Colored by compensated vertical speed

Question

Colored by compensated vertical speed

scls19fr opened this issue 10 years ago · 8 comments

Hello,

it will be nice to add a new kind of color for track.
Track "Colored by compensated vertical speed"

You need to calculate total energy (kinetic energy + potential energy)
see https://en.wikipedia.org/wiki/Variometer#Total_energy_compensation_in_theory

It's very useful for gliders pilots.

Kind regards

Sébastien

Answer 1 · 2015-05-09T18:34:13.000Z

Hi Sébastian,

This is a good idea, and should be fairly easy to implement. Could you send me an example glider IGC file and tell me the mass of the glider so I can work on an example? My email address is in my GitHub profile.

Cheers,
Tom

Answer 2 · 2015-05-09T18:37:27.000Z

I see that you've just posted http://pastebin.com/Kz9PYR1v from an ASW 28 (maximum take off weight 575kg) in #2 which is all I need.

Answer 3 · 2015-05-09T18:41:47.000Z

Oops, nope, http://pastebin.com/Kz9PYR1v has very long gaps between thermals. Do you have an IGC file from a real flight?

Answer 4 · 2015-05-09T18:45:36.000Z

I'm not real glider pilot anymore... just Condor.

I also noticed that there is a lot of gap. I wonder if that's not a Condor bug in there IGC ouput.

I can provide an Excel file from a binary Flight Track Record (.ftr) file if you want.

Answer 5 · 2015-05-09T19:15:57.000Z

Ah, OK, I think I see what is happening with the Condor-generated IGC files.

igc2kmz was designed to visualize paraglider flights. IGC files often have large position and altitude errors in them. igc2kmz tries to filter out these errors by removing horizontal speeds greater than 40m/s and vertical speeds greater than 30m/s. These assumptions are clearly not valid for gliders. I'll relax them.

Answer 6 · 2015-05-09T19:25:32.000Z

Ok. You can notice that there is 2 times more points in binary (and so excel file) than in igc file.

IGC time resolution is 1 s but FTR is around 0.5 s

You can also see in Excel file that I have 4 interesting data Qx, Qy, Qz, Qw (quaternion) https://en.wikipedia.org/wiki/Quaternions_and_spatial_rotation
A great improvement could be to replay flight in Google Earth.

Answer 7 · 2015-05-09T19:28:51.000Z

Google Earth isn't great at replaying flights. Doarama, on the other hand, is fantastic - and it runs in your web browser, so it's easy to share your flights with others. Have you seen it?
http://www.doarama.com/view/2171

Answer 8 · 2015-05-09T21:17:14.000Z

You might use something named like "climb (with energy compensation)"
and also use meter per second like climb