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3DFin / 3DFin

3D Forest INventory
GNU General Public License v3.0
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With or without grond? #78

Open fguerra06 opened 2 weeks ago

fguerra06 commented 2 weeks ago

Hello,

I'm trying to use 3DFin in Cloucompare. My ground is already classified and I have à scalar field with the height.

I've got 2 questions :

Is it mandatory to normalize the cloud? By "normalize" I mean to set height scalard field to Z coordinate to get a flat ground.

Is it better to provide a cloud with ground points to 3Dfin or to remove them ?

Thank you.

Fabien

fguerra06 commented 2 days ago

Hello! Nobody for an answer :) ? Thank you.

Fabien

Diegolainor commented 1 day ago

Hi @fguerra06,

Thank you for opening this issue, and I’m glad to hear you’re using 3DFin! I hope I can clarify your questions about point cloud normalization in the software.

"Is it mandatory to normalize the cloud?" No, in your case, where you already have a scalar field with normalized heights (Z0) from previous computations, it is not necessary to normalize the point cloud again or set the Z0 values as the Z coordinate.

In the first tab of the program, you can uncheck the "Normalize point cloud" option: image

Once unchecked, you can select the scalar field that contains the normalized height values: image

"Is it better to provide a cloud with ground points to 3DFin or to remove them?" If you provide normalized heights, it may be advisable to remove ground points to reduce the number of points and, consequently, the computational load. However, if normalized heights are not provided, the ground points must be included. This allows 3DFin to generate a DTM and compute normalized heights based on it.

I hope this addresses your questions! Feel free to reach out if you have more, and apologies for the late reply.

Best regards, Diego