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I am trying to automatically find Ditches and break lines from a point cloud of a rural but flat area.

So far I tried to covert LAS to DEM and generate 'streams' using Flow direction, Flow accumulation and Stream order. Then i converted the stream order to vector. The output stream vector was poor as compared to manual digitizing.

I also tried to use GRASS tool r.geomorphon on the DEM and the output clearly shows Ditches. I tried to convert the output to vector based on the geomorphological classes but the output required deep cleaning as the classes are assigned per pixel. is there a way to create lines from such a raster excluding the pixels that do not form a line?

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Is there any other tool to extract ditches and break lines that requires less manual work?

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  • Have you searched this forum yet? Just type "extract ditches" and there are several lengthy Q&A.
    – Hornbydd
    Jul 14 '21 at 9:21

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