For the QX1 PPK system, we experience sometimes unwanted triggers in the SBF file at the end of the file which break the geotagging. Learn here how to remove them.
Symptoms
If there are misdetected triggers at the end of the flight, the images typically are matched wrongly to these triggers which means that the images get badly assigned geotags.
In WingtraHub, you will typically see the following warning
"The time stamps of the images and the trigger events recorded for this project do not match well."
Report the issue on Hubspot!
This should not happen and can have different root sources which we can eliminate typically by robustifying our software - so please make sure to report your case on hubspot.
The best known case under which this can happen currently are bad current spikes at the QX1 PCB on loiter down or back transition that are misjudged by the drone for image triggers.
Save the data for your customer
You can use a Septentrio tool called sbf2sbf to crop the last part of your file and remove the triggers like that. Follow the following steps
1. Understand your issue exactly:
1. Note down the number of images of the flight (number of jpeg files under IMAGES), the number of commanded triggers (scroll to the middle of the json file where the record switch from raw to forwardprocessed and note down the sequence number + 1), and the number of recorded triggers (analyse SBF file with Spetentrios SBFAnalyzer and look at the plot "General File Information" --> "Message statistics" --> "ExtEvent1")
1. Follow the procedure here to identify a time stamp ahead of the unnecessary trigger events and to crop the file at this timestamp.