Do any data appear as "poor quality" on the site? What does this mean?
Indeed, as you can see in the graphic below, Telraam will sometimes indicate that some data are of poor quality. This article will explain what this means.
Several explanations are possible:
- Per time slot, the Telraam needs to receive as much data as possible in order to validate the "good quality" of the data. In a one hour time slot, the recorded data will appear as "Poor Quality" if the Telraam has been active for less than 30 minutes (i.e. 50% of the time slot). So in case of a temporary outage, in case of a light problem (for example if the sun rises at 6:40 am, or sets at 7:20 pm, or if at some point in the day, the sky is very overcast and dark, the Telraam will tell you that the data for that time slot will have been potentially biased and therefore of "Poor Quality".
- If the Telraam has been inactive for an hour, the system will "adapt" the data to give you an approximate idea of the amount of traffic. These corrected data will therefore appear as "Poor quality" if the Telraam has been inactive for more than 30 minutes. For example, if between 10 and 11 am, your Telraam has been active for only 20 minutes, the system will multiply the collected data by 3 to give you an approximate idea of the traffic during that hour.
- Moving objects perceived by the Telraam can also affect the quality of the data. If for example, a tree or an advertising flag is in front of your window and if it is windy.... the movements of these "objects" can also affect the perception of your Telraam.
- If there is a serious traffic jam (i.e. if the vehicles are stopped for a relatively long period of time), the system will consider that there is no traffic during this period (since no movement will be detected).
What should you do in case of 'poor data quality'?
1. Check on your camera image if there are any moving objects (e.g. trees) and remove them (if possible). Maybe a tree has grown in the spring and is covering (partly) the view? Follow these steps to check your image: Verify or update the camera view
2. Add a sun reflective screen. You should have received this together with your Telraam device. It's a black paper you can cut and fold to cover your camera as a sun reflective. You can find it as well in the attachment below.
3. Poor data quality can be caused by poor internet connection. Follow these steps: The connection between my Telraam and the wifi is (sometimes) lost.
4. Finally, if you have had your Telraam for some time, you should know that we are constantly trying to improve the Telraam system. The latest version (v11) was released in August 2021 and you can update your Telraam softare by clicking here: "Updating the Telraam software by yourself"