Knowledge Base
Recent Changes

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Next revision 		Previous revision
dev:desktop_ext:point_cloud_change_detection [2021/04/14 16:33]
paulien created 		dev:desktop_ext:point_cloud_change_detection [2023/06/27 15:21] (current)
karen [Parameters: Output]
Line 1: Line 1:
 ====== Point Cloud Change Detection ====== ====== Point Cloud Change Detection ======
-FIXME+
 This page describes how to use the extension "Point Cloud Change Detection"\\ This page describes how to use the extension "Point Cloud Change Detection"\\
  
-{{orbit_desktop:how_to_find.png?25&nolink  |}} [[dev:desktop:workspace:main_toolbar|Main Toolbar]] > Extensions > Point Cloud Change Detection+{{orbit_desktop:how_to_find.png?25&nolink  |}} Main Toolbar > Extract > Point Cloud Change Detection
  
-The "Point Cloud Change Detection" extension makes it possible to compare \\+The "Point Cloud Change Detection" extension makes it possible to compare 2 point clouds.\\
  
 +{{ :dev:desktop_ext:pointcloudchange214.png?nolink&800 |}}
  
 ===== Concepts ===== ===== Concepts =====
 +
 +The change between two point clouds can be analyzed by dividing the point cloud in voxels and counting the number of added and removed points within every voxel.
 +
 +Point cloud change detection project files are stored in the same location as the source point cloud. 
 +
 +
 +===== Source =====
 +
 +Use the generic workflow for [[dev:desktop_ext:generic|]] to define the source file. 
 +
 +The method for the range of interest is 'Area'. 
 +
 +
 +===== Compare Point Cloud =====
 +
 +Add the active point cloud dataset from the dataset list that will be compared with the source point cloud dataset. 
 +===== Parameters =====
 +
 +Generic concepts, see [[dev:desktop:preferences:detectors|]]
 +===== Results =====
 +
 +=== Voxel Result === 
 +
 +The change_voxels vector file includes all the voxels that have added or removed points in the change analysis. Every voxel has the attributes:
 +  * FD_PointCount1: Number of points in voxel in source point cloud
 +  * FD_PointCount2: Number of points in voxel in compared point cloud
 +  * FD_PointCloudDelta: The difference in points between the source and compared point cloud
 +  * FD_PointCloudDeltaAbsolute: The absolute difference in points between the source and compared pointcloud
 +
 +Depending on the chosen output parameters, the following results are available:
 +
 +=== Cluster Results ===
 +
 +This change_voxel_clusters vector file clusters the voxels that are within the clustering distance. Every cluster has the attributes:
 +  * Cluster size: Number of voxels in cluster
 +  * FD_AvgPointCount1: Number of points in cluster in source point cloud
 +  * FD_AvgPointCount2: Number of points in cluster in compared point cloud
 +  * FD_AvgPointCloudDelta: The difference in points between the source and compared point cloud in the cluster
 +  * FD_AvgPointCloudDeltaAbsolute: The absolute difference in points between the source and compared pointcloud in the cluster
 +
 +
 +=== Create Added OPC and Removed OPC ===
 +
 +The results are two opc and ops files: 
 +  * The added points in the compared pointcloud
 +  * The removed points in the compared pointcloud 
 +
 +
  
 
Last modified:: 2021/04/14 16:33