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Things I (didn't) Learn (yet): Setting Elevation of Line Endpoints in Cesium CZML

 The F2 skip traces in Cesium have looked a bit odd:


Whyyyyy?????

It's because they're starting from sea level, not the altitude of the station.... I think... What follows are somewhat random development notes.

Relative to Ground: True, Alt: 0


Relative to Ground: True, Alt: 3600 meters



Relative to Ground: True, Alt: 1772.717



Almost!!!

Relative to Ground: true, elevation: 1770.829467773438



I got the more accurate elevation from the elevation plugin using:
{{ tx_lat }},{{ tx_lng }}|{{ rx_lat }},{{ rx_lng }}



Not quite there yet....
To get this close, I had to run with 



But the CZML schema says:

So, it seems like the correct altitude in this case should be 0. (Start the line on the ground.) But, if I put in zero for altitude, I get the result shown above


Found a reference to quaternions. Ahhhh, quaternions.




References

Ionosonde Data

This was made possible with data collected by 


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