ok this has been bugging me for a while and i cant figure it out. every time i process a particular field i do near a river bend there are these blurry patches in the orthomosaic that show up in basically the same location regardless of flight direction or time of day. using DroneDeploy, Phantom 4 Pro v2, flying at 120m with 75/75 overlap front and side. the rest of the mosaic looks fine.

at first i thought it was motion blur from wind but ive flown it on dead calm days and same thing happens. the raw images look sharp, its only after processing. GSD should be around 3cm at that altitude. genuinely stumped, anyone seen something like this

water. its almost definitely the river or reflections off wet ground near the bank. photogrammetry software absolutely struggles with water surfaces because the texture is either non-existent or constantly changing between frames so the feature matching just falls apart in those areas. theres not really a clean fix unless you mask those regions out before processing or just accept that water never reconstructs properly. some people paint it blue in post which is a bit hacky but works for client deliverables

yeah what the other person said about water is probably right but also worth checking if there's any agricultural plastic or greenhouse sheeting near that spot, those reflective surfaces cause the exact same problem and people dont always notice them from the air. had a nightmare of a processing job once because someone had laid out fresh black plastic mulch across like half the field and it just completely confused the matcher