How to classify point clouds in PIX4Dmatic

Classify point cloud is a powerful tool to split the point cloud separating all the different elements in the point cloud into their specific class.

This article explains how to manually classify the point cloud using the standard of the American Society for Photogrammetry and Remote Sensing (ASPRS).

How to assign selected points to a class

Assigning points between different classes is especially useful when:

• The point cloud is not classified and certain points need to be assigned to classes.
• Points are not assigned to the correct point class.

To manually assign points to a class:

• Use the Selection tool to select points. These selection tools could be:
  • Rectangle selection (keyboard shortcut R)
  • Polygon selection (keyboard shortcut J)
• Right-click on selected points.
• Click to Assign to ASPRS class, to assign selected points to an ASPRS class.
  

How to show/hide individual or all classes

If the ASPRS classes option is enabled, it is possible to show or hide each class. In case one or more classes have to be displayed or hidden, this can be done individually by clicking on the display icon(). 

How to show classes in RGB

The point cloud keeps the RBG colorization even when the point cloud is classified. To see each class on RGB color, instead of the ASPRS class is necessary to disable Show class in RGB () to switch to RGB color. In the opposite way, if the option is enabled () the colorization is related to ASPRS class.

How to export all classes

Exporting a classified point cloud is the same process as a non-classified point cloud. There are two ways to do the export:

1. 1. Navigate to Processing options > Exports > Dense point cloud and click on the More  button or
   2. File > Export > Dense point cloud