In this letter, we present a new metric for characterizing the geometricconditions encountered in cellular positioning based on the angular spread ofthe base stations (BSs). The metric is shown to be closely related to thegeometric-dilution-of-precision (GDOP), yet has the benefit of beingcharacterizable in terms of the network parameters for BS layouts modeledaccording to a Poisson point process (PPP). As an additional benefit, themetric is shown to immediately yield a device's probability of being inside oroutside the convex hull of the BSs, which localization researchers willwidely-recognize as being a strong indicator of localization performance.
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