How does Single Factor Calibration Work?

To generate estimated counts, or “Calibrated Index values,” StreetLight InSight measures StreetLight’s sample in the specified calibration Zones during the Project Data Period. It then creates a ratio or calibration factor between the StreetLight database sample and the count values contained in the calibration Zone Set. (Count values for the calibration Zone Set are either provided by the user or generated via StreetLight’s AADT algorithms). 

StreetLight Calibration Sample - Navigation-GPS: 

Our StreetLight sample for Navigation-GPS is based on the number of trips in StreetLight’s database for a specific Zone. 

Calibration for LBS with Pass-through:

Our StreetLIght Sample for LBS with Pass-through is based on a normalized number of trips in StreetLight's database for a specific Zone.

StreetLight InSight then averages the calibration factors of every Zone in the calibration Zone Set. (Note: If there are more than 5 Calibration Zones, outliers are dropped.) Next, StreetLight InSight applies that average to the Metrics for the entire Project. See the table below for an example. Calibration Zone 1, Calibration Zone 2, and Calibration Zone 3 all have AADT values that are independent of one another. 

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