This tutorial will walk you through uploading a Zone Set with Calibration data. 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.
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 Calibration Zone Set by uploading a shapefile.
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 upload a Zone Set. You can find the templates for uploading the shapefiles with calibration data in the create/edit Zone Set pop-up module windows in StreetLight InSight.
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.
Uploading a Shapefile that Contains Count Data
Zone Sets with calibration data can be uploaded with the calibration values included in the shapefile. This is similar to uploading a shapefile without calibration data, but with some extra steps.
Step 1: First, make sure that your shapefile is properly structured for upload and has calibration data such as ADT, AADT, AWDT, or AAWDT. We recommend following the shapefile template that can be downloaded from the Create Zone Set window.
Step 2: Create a new Zone Set, name the Zone Set, choose the Zone Set Type that matches your shapefile, and upload your shapefile as usual. Learn more. Click on the “Include Calibration Data” checkbox and click “Continue”.
Step 3: A new page will appear giving you options to choose the fields for the calibration data. Choose the appropriate fields from your shapefile. Make sure to choose a value for every field. If you don't have a value for a specific field choose the "[Leave as Blank]" option.
Select fields from your shapefile that correspond to the field definitions below.
- Calibration Type: Field indicating whether your counts are AADT, ADT, AWDT, or AAWDT.
- Calibration Value: Field containing the traffic counts for the specific Zone.
- Personal Traffic Ratios, Commercial Medium Duty Traffic Ratios, and Commercial Heavy Duty Traffic Ratios: Fields indicating the percentage breakdown of traffic.
- Optional Fields: Fields indicating the collection methods used and any other notes that are important for your Project.
Step 4: Review all the choices and click “Continue”
Step 5: You’ll see the list of your Zones on the left. You can click on any of them to see the calibration data that was appended to them. Click on each of the Zones to check the values were loaded as expected and click Save.
You’ll now be able to use this Zone Set as a Calibration Zone Set when setting up a Project.