Was doing some mapping yesterday with the I2 with X5s 12mm lens.    I was flying at 146' AGL,  MSL is 230'.   The exif data for the altitude was between .804m to 1m.   I was using autopilot for the mission.  I flew the same mission the week before with autopilot and the exif altitude 127m.   

During the same mission yesterday flying with the go4 app my exif altitude ranged between 1m to 27m   when i was flying ~100' AGL.   

Anyone else seeing these issues.   Is there a fix?

This is just a guess but it sounds like there is a bug in the firmware and the creation of the geotags. If you have a way to access the actual flight logs, you can use the flight log timestamp to recreate the geotags. For  example, if you have a flight log with the timestamp, lat, lon and elevation ... that data can be used to match against each image timestamp to provide new accurate geotags as a workaround.

You could use exiftool to complete this task, details here: http://u88.n24.queensu.ca/exiftool/forum/index.php?topic=5996.0

You'd need a log file with this format in CSV:

GPSDateTime,GPSLatitude,GPSLongitude,GPSAltitude

Link to exiftool: https://www.sno.phy.queensu.ca/~phil/exiftool/

You can also use a tool like GeoSetter which has geotagging functions.

Thanks,
DroneMapper

DroneMapper Posted at 2018-2-5 08:35
This is just a guess but it sounds like there is a bug in the firmware and the creation of the geotags. If you have a way to access the actual flight logs, you can use the flight log timestamp to recreate the geotags. For  example, if you have a flight log with the timestamp, lat, lon and elevation ... that data can be used to match against each image timestamp to provide new accurate geotags as a workaround.

You could use exiftool to complete this task, details here: http://u88.n24.queensu.ca/exiftool/forum/index.php?topic=5996.0

Thank you for the information DroneMapper,  very helpful.   I will reinstall the firmware and see if that corrects the issue.

Take care,
ETA