Breadcrumbs

GCP definition [Aerial]

  • The workspace of the Ground Control Points page is organized as follow:

    image-20250119-184216.png

  1. Top bar: the main menus of the X-Photo Processing manager.

  2. Photos list: The complete list of the imported photos, with the indication of the GCPs it includes:

    image-20250119-191359.png

The photos can be filtered by GCP image-20250119-191503.png

  1. Zoom-in: of the selected Photo, with the GCP locations.

To Show the tie points used, select image-20250119-191843.png

  • GCP view: the GCPs can be visualized in 2 views.

    • Map view, by clicking on image-20250119-192338.png

      image-20250119-192117.png

    • Graphic view, by clicking on image-20250119-192318.png

      image-20250119-192216.png

  1. GCPs list: with the coordinate differences.

    • The map visualization can be linked to the selected GCP from the list, by clicking on image-20250119-192949.png

    • If needed, markers can be deleted, either by deleting:

      • the last know marker, by selecting image-20250119-193307.png from the Delete Markers function.

      • or all the markers and redefine them from scratch, by selecting image-20250119-193454.png

Defining the ground control points

  • To start the GCP definition process, click on image-20250119-135057.png

  • In this step, we have to manually define at least three GCP:

    • by holding CTRL and press left button to add a GCP marker.

      image-20250119-151452.png

    • Or right button and select the GCP from the list to mark it as a known GCP.

      image-20250119-135310.png

Once you manually define at least three GCP, the remaining targets could be automatically recognized.

  • We can drag the selection to the center of the target to define it.

    image-20250119-182400.png

  • Once you’re satisfied with these first results, you can proceed to the next step.

    image-20250119-183825.png