I'm looking for a way to apply spline interpolation to a gps track (GPX format). I am a regular QGIS user and also have GDAL libraries installed on my Mac if that helps.
Basically trail and ride information on MTB Project has a small set of points and actual paths are expanded via spline interpolation to reduce file sizes. I can download the tracks in gpx format, but they only contain a small set of points, giving me a track which resembles a jagged line which represents the small amount of points before interpolation. I want to apply a similar transformation to re-create the curved lines that are on the website, in a somewhat repeatable process that doesn't have me manually re-tracing each point with the spline drawing tool in QGIS.
Does anyone know of a way that I can easily apply spline interpolation to my gps track data to reproduce the splined track from MTB Project using free tools? Preferably on OSX?