I have a DWG file with autocad_surfaces.
I want to export these to a line, so that I can use it in ArcGIS Pro.
How can I convert the features from surfaces to lines in an ArcGIS File Geodatabase using FME 2018?
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Well the key issue there is that a surface is a continuous area of measurements, whereas a line is a series of discrete points. So there has to be a decision on how you want to extract points from that surface, and how you want them to be joined together.
I suspect the transformer to use is the SurfaceModeller. Point the surface feature(s) into the Points/Lines input port. Then take the output from maybe the Contours output port, or the VertexPoints (and then join them together with a LineBuilder transformer).
Those methods would give you irregular lines. The other solution is to take the DEMRaster output and use a RasterCellCoercer to turn that into points. Then you have a regular DEM grid, which again you could use the LineBuilder to join up.
However, I would question why you need to turn this into lines, just to get this into a different format. As far as I know, File Geodatabase does support surface-type geometries. So there shouldn't be a need to convert the geometry type so radically, just to get the data in there (of course, if you need the data in a different geometry to carry out a different action on it, that's fine).