This very useful GPS Smoother was created by Brenda Zysman - www.potter.ca and allows you load a gpx file and apply a few different "smoothing" algorithms to the elevation. The resulting gpx file can be copied and saved to a file and then imported into your Tacx trainer.
Smooth - uses simple box-score smoothing to smooth the elevation over 5 points.
Set Range - lets you set the maximum and minimum slope.
Flatten - lets you set the maximum change in slope between any two points.
Slide the triangular handles on the smaller graph to select only a portion of the ride to smooth. This allows you create a ride similar to a Slope-Distance Catalyst ride.
1. Select a gpx file:
Missing elevation tags have been added and set to a value of 100 meters.
2. If your gpx file does not contain elevation data, you can add elevation
values. This could be a slow process, depending on the number of points in your gpx file. The
elevation service is subject to usage limits of 25,000 total locations per 24 hour period, so
this functionality may be temporarily unavailable.
3. Smooth the data:
4. Check out the resulting slope. Hover over a point to see details: