How to use GCPs for processing on Pix4D Cloud

Ground control points (GCPs) can be used for processing on the cloud. However, they should be marked using Pix4D Desktop beforehand.

 
Important: It is not required to process on a computer, opening the project and adding GCPs if sufficient.


1. Open the project using Pix4D Desktop:

  • Create a new project from scratch but do not start processing. For more information: 202557369.
  • Alternatively, download the project from Pix4D Cloud. For more information: 115000707003.

2. On the menu bar, click Project > GCP / MTP Manager...
3. In the window GCP/MTP Manager, click Basic Editor...
4. In the section GCP/MTP Table, select the GCP to be marked.



5. In the section Images, sort the list:

sort_by_alphabet.png By name: The images are sorted alphabetically.
sort_by_gcp.png By distance to GCP: Images closer to the GCP are listed first. This sorting can be used only if the images and GCPs are geolocated using a known coordinate system. This is the default sorting mode.
sort_by_image.png By distance to the marked image: When an image is selected and a GCP is marked on it, this option lists the images that are closer to the currently selected image. This sorting can be used only if the images are geolocated.

6. In the section Images, select the image on which the GCP should be marked. After the selection, the image is displayed in the Preview section.
7. Navigate in the image by:

  • Zoom in: Moving the mouse scroll wheel forwards.
  • Zoom out: Moving the mouse scroll wheel backwards.
  • Pan: Using the mouse left click.
  • Zoom in quickly on a specific point in the image: Point with the mouse the point and hit the Alt key. When the key is released, the view returns to the last zoom level.
  • Zoom out to preview the zero zoom level: Hit the Shift key. When the key is released, the view returns to the last zoom level.

8. Left click on the image to mark the point. If needed, remove a mark by clicking trashbin.png.



9. In the Images section, select the next image on which the GCP should be marked.

 
Note: A GCP does not need to be marked on all images in which it appears. Ideally, mark a GCP on 3 to 8 images (minimum is 2).

10. Repeat steps 6. to 9. for other GCPs.
11. Click OK.
12. On the menu bar, click Project > Save Project.
13. Upload the project from Pix4D Desktop to Pix4D Cloud. For more information: 202558589.

 

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