Bug report: overall ascend/descend value is wrong

[routeconverter]

Please check attached track, RouteConverter shows in this track the overall ascend/descend are 2370 and 2416, but the two values are too big. In another track web the two value are 1047 and 1090. From my experience of hiking, I know the values should be about 1000.

Let me explain the difference between the values: RouteConverter just naively sums up positive and negative deltas between positions. You can watch this if you make the Ascend and Descend column visible. This gives the values 2370 and 2416 you are observing.

These values differ from reality for two reasons:

• the tracked positions of your track are value close to each other
  
• consumer GPS devices aren't that accurate and produce a lot of noise, i.e. different latitude/longitude/elevation values for the same position
  

You can see these two effects like this:

• If you choose Complete->Elevation for all positions and use date from the NASA SRTM3 project instead, the Ascend/Descend decreases to 1636/1676.
  
• If you choose Position/Delete Duplicate Positions.../Select redundant positions/20m threshold and 'Delete selected positions' the Ascend/Descend decreases to 1290/1330
  

I hope this explanation helps?