The rayCloud displays the Ground Control Points (GCPs) in blue way above or below the model. The GCPs do not align with the images and the model.
After running step 1. Initial Processing and inserting the GCPs, no thumbnail is displayed in the right sidebar when clicking a point. The vertical shift between the images (wrong location) and the GCPs (accurate location) is too significant so that it prevents the points from being linked to the model. Therefore, the software cannot estimate the projection of the points on the images where the ground marks are supposed to be. As a consequence, the marking is impossible in the rayCloud.
Images' vertical coordinates written in the EXIF (geotags) are measured by the drone's geolocation equipment. These coordinates could be inaccurate for some drones and depending on the location of the area that is mapped.The resulting vertical shift can reach an error of 100 meters. As a consequence, it is recommend to process the project with GCPs to fix these uncertainties and to follow the procedure below to use the rayCloud for marking the points.
Once the project is created and the images are imported:
1. Run step 1. Initial Processing.
2. Select the appropriate coordinate system of the GCPs. For more information: 202560029.
3. Create 3 Ground Control Points (GCPs) manually using the right sidebar of the rayCloud. The mark of these GCPs should correspond that of GCPs that are intended to be imported later. For more information: 202560109.
4. Import the GCP coordinates into the project from the file using the GCP/MTP Manager. For more information: 202560039.
5. Just after importing the points, a window pops up. Click Yes to All, so that the previous coordinates of the 3 GCPs that were created are replaced with the information contained in the input file.
6. On the Menu bar, click Process > Reoptimize. The model should adjust to the 3 GCPs.
7. Mark the other GCPs (if any) in the rayCloud following: 202560769.