Problem with LiDAR Point Cloud Segmentation
Posted: Thu Jul 04, 2024 12:33 am
Hi everyone,
I am currently working on an environmental simulation model in QGIS for a university study project.
To achieve this, I need to generate spatial input data using CloudCompare to process airborne LiDAR point cloud data. Specifically, I require the Digital Elevation Model (DEM), Digital Surface Model (DSM), and Canopy Digital Surface Model (CDSM) for my study area. This involves segmenting individual objects such as trees, buildings, and the ground surface from a LiDAR 3D model provided by the federal state of Nordrhein-Westfalen.
I followed this tutorial https://youtu.be/3QigbJGuHY8?si=aJPBRCFG0-CGEPo8 from minute 04:48 to 07:00, where a LiDAR model from Australia is successfully segmented into the desired components. While I was able to replicate these steps with a similar LiDAR scan from Australia, the process does not work as smoothly with the LiDAR scan of my study area.
When I set the Active Scalar Field to Classification under Properties > Scalar Fields in CloudCompare, I primarily see two colors under SF display parameters (as shown in the attached image), whereas there should be more (as demonstrated in the video). Selecting either of these two colors results in incorrect segmentation, preventing me from accurately isolating trees or buildings from the model.
Why is this happening? Is the LiDAR scan not accurate enough? Can anyone offer assistance or suggest a better method for segmenting the model into the desired components? If someone could suggest what I should do differently, I would greatly appreciate it. Alternatively, I can provide the .laz file of the area if someone is willing to try it for me.
Thank you in advance for your help!
Best regards,
Luis
I am currently working on an environmental simulation model in QGIS for a university study project.
To achieve this, I need to generate spatial input data using CloudCompare to process airborne LiDAR point cloud data. Specifically, I require the Digital Elevation Model (DEM), Digital Surface Model (DSM), and Canopy Digital Surface Model (CDSM) for my study area. This involves segmenting individual objects such as trees, buildings, and the ground surface from a LiDAR 3D model provided by the federal state of Nordrhein-Westfalen.
I followed this tutorial https://youtu.be/3QigbJGuHY8?si=aJPBRCFG0-CGEPo8 from minute 04:48 to 07:00, where a LiDAR model from Australia is successfully segmented into the desired components. While I was able to replicate these steps with a similar LiDAR scan from Australia, the process does not work as smoothly with the LiDAR scan of my study area.
When I set the Active Scalar Field to Classification under Properties > Scalar Fields in CloudCompare, I primarily see two colors under SF display parameters (as shown in the attached image), whereas there should be more (as demonstrated in the video). Selecting either of these two colors results in incorrect segmentation, preventing me from accurately isolating trees or buildings from the model.
Why is this happening? Is the LiDAR scan not accurate enough? Can anyone offer assistance or suggest a better method for segmenting the model into the desired components? If someone could suggest what I should do differently, I would greatly appreciate it. Alternatively, I can provide the .laz file of the area if someone is willing to try it for me.
Thank you in advance for your help!
Best regards,
Luis