I am struggling with the multiplexer metadata file, the SensorRelativeAzimuth and SensorRelativeRoll parameters in particular. I think they are supposed to both be 0, but am not sure. The sensor was mounted on a UAS on a gimbal and was pointing straight down (nadir view). I have already read somewhere that the SensorRelativeElevation should be -90 with a camera pointing straight down.
Another thing I am not sure about is the UnixTimeStamp. The UAS autopilot is a PixHawk and seems to store date/time messages relative to when the PixHawk was powered up. So what I did was determine the Unix Time for when the sensor was powered up and then added each date/time message to this initial start date. This seemed to give me my incremental time units for all the AHR2 messages (these are the messages are subset from all the other messages the autopilot logs). Everything seemed to run fine with the above parameters set to 0, but wanted to see if anyone else has had this question.
Note: I also had to do the time shift (-27) and things started to line up as they should.