When a mission is completed, the application will first create the p4d file and then it will synchronize the image from the drone to the phone. The creation of the p4d file can take some time especially if there are a lot of images on the drone’s SD card. It does not only depend on the mission’s number of images but also on all images present on the drone’s SD card. A way to speed up the creation of the p4d file is to delete the images from previous missions before starting a new mission.
The speed of the p4d file’s creation will be much improved in future versions of the app.
The p4d file contains the name of the images and the accurate image geolocation. If you interrupt the process of the p4d file’s creation, it will be empty and it will not be possible to synchronize the mission afterward.
It is nevertheless possible to process the images that are on your drone’s SD card with Pix4Dmapper. However, since they contain a less accurate image geolocation, it is possible that multiple images will have the same geolocation, which can lead to some problems during the processing.
You can first try to process the images with the geolocation but if you are having issues during the processing it might be because many images have the same geolocation. If that is the case, you can remove the geolocation and process again.
If you do not have image geolocation, your model will not be scaled, oriented or placed. To geolocate your project you can add GCPs: