I second Dan's "Transformations Among Coordinate Systems", specifically dealing with aircraft/rotorcraft that might use common standard reference systems like North East Down (NED), East-North-Up, and other LVLH-like ones, etc... which are all dependent on the geodetic position.
@tomped1 Loved seeing you showcase the Electron example BTW.
If I ever get permission from my customer to show their weather data, I'll share examples of the Electron "app" I built to fuse their data with other time-dynamic sources. It used plotly.js for graphs (implying d3.js of course) and the python-shell npm module to call out to Python routines that manipulated data. Could have used the hdf5 npm but it was a little "touchy" at the time I tried it.
Thanks for specifying Dan’s idea, very cool stuff. Also, I’m glad you found my Electron showcase useful and moved on to create your own Electron app too.