Can anyone provide a right and fast solution to this matter? Thank you!
@takashi @jdh @danatsafe @mark2atsafe
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How to use NeighborFinder when pointcloud(*.las) is Candidate?
Hi, I've a got point layer in shp format and a pointcloud file in las format and I'd like to find the nearest point in the las file for every point in shp file. I tried to use PointCloudCoercer to change las file into mutipoint, but z value of points won't be merged. Then I tried to change las file into individual points, but it was too slow, I got thousands of las files and each of them contains over 1 million points.
Best answer by erik_jan
If you have a limited amount of points in the shape file, you could buffer them using a Bufferer and then clip the pointcloud using the Clipper.
This will limit the pointcloud data to only use those points near a shape point.
Then use your approach with the PointCloudCoercer and NeighborFinder to find the exact closest point.
Hope this helps.
+17- Contributor
- Best Answer
If you have a limited amount of points in the shape file, you could buffer them using a Bufferer and then clip the pointcloud using the Clipper.
This will limit the pointcloud data to only use those points near a shape point.
Then use your approach with the PointCloudCoercer and NeighborFinder to find the exact closest point.
Hope this helps.
fmelizard wrote:
@bobo Keep in mind that the NeighborFinder returns distances in only 2D.
Yeah, the points in the shp file are 2D, I only need to find the nearest point in the las file at projection position. But since you brought it up, is there a transformer could perform like NeighborFinder in 3D?
erik_jan wrote:
If you have a limited amount of points in the shape file, you could buffer them using a Bufferer and then clip the pointcloud using the Clipper.
This will limit the pointcloud data to only use those points near a shape point.
Then use your approach with the PointCloudCoercer and NeighborFinder to find the exact closest point.
Hope this helps.
Thank you, got it work. How silly am I, I thought that Clipper can only used for vector or raster files.
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