Azimuth

[BrunaGarcia]

Hi,
I have a .csv cloud that has azimuth values in it, but I'm only have the fields: X,Y,Z,scalar field,RGB colors and Normals to apply to the cloud.
It's possible to implement that or maybe it's already implemented and I just...did not see?

Thanks!

Bruna.

[daniel]

How do you define Azimuth values? What is the conversion between them and X, Y, Z?

[BrunaGarcia]

I really don't know how they acquired the data, because the file I have comes from a point cloud that I found on internet.
It seems to me to give a point fixed on the plane XY and the header says "azimuth". Its like the data were acquired and described in a polar coordinate (?).
If I could only give this information to cloudcompare, it means that CC will already know that this point describes a point on the plane XY, where I think Y's axe direction represents the North and X's axe direction represents the East direction.

[daniel]

When you load the cloud with only the X and Y coordinates (you can disable the last column) do you see a flat cloud that looks ok?

Because what bugs me is that spherical coordinates are generally (rho, theta, azimuth) (where rho is the distance to the point and theta another angle).

[BrunaGarcia]

I don't know if I'm thinking well, but..well, you have a XYZ position in space corresponding a position related to the gravitational center of the scanner. What I undestood is that this azimuth will keep XYZ coordinates but will positioning this related to the North and the East. Is like when you reconstruct a point cloud and then you make a transformation to fit the strike and the dip of a rock/cliff.

[daniel]

Yes but you can't represent a 3D point with only two values (apart if you know that they are all aligned on a plane, or a sphere, etc.).

Therefore if you have an 'azimuth' value, you need at least another angle and probably a range. All I need is to know what your (3?) coordinates are and how you convert them to a 3D Cartesian point.

[BrunaGarcia]

Yes, you're right...
I'll search if there is something more in data.
Thank you, Daniel!