Shows geographic relationship between device's most recent known location and the given region. If the device has no last-known location, no device location observation will be attached, and confidence_in will be 0. The relation will always have a geojson property of type FeatureCollection which will contain at least the Feature for the region. If a last known location exists for the device, the associated device location observation will be attached, and a feature will exist in the feature collection.
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