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  1. #1
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    Combined tracks in topofusion and garmin breaks it up again

    I got a garmin etrex and then topofusion. I downloaded all my tracks off the GPS and then played around by combining some of them in topofusion and now I want to share theses tracks, as edited.

    I think, based on a couple of uploads of edited tracks, that any gpx file that is a combination of more than one original track is going to upload to garmin basecamp and my garmin etrex as multiple tracks.

    I haven't tried that hard to figure this out, I could be doing things wrong.

  2. #2
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    Are you sure you merged the tracks when you edited them?

  3. #3
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    I guess I didn't know how to merge tracks. I think it works now.

    Thank you self.

    Quote Originally Posted by Gilarider View Post
    Are you sure you merged the tracks when you edited them?

  4. #4
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    Not so fast.

    It works on some tracks, but when I merge others it creates crazy straight line connecters between parts of the track. When I cut those connecting lines it breaks the merged track up into separate tracks again.

    I tried to reverse the direction of the tracks and that doesn't fix it. I think the problem might be that I am trying to combine out and back tracks with one-way tracks.

    Any ideas?

  5. #5
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    I think you may be missing the way the merge function works. I use it regularly and have no problems.

    Use it for splicing sections of tracks together. What this means, is that the end of your first track must be right next to the beginning of the next. Otherwise, the program will make the connection, anyway, and it will draw a long straight line connecting those points regardless of where they are.

    The way I use the tool:

    I frequently ride with a Garmin Oregon 450. I use it on 1sec recording intervals, which results in a lot of points. The active log has a maximum capacity of 10,000 points. When it reaches capacity, it dumps about 2,000 points' worth of my track (the oldest 2,000 points) into the archive. If I am out for, say, a 6 hour ride, I get the active log plus a bunch of archived files. To have a continuous ride, I have to piece them together. I use the merge track tool, clicking the segments in order from oldest to newest, to piece them together in the correct order. When done, I right click and "Save As..." to keep the merged track.

    Here is a recent example. I had one auto archived segment from early in the ride. My wife got sick and I had to escort her back to the trailhead. She took a nap and I finished my ride.

    Here is the first part of the ride, that was the archived file.
    Combined tracks in topofusion and garmin breaks it up again-westwood1.png

    Here is the rest of the ride. The active log.
    Combined tracks in topofusion and garmin breaks it up again-westwood2.jpg

    Here are the two pieces merged with the merge tool, also with photos added using Photofusion.
    Combined tracks in topofusion and garmin breaks it up again-westwood3.jpg

    It almost sounds to me like you should be using the "Make Network" tool for what you are doing. You are trying to combine multiple tracks from different rides into a single file, correct? You need to keep in mind that using this tool will not give you files that you can use on a GPS as-is. Yes, they will be .gpx (or whatever file type you save them as), but your GPS will not interpret them the way you intend. It will break them up into segments, only one of which can be displayed at once. Royal PITA. To view the file, you have to take the additional step of turning it into a basemap for the GPS using GPX2IMG and if your GPS does not support basemaps, won't do you much good, anyway.

    I made it a habit of saving as .kml when using the "Make Network" tool so I wouldn't absentmindedly just dump the .gpx onto the GPS. Unless I was making a basemap out of it as a goal. If that was the case, I'd go through all the steps to make the basemap.

    Here's an example of using Network Analysis and GPX2IMG.

    Here's a few tracks from this season at a particular park. There are over 50,000 points in these files combined, so running the tool takes a little while.

    Combined tracks in topofusion and garmin breaks it up again-bcsp1.jpg

    You have to play with the sliders to get the desired output, but you can see how the tool simplifies things and creates intersections where it feels there should be intersections based on your tracks. You may need to manually edit the file further to cut out extraneous stuff.

    Combined tracks in topofusion and garmin breaks it up again-bcsp2.jpg

    And then, insert this file into gpx2img for conversion. The waypoint icons show up for me as airports by default, so I had to change them. The resulting file can be viewed in Basecamp or Mapsource and loaded as a transparent map layer on a mapping GPS so you can see topos or street maps underneath (whatever you choose to load in addition, if anything).

    Combined tracks in topofusion and garmin breaks it up again-gpx2img.png

  6. #6
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    Hey Nate- thanks for the explanation on merge tracks. I've used the TF "make network" tool and GPX2IMG to make a transparent map of a park I ride at and it's pretty slick.

  7. #7
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    Yes, thanks Natehawk. I didn't reply because I got confused and then a little distracted, but you answered my question once I figured out what it was.

    Basically, I can't always merge an out and back track with something else and have it load onto a device without showing up as more than one track. That's fine, I will just deal with it.

    I was confused for a minute because I have Topofusion basic and it doesn't have the make network tool. I didn't know to mention that at first.

    But, it seems like the make network tool wouldn't solve my problem anyway per Natehawk's post. I will just try and remember to save tracks as one-ways from now on and I think I will be able to merge them just fine.

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