|Posts: 1Joined: 11 Feb 2008, 14:17
Just uploaded two tracks in gpx format but in both instances accum height showing is incorrect according to the data downloaded from my gps into Gartrip. In one case I have 900 meters ascent but wikiloc only shows 2238+ feet. Both are loops so surely the accum height up and down should be the same. (2238 up and 2756 down). I used a Garmin Etrex in both cases. Track is initially downloaded as a .t file and then resaved to .gpx
Also, and this might be my fault there is no Time showing. previous uploads did display time.
I am open to suggestions please.
|Posts: 677Joined: 14 Dec 2010, 09:36
Heights is the most inaccurate measurements of GPS. Many times, often when there's bad reception or reception is completely lost, height information recorded is totally wrong and fluctuations are really imnportant on the final track. Thus software extracting the information of the track to show it up (be that websites, mobile or desktop software) need to run algorithms on the data to balance all that "noise" (and unreal info) to flatten the results and get a final course the closest to what was really hiked. This is why the same track will have slightly different heights on different platforms. We think we have created a quite good algorithm which usually gives good results but in some occasions (specially when it's a loop and minor differences are obvious) accum height might not be that good. We are continously working to improve this issue.
As per the time, if you have created the track manually or used special software to edit or convert (as it might have been stripped out while editing or converting) there won't be any time info. You can check that by opening your gpx track with a text editor and see if you can find the <time> tag