Section 3: Data Acquisition for Telemetry Overlay
Introduction to Telemetry Overlay
Telemetry is the in-situ collection of measurement of various data points such as speed, elevation, G force, track etc. In our sport we use Global Positioning Satellite or GPS to collect this information. Most of us record the track in apps such as Gaia GPS.
While driving we feel the adrenaline but by the time we look the same drive footage, it does not look that impressive. This is where in my opinion the Telemetry Data overlay plays an important role as it helps to highlight the rollercoaster ride that we experience. I like to overlay the Track, Speed, Speed Profile and Elevation profile along with the Compass to give an immersive experience of the drive.
Integration with Insta 360 X3
We can record the GPS data embedded with the footage we record while driving. This can be achieved in two ways. In Insta360 X3 camera, if GPS remote is used to record video, it also records the GPS data by default. In case a phone is used as a remote, in that case the user can enable GPS data recording as well. However, in my experience the data collected using phone as a remote is quite unreliable and gives erroneous information.
GoPro Max, however, records the GPS data by default in the device itself and it does not need external sources to get the data.
Another way to overlay telemetry data is using external independent data sources such as Gaia GPS. However, it becomes cumbersome to sync data with the footage to overlay on the video data source.
An issue with GPS data is, however, good the data source might be, it still sometimes looks different than the footage. Because the data is collected using satellites and there is always a time delay. This is more pronounced while looking at Speed data, while a vehicle would have come to a stop in the footage, but the data recording will show gradual decrease in the speed to zero. Another issue is if you are using maps to show the track, it might not correlate to the actual footage, due to the shifting dunes as well.
In this video I recorded at Faya (see the previous post) I have overlayed a mini map showing the track, and speed and direction. You will see that the dunes on the map don't match all the time with the footage.
In the following video I recorded at Badayer I have overlayed the speed provided as well as elevation profile. These two are normally an approximation rather than cent percent accurate data.
PS: I plan to update and revise certain sections to enhance clarity, streamline information for brevity, and improve language and grammar.