How to edit the Orthomosaic

Video: Watch the instructional video about Mosaic Editorhere.
Important: For more information about the Mosaic Editor workflow: Mosaic Editor Workflow.


In order to edit the Orthomosaic:

1. Draw a new Region

Draw and edit as many regions as needed following:

1. On the Menu bar, click View > Mosaic Editor.
2. On the Menu bar, click Mosaic Editor > Mosaic Editing.

3. On the sidebar, in the section Regions, click Draw.

3. On the Mosaic View, left click to insert the vertices of the region, right click to draw the last vertex and close the polygon.
4. (optional) Edit the shape of the region: left click over a vertex while dragging it to the new position.

5. (optional) Change the projection selected for the region:

5.1 On the sidebar, in the section Images, select Ortho Projection or Planar projection.

  • Ortho projectionThe Ortho projection preserves distances and can be used for mosaics dedicated to measurement applications.
  • Planar projection: The planar projection does not preserve distances, but has less distortions than the Ortho projection on sharp transitions such as building edges. Therefore it is not recommended to use planar images for mosaics dedicated to measurement applications. Its basic use is to improve the visual aspect of the Orthomosaic.

5.2. Select an image in Planar Projection or select one or multiple images in Ortho Projection. If multiple images are selected, they will be blended together.

It is possible to undo the changes:

    • Reset the displayed Mosaic. The last saved and exported Edited Mosaic will be displayed. 
Note: To refresh the displayed Mosaic it is needed to aggressively zoom in/out or close and open the project again.
    • Reset the displayed Mosaic by using the DSM and Orthomosaic outputs filesOn the sidebar, in the section Export, click Reset.
Note: The Reset option does not reset the drawn regions.


2. Save the changes

1. On the sidebar, in the section Export, click Save.

Note: After saving the drawn regions can be deleted without affecting the saved edits. The edits will be lost only if the project is closed.


3. Export the saved Edited Mosaic into new outputs

1. On the sidebar, in the section Export, click Export.

  • Ensure that all changes to be exported are saved.
  • Exporting the Edited Mosaic will overwrite all the mosaics generated at step 3.
  • The Grid DSM as well as the different orthomosaic formats (GeoTIFF, Google Maps Tiles, etc.) will be regenerated if selected in the processing options.


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Article feedback (for troubleshooting, post here)


  • Susan Myers

    Is it possible to snap to existing region vertices when creating regions?  The vertices of existing regions highlight with a yellow circle when hovering above them, but although I might click at that yellow point, zooming in to inspect - the new vertex does not snap to the highlighted vertex.  Is there a way to snap to it?

  • Beata (Pix4D)

    Hello Susan,

    Unfortunately, it is not possible to snap the vertices in the Mosaic Editor. However, I'll share your suggestion with our team to consider adding this feature in the future.


  • Adam Barbe

    Hi there, I'm new to this.  

    My Ortho image has this strange color for one of the tiles.  Can I redo just a few images that make up a single tile?  See screenshot. 

    Edited by Adam Barbe
  • Daniel (Pix4D)

    Hi Adam,

    That is very weird.

    I am afraid that It is not possible to process just a few images, Step3 has to be run again.

    You could use a processing area and process a part of the project only but the previous ortho would be overwritten.

    I wonder why that is happening, how do the original images look like?

    If you go to Contact Support and open a ticket, we could try to find the reason for the failure.

    Thank you very much.

    Edited by Daniel (Pix4D)
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