How to create the orthomosaic of a facade

 
 
Video: Watch the instructional video related to the Orthoplane:
 
Important:
  • An orthoplane can be drawn after step 1. Initial Processing has been completed.
  • An orthomosaic of a facade (or orthofacade) can only be generated after step 2. Point Cloud and Mesh has been completed.

In order to draw a new orthoplane in the rayCloud:

1. On the menu bar, click View > rayCloud.
2. On the menu bar, click rayCloud > New Orthoplane.

3. In the 3D View, an orthoplane box appears beside the mouse. Left-click to place the box on a 3D point.
4. Adjust the orthoplane box so that it is parallel to the object (the facade of a building, the slope of a hill, etc.):

 
Warning: The green arrow should point towards the object to be orthorectified.
  • Drag the arrows of the orthoplane box to move it and place it at the desired location. Drag the:
    • Red arrow to move it towards the X direction.
    • Green arrow to move it towards the Y direction.
    • Blue arrow to move it towards the Z direction. 

Or use the Position (X,Y,Z) options of the right sidebar: Menu View > rayCloud > Right sidebar > Objects.

  • Drag the spheres of the orthoplane box to resize it. Drag the:
    • Red sphere to resize the X length.
    • Green sphere to resize the Y length.
    • Blue sphere to resize the Z length. 

Or use the Width, Height, Clipping Distance options of the right sidebar: Menu View > rayCloud > Right sidebar > Objects.

 
Note: All the points included in the orthoplane box are used for the orthomosaic generation.

5. (optional) Click Flip to change the orientation and direction of the orthoplane.
6. (optional) If at least one surface object is drawn (How to draw a Surface in the rayCloud), click Align to align the orthoplane with an existing surface. (Select the desired surface from the drop-down list).
7. Click Apply to save the changes made under the Properties section of the right sidebar.

orthoplane.png

In order to generate the orthomosaic of a facade:

1. Draw a New Orthoplane. For step by step instructions: How to draw a new orthoplane.

2. Set the Resolution [cm/pixel] of the orthomosaic. For more information about the orthoplane options: Menu View > rayCloud > Right sidebar > Objects.
3. (optional) Select the Generate DSM box to generate a DSM.
4. Select the file path where the orthomosaic will be stored.
5. Click Generate.

 
Note: Only one orthomosaic can be generated at a time. The generated orthomosaic is not georeferenced.
 
Important: If the generated orthomosaic is distorted with background information, improve the results by masking the background: How to remove the Background of the Orthoplane using the Annotation Tool .
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14 comments

  • Sin Yang Chop

    Hi, the generated ortomosaic is it to scale? in my experience it seems the photo is not to scale when I input it into autocad. 

    Edited by Sin Yang Chop
  • Daniel (Pix4D)

    Hello Sin,

    The ortho generated when using an orthoplane is not georeferenced but it is scaled. It has the same scale as the project.

    Regards.

  • Sin Yang Chop

    Hi Daniel, but when I import into autocad I did some quick measurement and it is not tally with the actual size.

  • Daniel (Pix4D)

    Hi again.

    Is your Pix4D project scaled? By saying that I mean if you have either GCPs or a scale constraint.

    Regards.

  • A T

    Hello,

    I was wondering if there was a way to edit the facade in mosaic editor?

  • Beata (Pix4D)

    Hello,

    No, there is no way to edit the facade in Mosaic Editor. Every change should be done prior to facade generation, for example using the Annotation Tool. More in the video above.

    Regards

  • Drone Metrix Drone Metrix

    Hello,

    I have the same problem than Sin Yang Chop.

    My project is georeferenced, but the ortoplan is not at the good scale when I open it in Global Mapper...

    Do you know where the problem could be?

    Thanks

  • Blaž (Pix4D)

    Hi Ariance,

    the orthoplane, i.e. the orthomosaic of a vertical or oblique surface, is not georeferenced. It is placed in an arbitrary coordinate system unlike the orthomosaic. However, the orthoplane should be scaled. Make sure that the .tfw file is correctly recognized in the software you are using. 

  • Robert Kay

    Good afternoon

    When creating an orthomosaic of a facade from my project the loading bar continually jams at 47% loading of the point cloud. Is this likely to be an issue with the graphics card/data set?

    My graphics card is a Quadro M2000 and has processed the large data set very slowly throughout.

    Thanks

  • Blaž (Pix4D)

    Hi Robert,

    since the process is stuck while loading the point cloud this could indicate that the computer resources are not optimal and the point cloud might be too big. 

    Could you try changing the Processing Options to generate fewer 3D Points and try it again?

  • Caleb Baildon

    Hi. Is it possible to have Pix4D tile the oblique orthomosaics or is it only a single image? Sometimes they get too large for our CAD programs to handle and it is a pain to manually break the area down in Pix4D and produce multiple orthoplanes that are on the same plane. Cheers

  • Holden (Pix4D)

    Hi Caleb. The ortho is actually created as a tiled output and then stitched together to create the whole image. You can find the files that are generated in the directory that follows "Project_folder\3_dsm_ortho\2_mosaic\tiles". Otherwise, you can cut it into specific chunks in GIS. Also, one recommendation I can make is to lower the GSD of the ortho in step 3 processing options before running. THis only minimally reduces the visual quality while drastically impacting the file size. Hope this helps

  • Caleb Baildon

    Hi Holden. I only get the tiles for nadir orthomosaics produced in Step 3, I don't get tiled images generated from Orthoplanes, such as I use for vertical surfaces like building facades. 

    Can you please confirm if Pix4D produces tiles for oblique orthomosaics generated from Orthoplanes, and what version that is in? Cheers

  • Holden (Pix4D)

    Hi Caleb. The tiles for the orthofacade are not stored locally like the regular orthomosaic. If you want to tile the orthofacade it needs to be done in another application. Feel free to provide your feedback to the developers if you would like to see this feature added to Mapper. 

    https://community.pix4d.com/c/feature-request

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