I'm able to drape feaures on a DTM with SurfaceModeller, but I want to have Z distance between the point (for exemple on a three) that I project and the same point projected (on the ground).
how can it be possible?
thanks
Solved
how to extract height above ground with surface modeller and drapped features
Hello,
Best answer by azeisinger
To get this, all you need to do is use the CoordinateExtractor twice on the feature.
First, use it on the feature before you manipulate it. Save the z variable to something like _AMSL
Then, use the SurfaceModeller (or draper) to drape the feature.
Then, use the CoordinateExtractor again. Be sure to rename the z variable to something different from the first time. In this case, call it _GroundLevel.
Now, create a third attribute with the AttributeCreator, called _AGL. Define it as a formula, which is _AMSL - _GroundLevel.
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+1To get this, all you need to do is use the CoordinateExtractor twice on the feature.
First, use it on the feature before you manipulate it. Save the z variable to something like _AMSL
Then, use the SurfaceModeller (or draper) to drape the feature.
Then, use the CoordinateExtractor again. Be sure to rename the z variable to something different from the first time. In this case, call it _GroundLevel.
Now, create a third attribute with the AttributeCreator, called _AGL. Define it as a formula, which is _AMSL - _GroundLevel.