Converts a log file from Sigma Data Center v3 to Garmin TCX file.
$ ./bin/slf2tcx < 2014_09_04__07_21.slf > workout.tcx
Tested only with log files from Sigma ROX 6.0, no GPS data conversions are performed.
Combines data from a TCX workout and corresponding GPX track, recorded
by some other device. For each track point in TCX at time t it
samples GPX track at time t and stores position and elevation of the
track in TCX.
$ cat workout.tcx | ./bin/tcx+gpx 'Track_2014-09-04 072023.gpx' > for_upload_to_strava.tcx
The conversion could be inaccurate:
- Simple linear interpolation is used for sampling track points. Probably, it's fine as track points are close to each other.
- Clock in a cycling computer without GPS receiver is likely off from the clock in a GPS device. Provided that the difference is significant, GPX track will be sampled at wrong points. A possible solution would be using cross correlation on elevation data from TCX and GPX, finding a proper lag and compensating for it.