Closed feklee closed 4 months ago
I have investigated the files and the "problem" is not in the time/timezone. Your tracks are a combination of a car ride and a walk and this does not work very well with the outlier elimination algorithm. If you disable outlier elimination in the Options (Data->Filtering->Eliminate GPS outliers) then you will get a much "cleaner" path and the times will be as expected.
And by the way, thank's for the donation :-)
Your tracks are a combination of a car ride and a walk and this does not work very well with the outlier elimination algorithm.
Thank you for pointing that out! I will keep this option disabled as I generally use multi-mode transportation. In this case it was walking plus using train, metro, and taxi.
However, the problem with the offset did not go away. See my photo DSC_0361.JPG.gz. I took that with my phone at 12:05:47, stopping at a shop window when walking. Yet, according to GPXSee, I was near that location at 03:32:06:
03:32:06 is the relative time from the track start. If you want the absolute time, you can enable it under Data->Position Info->Date/time (it will be shown next to the position marker on the map).
Thank you, that explains it all!
For most of my GPX files, the relative time is equal to the absolute time, simply because the app that I use for tracking on my phone starts a new track at midnight. Occasionally, my phone is turned off at midnight. This when I get the “offset”, which isn’t an offset after all.
Applies to: Version 13.18 (x86_64, Qt 6.6.1)
Have a look at the following tracks. Both were recorded with GPSLogger on Android while in Japan.
20231211.gpx.gz: All good, times are correctly shown in the local Japanese time zone UTC+09. According to what I see in GPXSee, I start moving around 8:00, which is plausible.
20231212.gpx.gz: According to GPXSee, GPS tracking starts at midnight, and I head out around 1:30 in the morning. This is incorrect. Garmin BaseCamp and Google Earth Pro both report the start of the GPS tracking at 7:33.
Is this an issue with GPXSee?
In the files themselves I cannot see anything special. Not sure if this is even a time zone issue. It looks like GPXSee simply moves the first time in the file to midnight.
PS: Downloading this version from SourceForge took more than 2 hours. I tried from Indonesia, from the UK, and from Finland.