Comments on: Uploading trip data to your GPS http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/ The MTBGuru weblog and forums Wed, 25 Jan 2012 22:41:08 +0000 hourly 1 http://wordpress.org/?v=3.0 By: ragetty http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/comment-page-1/#comment-105 ragetty Wed, 31 Jan 2007 21:10:51 +0000 http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/#comment-105 TrailRunner is donationware, and is worth every penny. it looks like an app for runners, but actually it's main function is for networking your gps routes with anybody else's you can get hold of, so works great for bikers, etc. too. functions include route repair, assorted map downloads, new route creation, blah blah blah ... the learning curve is a little steep at first, principally because it's scope is not immediately obvious, and there are a few tricks to getting the best (geekiest) results, but it's well worth the effort. TrailRunner is donationware, and is worth every penny. it looks like an app for runners, but actually it’s main function is for networking your gps routes with anybody else’s you can get hold of, so works great for bikers, etc. too. functions include route repair, assorted map downloads, new route creation, blah blah blah …

the learning curve is a little steep at first, principally because it’s scope is not immediately obvious, and there are a few tricks to getting the best (geekiest) results, but it’s well worth the effort.

]]> By: mtbguru http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/comment-page-1/#comment-102 mtbguru Tue, 30 Jan 2007 20:30:29 +0000 http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/#comment-102 Thanks for the tip, I'll need to check out <a href="http://www.trailrunnerx.com/index.html" rel="nofollow">Trailrunner</a>... and it even seems to be freeware. I would think though, that retracing/navigating a given route after doing the GPSBabel filtering on it (reducing the track to say 500 equidistant points) should be fairly easy, unless the route is extremely long and the distance between the points very large. For logging the track or if you're interested in elevation profiles that filtering is probably not a good practice as you say (more adaptive filtering would be in place then). Thanks for the tip, I’ll need to check out Trailrunner… and it even seems to be freeware.
I would think though, that retracing/navigating a given route after doing the GPSBabel filtering on it (reducing the track to say 500 equidistant points) should be fairly easy, unless the route is extremely long and the distance between the points very large.
For logging the track or if you’re interested in elevation profiles that filtering is probably not a good practice as you say (more adaptive filtering would be in place then).

]]> By: ragetty http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/comment-page-1/#comment-101 ragetty Tue, 30 Jan 2007 19:59:46 +0000 http://blog.mtbguru.com/2007/01/10/uploading-trip-data-to-your-gps/#comment-101 i don't like this filtering method by GPSBabel - simply filtering over distance can mean rounding of or cutting corners. an ideal filter would retain sufficient information in (even gentle) curves and chicanes and lose detail in the straights appropriately. erasing information indiscriminantly might mean losing the ability to recognise the proper direction at forks in the trail, etc.. it can also mean losing vertical detail in the route. TrailRunner for the Mac does an excellent job here, retaining both vertical detail and differentiating between cureves, corners and straights. i don’t like this filtering method by GPSBabel – simply filtering over distance can mean rounding of or cutting corners. an ideal filter would retain sufficient information in (even gentle) curves and chicanes and lose detail in the straights appropriately.

erasing information indiscriminantly might mean losing the ability to recognise the proper direction at forks in the trail, etc.. it can also mean losing vertical detail in the route.

TrailRunner for the Mac does an excellent job here, retaining both vertical detail and differentiating between cureves, corners and straights.

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