How to add / import GCPs using the Basic GCP/MTP Editor

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This article explains how to add and import ground control points (GCPs) when using the Basic GCP/MTP Editor. 

Important:
  • These step-by-step instructions are part of the procedure of how to include GCPs in the project. For more information about how to include GCPs in the project: How to include GCPs in the project.
  • All GCPs must have the same coordinate system.

1. On the Menu bar, click Project > GCP / MTP Manager...

PIX4Dmapper GCP MTP Manager

       Select GCP/MTP Manager....

2. In the GCP/MTP Manager section, click Basic Editor... at the bottom right, the Basic GCP/MTP Editor window will appear.

PIX4Dmapper open Basic Editor

       The Basic Editor is at the bottom right.

3. On the GCP/MTP Table, select the GCP to be marked....

       Select the GCP to be marked on the GCP/MTP Table

4. On the Images section, sort the image 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.

5. On the Images section, select the image on which the GCP should be marked. After the selection, the image is displayed in the Preview section.
6. 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 press the Alt key. When the key is released, the view returns to the last zoom level.
    • Zoom out to preview the zero zoom level: Press the Shift key. When the key is released, the view returns to the last zoom level.

7. Left click on the image to mark the point.

PIX4Dmapper mark gcp in basic gcp mtp editor

       Mark the GCP in the Preview section.

8. (optional) If it is needed to remove a mark, click trashbin.png Remove.
9. On the Images section, select the next image on which the GCP should be marked.

 
Note: A GCP does not need to be identified / marked on all images in which it appears. Ideally, mark a GCP on 3 to 8 images (the minimum number of images is 2). The Quality Report after step 1.Initial Processing indicates if it is needed to mark the GCP on more images.

10. Repeat steps 5 to 9 for other GCPs.
11. Click OK.

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