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Convert minus z values to positive (without changing the number)

  • October 20, 2017
  • 8 replies
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J
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Hello,

I'd like to be able to change, for example a -544.43 meter Z value to 544.43. The z values were generated by a bathymetric software package, so positive Z is down. I realize this is a simple multiply by -1, but I can't get it to work on a .LAS file using the "Offsetter" or coordinate tools. I suspect this should be an easy fix, so any help would be appreciated.

Best answer by takashi

Hi @jimmy, the 3DAffiner might help you.

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8 replies

ebygomm
Influencer
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  • ebygommInfluencer
  • Influencer
  • 3434 replies
  • October 20, 2017

Are your geometries just points?

takashi
Celebrity
  • takashiCelebrity
  • 7843 replies
  • Best Answer
  • October 20, 2017

Hi @jimmy, the 3DAffiner might help you.

Why not inspect features with Visual/Data Preview and Feature/Record Information before writing them into a destination dataset?
nielsgerrits
VIP
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  • nielsgerritsVIP
  • 2940 replies
  • October 20, 2017

Hi @jimmy, the 3DAffiner might help you.

Learned something new today!
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J
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  • jimmy
  • Author
  • 9 replies
  • October 20, 2017

Hi Takashi,

Thanks!!! That worked perfectly. I hadn't thought of using the 3dAffiner. Exactly what I was looking for! Yes, the geometries are all points, so inputting a LAS and outputting a LAS worked. I very much appreciate the help!

ebygomm
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  • ebygommInfluencer
  • Influencer
  • 3434 replies
  • October 20, 2017

A coordinate replace should also work for point values

J
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  • jimmy
  • Author
  • 9 replies
  • October 20, 2017

A coordinate replace should also work for point values

This was one of the tests I did and it did not work. It's possible I was not implimenting it correcctly. Thanks!

 

 

takashi
Celebrity
  • takashiCelebrity
  • 7843 replies
  • October 20, 2017
This was one of the tests I did and it did not work. It's possible I was not implimenting it correcctly. Thanks!

 

 

This works for point geometries, but probably your input feature has a point cloud geometry. If so, this could work once you have decomposed the point cloud into individual points with the PointCloudCoercer (Output Geometry: Individual Points). You can re-build a point cloud from the individual points with a PointCloudCombiner after replacing z-coordinate.

 

Why not inspect features with Visual/Data Preview and Feature/Record Information before writing them into a destination dataset?
takashi
Celebrity
  • takashiCelebrity
  • 7843 replies
  • October 20, 2017

Hi @jimmy, the 3DAffiner might help you.

The Scaler works as well.

 

Why not inspect features with Visual/Data Preview and Feature/Record Information before writing them into a destination dataset?

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