3D NDVI point cloud

[Zor]

Hi everyone,

The flight with the drone and multispectral camera (Micasense RE P) was conducted. From what we have gathered so far, Pix 4D produces point clouds in 6 separate bands (red, green, blue, RE, NIR, pan) and when loaded individually are in grey scale. It would be even better if the merged point cloud could be loaded as RGB for better visualization when classifying the point clouds into trees/terrain. Is it possible by using CloudCompare to generate a point cloud that has all the bands i.e. R,G,B,NIR,RE and Pan by combining the individual ones?

Thank you in advance,
Zoran

[daniel]

Hi, I guess it depends on the file format used, but CC can load both RGB information, and all the others bands as 'scalar fields' (and as many as you want).

In terms of visualisation, you can show only RGB, or only a particular scalar field (with a custom color ramp). And you can mix a scalar field with RGB information (see https://www.cloudcompare.org/doc/wiki/i ... ert_to_RGB), but warning, that will overwrite the RGB colors.

[Zor]

Hi Daniel,

Thanks for helping.

I imported 3 point clouds (R, G and B bands) and tried to do the step you suggested but the option Convert to RGB is greyed - any idea why is that so and what to do in order to enable it?
Here is the screnshot
https://ibb.co/ZSyTds5

I tried with point clouds in .xyz and .las but the outcome is the same.

Thank you in advance.

Zoran

[daniel]

How are the R, G and B bands coded in your file? Because if it's between 0 and 255 or between 0 and 1, you can assign each of them directly to a color component.

Otherwise, do you have an example file that you can share with us? (admin[at]cloudcompare.org)