Re: [Gpsbabel-misc] Timeshift of gpx-data - was: Nokia mobile phones, eg C5 and sports tracker

[Al B. <gps...@ml...>]

Am Fr, 24 Sep 2010 10:12:14 CEST schrieb Robert Lipe:

> On Fri, Sep 24, 2010 at 8:15 AM, Al Bogner
> <gps...@ml...>wrote:
> 
> > Am Mo, 20 Sep 2010 22:53:25 CEST schrieb Al Bogner:
> >
> > > Is it possible to convert dat-Files, created by the Nokia Sports
> > > tracker http://store.ovi.com/content/31721 with gpsbabel to gpx?
> > >
> > > IMHO is the gpx-file broken, which is created by the Sports
> > > Tracker. The file contains binary data. If I load it with Google
> > > Earth (linux) I don't see a track, but things like speed.
> > >
> > > Is it possible to repair gpx files with gpsbabel?
> >
> > I found a simple way to view the track with Google-Earth:
> >
> > gpsbabel -i gpx -f sportstracker.gpx -o kml,units=m -F test.kml
> >
> > test.kml is shown with Google-Earth
> >
> > gpsbabel -i kml -f test.kml -o gpx -F test.gpx
> >
> > The gpx-file created from the kml-file _cannot_ be shown with Google
> > Earth. Are options missing, when I convert from kml to gpx?
> >
> 
> That doesn't make sense.   There is wacky KML we can't read, but we
> should do a reasonable job with our own KML output from a GPX
> source.   Once again, if you want us to look at the failing case, you
> really need to provide a sample we can investigate.

Robert, of course I will provide a sample file. Did I miss a mail,
where you asked for it? I didn't see any response to the 1st mail of
this thread. This mail contains an attachment with a sample, where

W178218105.dat is the default-file created by Sportstracker and
W20100826180249.gpx is created by Sportstracker from W178218105.dat



> > When I use the "repaired" gpx-file with gpsphoto it works, but not
> > correctly.
> >
> > I think, that sportstracker doesn't save the time in UTC, but in
> > local time. Mayabe it is a problem with the daylight saving time. I
> > have to test this.
> >
> 
> If it's saving local time in GPX, it's broken.  GPX clearly specifies
> that timestamps are UTC.

I agree, but this doesn't help.
> 
> >
> > Can I do a timeshift shomehow with gpsbabel to get a gpx-file with
> > UTC?
> >
> 
> Investigate the 'move' option of our track filter.
> http://www.gpsbabel.org/htmldoc-development/filter_track.html#fmt_track_o_move

As mentioned in another mail, I am testing at the moment with:

gpsbabel -t -i gpx -f "$1" -x track,move=-2h -o gpx -F out.gpx \
-o kml,units=m -F out.kml

The kml-file can be loaded with GoogleEarth, while the gpx-file can't.
If I do similar things with my WBT 201 and gpsbabel, I can load
gpx-files with GE.

-x track,move=-2h doesn't shift all times, but it looks like it is
enough to get gpsphoto work.

Al