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  • Is there a way of preventing the SurfaceDraper from creating a surface model unless it receives at least one DrapeFeature

This is my workspace, it adds elevation to lake polygons and river lines from a DEM. Lakes are calculated by clipping the raster and getting median elevation, meanwhile river lines are draped onto a surface.

 

Most of the time my data does not contain any lines, but the SurfaceDraper still creates a surface, which can take a while - is there a way to improve performance by preventing the SurfaceDraper from doing anything unless it receives at least one DrapeFeature?screenshot

@btl​  You need to link the two pipelines in some way and the add a Tester to block the DEM.

  • VariableSetter & VariableRetreiver can be used to link pipelines. Proved you can control the order of the inputs (make sure your line reader is the first reader in the navigator)
  • There is a NoFeatureTester on the FME HUB. If there are no features, then a single feature is output on the No Input port . Use the NoFeatureTester on the lines. Join the NoInput to your DEM (FeatureJoiner) and then if the join fails, don't pass those features.

Something like that...

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