the fence around the entire building footprint rather than specific interior zones.
4. Device Location Permissions
Geofencing only captures devices that have location services enabled. Approximately 70–80% of smartphone users have location services enabled for at least some apps, meaning a geofencing campaign reaches the majority — but not all — of devices in a given area. This is a known limitation of all location-based advertising platforms.
How Mediavision2020 Maximizes Accuracy
Mediavision2020 uses a multi-signal approach that combines GPS, Wi-Fi, and cellular data to determine device location. Our polygon fencing tool allows campaign managers to draw precise boundaries that follow property lines rather than approximating with circles. All fences are reviewed by our campaign team before launch to ensure boundaries are correctly placed and sized for the target location.
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