![]() GPSBabel does a pretty good job on filtering, if you don't overdo (that is: don't filter out to much track points). If you look at the track infos for the track versions below, you will notice that filtering out trackpoints does have some effect on the calculated length, and it has a rather large effect on the up/down altitude differences. See the examples below to get an idea on how filtering out trackpoints affects the "quality" of your track. Note: i have no experience with faster moving things, Space Shuttles or the like :-) 500.įinding out what is "reasonable" depends on your track distance, and whether you recorded it while hiking (=slow), cycling (=medium) or with a motorbike or car (=fast). ![]() number of waypoints to "something reasonable" - try e.g. ![]() Select "mytrack-filtered.gpx" as Output file. Select your GPX file - say, "mytrack.gpx" - as Input file. (you can also use tools like Garmin's BaseCamp for that same purpose - look here for some instructions.) 1. Reducing the number of trackpoints (You can also use it to do all sorts of other stuff, like correcting / shifting / stripping out timestamps - see the GPSBabel documentation. You can give it a maximum number of trackpoints, and it will reduce your GPX file to that given amount. To do this, you can use the great (and free) GPSBabel tool. Not only that this can greatly reduce the size of the GPX files, it can actually make them "better" (see below). I mostly record tracks with a rather high frequency (to get as many trackpoints "as i can get"), but to publish them, it is often a good idea to minimize the amount of trackpoints. the recording frequency of the track points.the length of the track (obviously) and.A GPX track file can become quite large, depending on:
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