Fellow FME programmers. I have a large LAS and a DGN file that goes with it, is there a way to generate a clipped LAS file on the basis of a subset of features in the DGN ? I know I can overlay and view it, but I need to clip and produce a subset LAS file.
Question
Producing a clipped LAS file on the basis of features from a DGN file
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+18- Supporter
Hi @prasadkmurthy,
Looks like some of the features going into the LAS writer are not pointclouds :
"LAS writer: Failed to obtain point cloud from feature. Only features with point cloud geometry are expected" I suggest you add a Geometry Filter before the LAS writer to filter out these features.
Hope this helps.
Thanks @itay I also wanted to check what is the best way to convert selected featuretypes in the DGN file into "clipper" objects that can be fed to the Clipper transformer ? Any pointers appreciated.
I will add the Geometry filter as suggested by you.
+18- Supporter
Thanks @itay I also wanted to check what is the best way to convert selected featuretypes in the DGN file into "clipper" objects that can be fed to the Clipper transformer ? Any pointers appreciated.
I will add the Geometry filter as suggested by you.
+62- Celebrity
Thanks @itay I also wanted to check what is the best way to convert selected featuretypes in the DGN file into "clipper" objects that can be fed to the Clipper transformer ? Any pointers appreciated.
I will add the Geometry filter as suggested by you.
Inspect your data beforehand to get an idea of what it contains.
+40- Contributor
Yes, it looks like the clipper rejected 152 features. Use a GeometryFilter to make sure the dgn is areal. If they are self closing polylines you can use a GeometryCoercer to convert to areal, if it takes multiple features to create the outline, then you'll want to use an AreaBuilder, and you may need to set a Snapping Tolerance. Be advised that an AreaBuilder requires a topologically correct input (all lines are broken at intersections) and will create areal features for all potential polygons. ie a donut will have both the donut and the hole as separate features.