Hello,
I am usually processing orthomosaics for further displacement/volume change analysis from UAV data with Pix4D mapper. I´ve now been trying to do the same from GoPro videos. I have several videos from a flight with a plane that had 4-5 GoPro cameras mounted to it, looking in different directions for different angles of the same area. I exported 2 frames per second (with EXIFtool) from all those videos and now have a few question on how to further process them in Pix4D, to get the best orthomosaic I can regarding georeferencing (and resolution):
- Since its multiple sets of images from 4-5 cameras, do I still load them all in one project at once or does it make more sense to process them singularily and then combine them later on?
- For Processing Options in 3D Maps, is there anything I should consider specifically, since the images are frames from a Vvideo taken from a plane that was not always flying in a stable height/angle…?
- I don´t really have GCPs from the area, only a set of estimated ones, mapped from a orthomosaic provided by the province. Is that still better then using no GCPs, or will it make things worse regading georeferencing
- My Point clouds tend to have a lot of noise due to shadows and steep terrain (flight was over a high mountain area) and because the plane turning while flying I have quite a lot of sky in my point clouds. I haven´t found anything on how to filter the point clouds in a systematic way, except for doing it manually which turns out to be quite difficult in non flat terrain.
A lot of questions… any thoughts and ideas on how to improve my workflow would be really appreciated!