HT1 - Load, visualize, crop and export a T-Lidar point cloud

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This tutorial uses the following script in the Computree HowTo subfolder: HT1_Load_Crop_Export_Cloud.xsct2

Objective

This tutorial shows how to:

  1. Load a .xyb point cloud : sample_cloud.xyb (located in the HowTo folder)
  2. Display the point cloud in the step manager, the model manager and in a 3D view
  3. Extract a circular or rectangular plot
  4. Export data as file

Load a ploint cloud

This platform operates in steps that are displayed in the StepManager window. To open a file, you must add a new step. Use the button and select the .xyb file.

To actually begin charging the file, press the button.

When a step execution is completed, the progressing bar is full and the result can be diplayed by activating the Result checkbox in the Step manager window :

You may notice that subresults are created as well in the Model manager :

Display the point cloud

To view a particular element, activate the corresponding checkbox in the Model manager window. To display scan points in the 3D view, check the Scene box.

N.B. : Use the button to ajust camera view to visible elements.

In the 3D view, you can manually adjust view using the left click button (rotation), the right click button (translation) and the scroll wheel (zoom).

Exemple for another perspective :

The points intensity can also be displayed. In order to do that, use the button that gives access to the Configure colors window :

Click on the Apply button to display intensity :

You may also manually change the color ramp. See Views functionality documentation for further information.

Plot extraction

There are different possibilities in order to extract a portion of the point cloud.

The HT1_Load_Crop_Export_Cloud.xsct2 script uses two of these methods :

The OE_StepExtractPlot tool takes as parameters :

All azimuth values are specified in gradian: North = 0 or 400, East = 100, South = 200, West = 300

The TK_StepExtractBox tool takes as parameters :

It is also possible to extract a point cloud from a cylinder or a sphere. (toolkit / Exctract Sub-Cloud / )

Save point cloud to file

The button enables you to export a point cloud to a specified format.


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