Author Topic: Waypoint elevations  (Read 3448 times)

LDWhite68

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Waypoint elevations
« on: October 14, 2014, 10:53:33 AM »
I thought I had done this before, but maybe not. What I want is to use the DEM data to correct elevations of waypoints. Whenever I do "Correct elevations from DEM" on a file, it is only changing the track point elevations. I would also be satisfied to be able to convert the waypoints to track points and then do the elevations correction, but can't see a way to do that either (other than maybe writing a script outside TF to operate on the gpx file). Am I missing something here? The particular waypoints that I'm concerned with are ones that were created in TF using the Lap Analysis tool, which assigned elevations at waypoints only by linear interpolation between the track points (not good when they're far apart).

ScottMorris

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Re: Waypoint elevations
« Reply #1 on: October 14, 2014, 02:37:59 PM »
I think that's a good point that using the "Correct Elevations from DEM" should affect waypoints as well.  I will make that change.

Otherwise, Lap Analysis could/should be using DEM to assign waypoints, too.  When you create a new waypoint on the map in TF, it does get a DEM elevation.  But apparently not from Lap Analysis.  I'll try to take a look at that, too.

Thanks for the post!
Scott Morris - founder and co-author of TopoFusion
email: smorris@topofusion.com

LDWhite68

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Re: Waypoint elevations
« Reply #2 on: October 15, 2014, 09:34:35 AM »
I did manage to convert waypoints to track point by using gpsbabel. But it would be easier not to have to leave TF. Maybe someday it would even be possible to access gpsbabel functions from within TF?

ScottMorris

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Re: Waypoint elevations
« Reply #3 on: October 15, 2014, 03:43:17 PM »
Latest beta has the DEM assign function assigning elevations for waypoints now, too.

I have one 'debug' feature for a user already calling GPSBabel.  But it's so general purpose that I'm not sure what the interface would look like.  For a limited set of operations, it could be useful, though.
Scott Morris - founder and co-author of TopoFusion
email: smorris@topofusion.com