Hi guys
I can see how to import the location and orentation data for each image, but I would like to know how to import or set the accuracy of the location data.
I'm importing images from the DJI Phantom 4 RTK and have accuracies for each photo. These values range from about 20mm to 3m depending on if it had RTK initialisation or not at the time.
Pix4D automatically reads this information from the images.
I am surveying with check points only, so the accuracy of the photos is very important.
As a side issue version 4.4.11.60 does not recognise the camera parameters for the 'undistorted' images from the DJI Phantom 4 RTK.
Cheers
Caleb
It seems CC doesn't have such option. There is only global aerotriangulation option to use accurate or inaccurate positions. Also there is option to only adjust positions using tolerance where you could input maximum range but have not noticed that it gives any better results.
Thanks Oto. That was my suspicion. I guess CC intends for all images in a Block to have the same accuracy and if mixing accuracies of groups of images to AT in different in Blocks and then merge.
The reason I use CC over Pix4D, is for the quality of the meshes, particularly for complex objects. So for these jobs I could do the AT in Pix4D, and then export the camera positions to CC. I will add the assigning of accuracy to individual images to the wish list.
>So for these jobs I could do the AT in Pix4D, and then export the camera positions to CC
It is of no use as CC calculates camera positions differently you won't get any improvements. But yes CC gives more accurate results just requires good input photos without out of focus photos and photos without rolling shutter distortions.
Regarding P4 RTK there is still not clear how the altitude values are used - https://communities.bentley.com/products/3d_imaging_and_point_cloud_software/f/contextcapture-descartes-pointools-forum/176371/dji-phantom-4-rtk-ntrip-processing/511214#511214
Caleb Baildon said:As a side issue version 4.4.11.60 does not recognise the camera parameters for the 'undistorted' images from the DJI Phantom 4 RTK
What do you mean by this? Undistorted images are flat so there are no camera parameters anymore.
All DJI Phantoms have fisheye lenses, but since the Phantom 3 the images are corrected for this on the fly, so the images you download from the drone do not have the barrel distortion (ie horizons are straight). However with the Phantom 4 RTK it now give the option to have the photos with out this correction applied to improve the accuracy of the processing. The camera in the Phantom 4 RTK is identical to the Phantom 4 Pro, but in Pix4D they have different calibration parameters. The RTK camera (without 'distortion correction' turned on) is a fisheye lens, and the Phantom 4 Pro is a rectilinear lens. However, it you use the RTK with the 'distortion correction' turn on, then choosing the calibration file for the Phantom 4 Pro in Pix4D works just fine.
I get what you mean about undistorted images not having camera parameters, but that just means they don't have real phyisical lens parameters, they can still have calculated/psuedo parameters, as they have for Phantom 3 and 4 cameras.
I hope Bentley have added support for the Phantom 4 RTK camera to Context Capture update 12.