This tutorial will walk you through drawing a Calibration Zone Set. Our Calibration Feature is a great tool for users who want to get estimated counts rather than our StreetLight Index. Calibration using your own count data is a feature offered to all users of StreetLight InSight. These Zone Sets with Calibration data can be used in the following Project Types: Zone Activity Analysis, O-D Analysis, O-D with Middle Filter Analysis, O-D to Preset Geography, and Segment Analysis. Learn more about how to create a Calibrated analysis, check out our solutions guide.
There are two ways to add calibration data to a Project: By using local count data in a Calibration Zone Set or by using StreetLight Data’s 2017 AADT Metrics, which are available in Gold and Platinum StreetLight InSight subscriptions. As with any Project in StreetLight InSight, the first step of using the Calibration Feature is to create a Zone Set, in this case a Calibration Zone Set. For this tutorial, we will go step-by-step to help you set up a Calibrated Zone Set by drawing your Zones and uploading local count data.
What is a Calibration Zone Set?
Calibration Zone Sets are comprised of at least one Pass-through Zone. The Zone can either be a small polygon Zone (like a gate) or a line segment Zone drawn to cover a road. You will use this Zone Set when running your Projects in order to calibrate our Metrics to give you estimated counts. If using “Calibrate with my Zone Counts,” then creating the Zones follows our typical process, but with an extra step: adding the calibration data. Remember that these Zones can be created by either drawing or uploading, but in this article we will focus on how to draw a Zone Set and add the calibration data manually.
Note: It’s perfectly fine to have a Zone Set where some Zones have calibration data and some do not. It’s also fine to have a Calibration Zone Set with anywhere from one Zone to 100+ Zones.
Draw a Calibration Zone
Heads Up: When you create a Calibration Zone Set by drawing Zones, you will need to add local data to each new Zone individually. The following step-by-step guide will show you the process for a single Zone. Repeat this process as many times as necessary to create your Calibrated Zone Set.
Step 1: Create a new Zone Set, name the Zone Set, choose the Zone Set Type as desired.
Step 2: Draw and name your Zone. Learn more.
Step 3: Mark your Zone as Pass-through.
Add Calibration Data to a Pass-through Zone
After marking the Zone as pass-through, a checkbox for “Calibration Data” will appear. Check the box to add your local traffic count data.
Step 1: Enter your traffic count data. Fill out the fields as follows:
- Calibration Type: Select whether your counts are AADT, ADT, AWDT, or AAWDT.
- Calibration Value: Input the traffic counts for the specific Zone
- Personal Traffic Ratios, Commercial Medium Duty Traffic Ratios, and Commercial Heavy Duty Traffic Ratios: If you have information on the breakdown of traffic input it here. If not, use the default settings.
- Optional Fields: There are two optional fields available so that you can add information about the collection methods used and any other notes that are important for your Project.
Step 2: Click “Save”.
Step 3: Continue to draw additional Zones and add the calibration data following the same steps as above to complete your Calibration Zone Set. Once the Zone Set has been saved, you’ll be able to use this as a Calibration Zone Set when setting up Project.
Note: Reminder, if you are calibrating using StreetLight AADT, you do not need upload local traffic count data for calibration.
- We recommend you save the Zone Set after the creating the first Zone and then editing the Zone Set to add more Zones. This approach will prevent loss of effort in the event of an interruption to the session.
- If you already have a Zone Set saved in your StreetLight InSight account that is not yet used in a project, you can turn it into a Calibration Zone set by editing it and adding local traffic count data for any applicable Zones. You do not have to create a new Zone Set.