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--- dev:desktop_ext:point_cloud_change_detection [2021/04/15 13:53]
paulien [Point Cloud Change Detection]
+++ dev:desktop_ext:point_cloud_change_detection [2023/06/27 15:20]
karen [Parameters: Algorithm]
@@ Line 1: / Line 1: @@
 ====== Point Cloud Change Detection ======
-FIXME
 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 =====
-Two point cloud datasets can be compared
+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.
-The results are two opc files: one with the added points and one with the removed points. Two vector files
+Point cloud change detection project files are stored in the same location as the source point cloud.
 ===== Source =====
-Every pointcloud from the datasetlist can be selected in the source dropdown list.
+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 =====
-==== Algorithm ====
+Generic concepts, see [[dev:desktop:preferences:detectors|]]
+===== Parameters: Output =====
-=== Voxel Size ===
+=== Voxel Result ===
-The selected area is divided in voxels. For every voxel, the change detection will be applied on how many points are added or removed.
+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
-=== Voxels Change Pts Min ===
+Depending on the chosen output parameters, the following results are available:
-The minimum number of points that should be added or removed in a voxel voxel in order to add the voxel and the points to the result datasets.
+=== Cluster Results ===
-=== Voxels Context Min ===
+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
-The minimum number of voxels that should be around a voxel in order to consider the voxel. This to exclude isolated voxels.
-==== Output ====
+=== Create Added OPC and Removed OPC ===
-T
+The results are two opc and ops files:
+  * The added points in the compared pointcloud
+  * The removed points in the compared pointcloud
-===== Results =====
-A vector file

Last modified:: 2023/06/27 15:21