Doubts on supposedly georeferenced point cloud

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Klawd65
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Joined: Tue May 17, 2022 7:48 am

Doubts on supposedly georeferenced point cloud

Post by Klawd65 »

Hello everyone,
hope this is not a too newbie question. I'm evaluating a point cloud from a provider.
This point cloud should be georeferenced WGS84, these are the XYZ values I get for the global box center, when I load the cloud in CC:
Image

The question is, I expect these XYZ to be easily converted to the right LAT/LONG of the survey zone. Since I'm not able to get a valid conversion from these values, does it mean the point cloud is not correctly georeferenced? Am I misunderstanding something? Or am I not giving enough information in this post?

Thank you in advance
daniel
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Re: Doubts on supposedly georeferenced point cloud

Post by daniel »

Hi,

here it looks like your cloud is indeed probably in the WGS84 World Geodetic System. But with metric units (i.e. a 'projected coordinate system', probably UTM).

If you were expecting LAT/LON coordinates, you would need a different projection (or even no projection at all).
Daniel, CloudCompare admin
daniel
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Re: Doubts on supposedly georeferenced point cloud

Post by daniel »

And mind that CloudCompare can only properly manage and display clouds with a projective coordinate system ;)
Daniel, CloudCompare admin
Pointdump
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Joined: Tue Apr 27, 2021 12:53 pm

Re: Doubts on supposedly georeferenced point cloud

Post by Pointdump »

Hi @Klawd65,
I use LASInfo in LASTools to read the header of a LAS or LAZ file.
Dave
Pointdump
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Re: Doubts on supposedly georeferenced point cloud

Post by Pointdump »

Forgot to add that the header of most LAS and LAZ files contains not only Coordinate System information, but also metadata about returns, histogram of classifications, scale, etc.
DA523
Posts: 147
Joined: Mon May 25, 2020 4:02 pm

Re: Doubts on supposedly georeferenced point cloud

Post by DA523 »

try to save as CSV not bin
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