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Space Delimited XYZ file Extents

  • May 2, 2017
  • 3 replies
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A
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Hi, I have a large number of space delimited XYZ files (*.xyz) and I would like to find a way to determine the extent of the files.

I don't want the minimum bounding rectangle, but the actual boundary as it would be if I were to join all the outer points of the file together.

I thought about buffering every point in the file, then dissolving the resultant buffers, but that is very time consuming so I would like to find an alternative method if possible.

Thanks,

Best answer by david_r

Have you looked at the HullAccumulator and/or HullReplacer?

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3 replies

david_r
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  • david_rCelebrity
  • Best Answer
  • May 2, 2017

Have you looked at the HullAccumulator and/or HullReplacer?

A
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  • aquamarine
  • Author
  • May 2, 2017

Have you looked at the HullAccumulator and/or HullReplacer?

Thank you David! I had no idea these transformers existed, they are exactly what I need.

 

 

 

A
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  • aquamarine
  • Author
  • May 2, 2017

I now using the HullAccumulator in Concave mode.

I can't use the Convex mode because this mode does not define the geometry of the boundary correctly (it is joining points up that are nowhere near each other).

I have tried a value of 4 for the Alpha parameter in Concave mode, but the workflow is now taking too long to run. I really have no idea what sort of value I should be putting in for the Alpha parameter.... If it helps at all the points I am trying to create an extent of are at a 0.2m resolution.

Any suggestions on reasonable Alpha values to try?

Thanks,

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