Rotating Point Cloud on Z Axis
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Evan Carlson
Dec 29, 2022, 1:35:45 PM12/29/22
to LAStools - efficient tools for LiDAR processing
Hello, It looks like there are a few different ways to transform a point cloud on the x & y axis using las2las, but what is the best way to rotate a point cloud on the z access?
Jochen Rapidlasso
Dec 29, 2022, 4:03:49 PM12/29/22
to LAStools - efficient tools for LiDAR processing
Hi,
this is easy. We implemented the general matrix transformation since a while.
The matrix to rotate around z is
cos-a -sin-a 0
sin-a cos-a 0
0 0 1
1 1 1
sin-a cos-a 0
0 0 1
1 1 1
So if you want to turn by 33 degrees around the z axis:
33° = cos a = 0,839
33° = sin a = 0,545
0,839 -0,545 0
0,545 0,839 0
0 0 1
1 1 1
The test
las2las -i france.laz -o rotated.laz -transform_matrix 0.839,-0.545,0 0.545,0.839,0 0,0,1 1,1,1
33° = cos a = 0,839
33° = sin a = 0,545
0,839 -0,545 0
0,545 0,839 0
0 0 1
1 1 1
The test
las2las -i france.laz -o rotated.laz -transform_matrix 0.839,-0.545,0 0.545,0.839,0 0,0,1 1,1,1
shows in the hopefully soon released new GUI the rotated picture (shifted by x to avoid overlap):
Happy rotating!
Jochen @rapidlasso
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