Land - wrong altitude is used in equations if some trackpoints don't have altitude values
I have a tcx file, which is missing some altitude values in the beginng, but after a while, those are added to the following trackpoints.
Land is giving the trackpoints with missing altitude values the altitude value of "-1" and is using this values in calculating different values like Altitude Diff. Departure-Arrival;ascent;Distance with altitudes;Mean moving speed ... instead of skipping this placeholder.
I know I can circumvent this problem by asking Land to recalculate the altitude value for each point on the base of a cdem file but this is not the point.
If the file actually includes de -1 data, it seems normal that Land reads it, as negative altitudes can be present in some parts of the world. So it is not ignoring the "-1".
But maybe the file doesn't include "-1" but some other value which is read by Land as a "-1". In that case, we could evaulate this behaviour and try to find a solution. Could please provide this track?
As you say, you could calculate altitudes by a CDEM, but then you would lose the correct altitude data from the other points. An option would be to split the track in 2 (right click on the point and 'Tools > Cut track here'). Then you can work with the tracks separately (add altitudes from CDEM in one of them), and finally unify again the tracks ('Menu > Edit > Unify tracks').
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