I am working on something to fix that “snap to grid problem” (in almost every vector program such a function exists… excluding some exceptions, I hate the moment I hit the shortcut key that activates it… always need to look how to disable it again).
I red up on GPX formating:
1901-12-13T20:45:52.2073437Z
That should be the way for me to go in my “assistant”. I have also written/updated a perl script to match GPX tracks to images.
Even with an interval of once every two seconds I noticed this “granularity problem”. The solution I thought of is reducing (!) the number of GPX points by smoothing the track via brouter, then match the timestamps of the original GPX to that new track (up to the millisecond!) and then match the new GPX track to the numbered images (without any good date/time-info because of the ffmpeg mp4 → jpg conversion)
If you have a good (better?) way to do this with mapillary_tools, that would save me quite a bit of time 