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Attackpoint - performance and training tools for orienteering athletes

Discussion: Editing GPX file

in: Orienteering; General

Mar 21, 2013 4:30 PM # 

Is there any way of cutting down a GPX file. I have just started using a cheap screenless GPS logger. It takes a while to get satellites, so I have to start it early to make sure it gets my orienteering session from the start. Because of this, I end up with quite a bit of unneeded GPS track at the start. Is there some software that can be used to cut down the file?

Mar 21, 2013 4:50 PM # 
If your logger is playing nice, any XML editor ought to do the trick. I use the free firstobject editor. Only downside is that it sometimes saves things as a .gpx.xml file instead of a .gpx. It's one of the first hits for 'free xml editor' - and there are plenty of options, so keep poking around if you're not satisfied.
Mar 21, 2013 4:57 PM # 
Have you tried QuickRoute? I think it can trim tracks?
Mar 21, 2013 5:26 PM # 
@ Guskov, Thanks, the scissor tool allows you to crop before or after a selected point.

Mar 21, 2013 5:32 PM # 
If you open the gpx using a text editor (something really basic like Notepad or Wordpad---don't use Word), it has a bunch of boilerplate stuff then:
<trkpt lat="39.16850863" lon="-84.56444635">
then continues with a gazillion <trkpt>data</trkpt> entries,
and it finishes with </trkseg></trk>

Just carefully delete the appropriate <trkpt>data</trkpt> entries, remembering that the times are Z-times.

Sometimes this is easier than using more advanced tools.
Mar 21, 2013 6:29 PM # 
If in addition to your logger you are also running with a HR-only watch that downloads, you can upload both sets of files to Attackpoint at the same time, and AP will automatically merge them and cut out the unused parts of the GPX file for you based on the start/stop times on the watch.

I've used this with Polar+gpx and FR60+gpx, it should also work with Suunto data. You need to have the time on the watch set reasonably accurately.
Mar 22, 2013 3:02 PM # 
Try - still in development (and a little bit mysterious because of that) but pretty easy to use once you figure out to right click. You can also plan routes for cycling etc and it'll fit routes to the right tracks
Mar 22, 2013 11:34 PM # 
I'll be using quickroute to do my editing, it's straight forward and easy for me.

I'm actually using a myLogger and a Garmin Forerunner 610 that has gone corrupt and won't save any data, but works "live" fine. I'm going to send it back, but I kind of need a courtesy watch for the 10-14 days they say it takes to send me back a new one...
Apr 3, 2013 6:23 AM # 
For many years I have used GPS Utility. Free trial then just US$60. I voluntarily paid a 2nd fee last year as I reckoned I had been getting more than my $ worth.

Although OCAD and other softwares allow editing of tracks etc I find using GPSU up front is usually far easier. And it can convert so many formats.
Apr 3, 2013 6:51 AM # 
From time to time for my GPX editing needs I use this free utility

Downloads from Sourceforge

It may be not so polished but does the job very well.
Apr 3, 2013 7:06 AM # 
After getting satellites you can turn it off. And then on again ~minute before start. It should remember fix and make hot/warm start. Makes trimming easy or unnecessary.

This discussion thread is closed.