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TRK to GPX conversion

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ydespond
Posts: 14
Joined: Mon Mar 23, 2015 1:06 pm

TRK to GPX conversion

Post by ydespond »

I tried to use the Python script 'alp2gpx' to convert TRK files to GPX.
I compare the resulting GPX file with the GPX file generated by the export function of AlpineQuest.
I found that the elevation and the timestamp are not the same.
After reading the code of 'alp2gpx', I am convinced that 'alp2gpx' do not modify the numbers extracted from the TRK file.
At this point, I suppose that AQ makes some corrections on elevation and timestamp when exporting from TRK to GPX.

Could you confirm that ?

Best regards.
Psyberia-Support
Site Admin
Posts: 6406
Joined: Wed Apr 14, 2010 9:41 pm

Re: TRK to GPX conversion

Post by Psyberia-Support »

Hi,
For the GPX format, AQ does export elevations in the EGM96 model (elevation above sea level, same values as displayed within the application) and timestamps in UTC as specified by this format.

alp2gpx may export elevations in the WGS84 model because they're stored like this in the TRK format (but I'm not the author and haven't checked). Concerning the timestamps I don't know but they must be in UTC for GPX.
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ydespond
Posts: 14
Joined: Mon Mar 23, 2015 1:06 pm

Re: TRK to GPX conversion

Post by ydespond »

Thank you for your answer which explain exactly the reasons of the differences.

I will try to contact the author of 'alp2gpx' to see how to adapt the programme.

Best regards
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