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Question

Create groundlevel polygon (including height) from las file

  • October 23, 2018
  • 1 reply
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stefanh
Contributor
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I need to create a groundlevel polygon from a las file, including the height. No classification is added to the pointcloud.

It doesn't need to be precise; otherwise there would be generate to many polygons. A generalisation would be perfect.

For example I get a polygon where the height is between 17 and 17.50 meter; and another polygon where the height is between 17.50 and 18 meter

I tried serveral thing with surfacemodeller, surfacebuilder, creating buffers around the points. But I can't get my hands around this issue.

Hope someone as experience with such an analysis

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1 reply

nathanatsafe
Safer
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  • nathanatsafeSafer
  • Safer
  • 284 replies
  • October 23, 2018

Hi @stefanh,

Have you tried the PointCloudFilter? You can chose to filter by the z component, and create an expression where it is > 17.50 and < 18 meters. Following this you could use a HullReplacer to create a very generalized polygon. Alternatively, using a PointCloudCoercer before the HullReplacer would allow you to create more precise areas out of your points.

Hope this helps,

Nathan

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