Note: although 3DForest has its own ground classification filter, I found it better to perform the ground / non-ground classification using alternative software like PDAL.
To use 3DForest to segment individual trees, the following steps can be done:
- Start up 3DForest. Select Project | New Project to create a new project.
The 3DForest application appears.
- In the menu, choose Project | Import | Import Terrain Cloud to load in a LAS file of only ground points.
- In the dialog box that pops up, choose a ground class only LAS file, e.g. sample_ground.las.
The LAS file is converted into a PCD format file and displayed.
- Next, choose Project | Import Vegetation Cloud. Choose a non-ground class only LAS file, e.g. sample_vegetation.las.
The non-ground class LAS file is converted into PCD format and displayed.
- In the menu, select Vegetation | Automatic Segmentation to run the individual tree segmentation algorithm.
The Automatic Segmentation dialog box appears.
- In the Input Vegetation Cloud combo box, choose the newly loaded sample_vegetation LAS file.
- In the Input Terrain Cloud combo box, choose the loaded sample_ground LAS file.
- If necessary, change the parameters, e.g. Prefix of Clouds value from ID to TreeID. Click OK.
The individual trees are segmented into individual point clouds.
- If required, select Project | Export | Export Clouds to export the segmented trees to text or PLY formatted files.
A question: How can I create the Vegetation Cloud / DSM? Do you have a guide for this topic or can you tell me the steps to be taken? Just found your guide for creating a DTM (Create a bare earth DTM from a classified LiDAR LAS file with SAGA GIS). Thank you four your awesome guides!
ReplyDeleteGreetings from Germany
Clara
Hi Clara from Germany, you can use SAGA-GIS or PDAL or other commercial software to generate a DSM instead of passing in only ground points to the gridding algorithm; just input all the Lidar points or just the first returns as some people do.
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