Cropping 3D LAS file

Hello,

I'm working with a very large LAS file and because of its size I need to crop him to process piece by piece.

When i try to load him as 3D without cropping I get this:

I've tried using a bunch of LAS packages but can't seem to find any useful tool for that.

I've developed a 2D cropping tool for my previous project but I'm having trouble using it on 3D files..

Is there a way to crop LAS files effectivley, if so please let me know i'm desperate!

Thanks.

Answer 1

[Walter Roberson]

%assuming cropping to a cuboid aligned with the axes

%Min_x, Max_x, Min_y, Max_y, Min_z, Max_z should be set appropriately

loc = ptCloud.Location;
x = loc(:,1);
y = loc(:,2);
z = loc(:,3);
mask = Min_x <= x & x <= Max_x & Min_y <= y & y <= Max_y & Min_z <= z & z <= Max_z;
cropped_points = loc(mask,:);
cropped_color = colorData(mask,:);
cropped_ptCloud = pointCloud(cropped_points, 'Color', cropped_color);

[stav marzuk]

Thank you for the answer!

Do you know if there's a way to use the function drawpolygon to trim LAS files?

Also, is there a way to see the LAS file i uploaded (in the picture above) properly?

it's all white and i can't see the z values either.

Any help is really appreciated.