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 

Reinisch, B. W., and I. A. Galkin, Global ionospheric radio observatory (GIRO), Earth, Planets, and Space, 63, 377-381, doi:10.5047/eps.2011.03.001, 2011.

• http://spase.info/SMWG/Observatory/GIRO