Vectorization

Follow

PIX4Dsurvey allows you to vectorize point clouds made with PIX4Dmapper, PIX4Dmatic, laser scanners, LiDAR or other third-party tools and to assign the objects to layers. You can precisely define the position of the geometry by using original images or the vertex editor. 

GIF animation of vectorization of point clouds in Pix4Dsuvey, catenary and building

Vectorization tools in PIX4Dsurvey

The following tools are available:

  • Pix4Dsurvey_select_tool_icon.png Simple selection (default).
    • Pix4Dsurvey_rectangular_selection.png Rectangular selection
  • PIX4Dmatic_color_selection_icon.png Color selection
  • Pix4Dsurvey_polyline_icon.png Polyline.
  • Pix4Dsurvey_marker_icon.png Marker.
  • Pix4Dsurvey_polygon_icon.png Polygon.
  • Pix4Dsurvey_catenary_icon.png Catenary
  • PIX4Dsurvey_road_marking.jpg Assisted road marking

How to use vectorization tools in PIX4Dsurvey

Vectorization tools specifics:

  • Simple selection (default): Click on the object to select it. Right-click on the object to use Move to layer or Delete geometry options. 
    • Rectangular selection: Hold down Ctrl or ⌘ to freeze the screen and select the points in the point cloud, points in the Grid of Points, vector layers, or all object in the selected area.

      PIX4Dsurvey_Vector_region_select.gif

      Hold down Ctrl or ⌘ and draw the selection.

  • Color selection: Select points based on the color, a tolerance, and a radius.
  • Polyline: Minimum two points need to be clicked in the 3D view to define a polyline.
  • Marker: Click on a point in the 3D view to create a marker.
  • Polygon: Minimum three points need to be clicked in the 3D view to define a polygon.
  • Catenary: For vectorization of freely hanging power lines, chains and ropes. Minimum three points need to be clicked in the 3D view.
  • Assisted road marking: Click on two points on the line to automatically vectorize it.
    Tip: When vectorizing catenaries, the order of the clicks is not important. The mathematical line that represents the catenary curve will be calculated based on all clicked points.

To use the vectorization tools:

  1. Select the tool on the toolbar.
  2. Left-click on the point cloud in the 3D view to create the first vertex and to start the vectorization.
  3. Continue using left-click to add more vertices to the geometry.
  4. (Optional) Press the Esc key to cancel the vectorization. 
  5. To finish the geometry:
      • Either Right-click in the 3D view to add the last vertex and to finish the geometry.
      • Or press Enter to accept the edits and to finish the geometry.
  6. (Optional) Right-click again to exit the vectorization tool and to change to Pix4Dsurvey_select_tool_icon.png Simple selection (default).
 
Note: When pressing Enter the current state of the geometry will be accepted and no additional vertices will be added. To speed up the vectorization, we recommend using the right-click as it adds the last vertex as well as finishes the geometry.

Editing geometry in the 3D view

To move the vertex in the 3D view

  1. Use the Simple selection tool to click on an object.
  2. Click on the existing geometry.
  3. Click on the vertex and drag it to the new position.
     
    Tip: To speed up the editing, move to the next vertex using the Tab shortcut.

After moving the vertex to the new position, the edits are automatically taken into account and you can continue creating new geometries or edit existing ones. 

To add a vertex to existing geometry

  1. Use the Simple selection tool to click on an object.
  2. Hover over the section where you would like to add the vertex.
  3. Click to create a new vertex.

To remove a vertex from existing geometry

  1. Use the Simple selection tool to click on an object.
  2. Click on the existing geometry.
  3. Click on the vertex and press the Delete key.

To split the polyline

  1. Use the Simple selection tool to click on an object.
  2. Right-click on the vertex where you would like to split the polyline.
  3. Click Split polyline.

After the polyline is split, two separate polylines are created. The polylines share the vertex in which they were split.

To join polylines

  1. Use the Simple selection tool to click on first polyline.
  2. Hold Shift and select the second polyline.
  3. Right-click on the shared vertex and click Join polylines.

After the polylines merged, a single polyline is created.

 
Important: The Join polylines feature in available only when two polylines share a vertex.

Editing geometry on images

 
Important: Only available for perspective cameras' projects processed in PIX4Dmapper or PIX4Dmatic. For more information see How to import a PIX4Dmapper project into PIX4Dsurvey or How to import a PIX4Dmatic project into PIXDsurvey articles.

To move the vertex on the images:

  1. Use the Simple selection tool to click on an object.
  2. Click on the vertex on the image and drag it to the new position on at least two images.
  3. Click Ctrl + Enter to accept the edits.
     
    Tip: To speed up the vectorization, accept the edits by simply clicking in the 3D view or moving to the next vertex using the Tab shortcut.
  4. (Optional) Hit the Esc key to cancel the edit.

After moving the vertex to the new position on at least two images, the position of the vertex is automatically changed and updated. 

 
Note: Vertices must be marked on at least two images. For more accurate results, it is recommended to mark the same vertex in three or more images.

Editing geometry with vertex editor

It is possible to manually adjust the coordinates of created vertexes. 

Pix4Dsurvey_vertex_editor.jpg

To move the vertex using the vertex editor:

  1. Use the Simple selection tool to click on an object.
  2. Click on the vertex. The dialog Coordinates opens in the bottom left corner of the screen.
  3. Edit the coordinate values by:
    • Typing the new coordinate values.
    • Adjusting the coordinate values with the +/- button. 
  4. Click Ctrl + Enter to accept the edits.
     
    Tip: To speed up the vectorization, accept the edits by simply clicking in the 3D view.
  5. (Optional) Hit the Esc key to cancel the edit.

Was this article helpful?
4 out of 4 found this helpful

Article feedback (for troubleshooting, post here)

7 comments

  • Aaron Meyer

    I like the simplicity of adding geometry.  I'm testing it on the example dataset.  Is there a way to delete a vertex without deleting the geometry?

  • Blaž (Pix4D)

    Hi Aaron, great to hear you are trying out Pix4Dsurvey.

    To delete an individual vertex you can:

    • Use the Select tool to click on an object.
    • Click on the existing geometry.
    • Click on the vertex and press the Delete key.

    Best,

     

    Edited by Blaž (Pix4D)
  • Midwestern Consulting

    I am really enjoying this product.  Is there a way to create an arc on pavement areas and curbs?

  • Blaž (Pix4D)

    Hi, 

    At the moment, the tool that would create an arc based on a few clicked points is not implemented in Pix4Dsurvey. But the idea is interesting, and we will consider it for future releases. 

    Feel free to also check the Pix4Dsurvey Feature request post to add more suggestions. 

    Best,

  • Manuel del valle

    Hola,

    Como logro realizar que mi polígono abarque la superficie seleccionada y no sea solo en 2d.

    Saludos.

  • Blaž (Pix4D)

    Hi Manuel, 

    The polyline is defined by the 3D vertices that you click on the model. The polyline will connect the defined vertices but will not exactly follow the terrain as in the case of cross-sections. 

    Could you tell me more about why would you find it beneficial for the polyline to follow the terrain?

    Best,

  • Manuel del valle

    Hola Blaz,

    Gracias por contestar.

    Me resultara beneficioso ya que obtendría la superficie dentro del polígono, para comparar superficies de vuelos semanales  y obtener volúmenes entre superficies.

Article is closed for comments.