Hi Guido, I do not understand why the elevation filter "Interpolate Elevation Data" with setting "coars" does not fit your need. The used spline interpolation is much more natural than a linear interpolation.
But either linear or spline interpolation will not provide good results if your input data is faulty. Especially along steep walls a few meters deviation in the horizontal plain can result in a significant difference of the elevation. In that case you have to reduce points to a minimum. And fine tune the position to a better fit. Oliver Am Montag, 24. Juli 2017, 19:52:27 CEST schrieb Guido Scholz: > Dear developers, > I like to request a new feature to improve elevation profile editing for > planned routes. As mentioned in my earlier request today DEM elevation > data shows a wobbling effect if available only in low resolution for > mountainous areas. In certain regions of the earth, like southamerica, > currently it is a pretty standard to have for example only 90 m > resolution. But also 40 m resolution can lead to this wobbling effect in > mountainous regions like the Andes. > > For planning routes this is not just a cosmetic issue but results in > significant error for summing up the elevation gain for one trip. As I > found planning my last years trip to Peru the error can easily sum up to > 50 % or even much more. This is caused by the continuous up an down while > in reality the road may have a countinuous inclination. Ofcourse the > situation did not improve for my this years planning ;-). > > To ease planning I like to have a new feature in the "filter" section > under the topic "Change elevation of track points". There currently are > some options available but these are unsufficient regarding the > described usecase. > > My proposal is to add a new linear interpolation option to take the > start and the end of a marked range and do a straight away linear > interpolation between these two points. So for planning a user could > for example start the marked range at a point in the valley and end at a > pass. The resulting error will be significantly lower than the DEM-only > solution (even if smoothing is applied). > > Guido ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Qlandkartegt-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/qlandkartegt-users
