GPS-derived location accuracy

Advertising semantics

A GPS fix's reported horizontal accuracy (often tens to hundreds of meters, worse indoors/urban canyon) is frequently discarded downstream, letting a low-accuracy fix be indexed at a resolution finer than it can support.

Detection

Fix accuracy radius greater than the edge length of the H3 resolution being indexed to.

Mitigation

Cap H3 indexing resolution to the fix's reported accuracy radius
Drop or down-weight fixes with accuracy worse than a defined ceiling (e.g. > 500 m)

Affected conversions

PointH3