Hi there.
I'm wondering if someone have a few tips and tricks on how to plan a mission to scan a large urban area with lots of buildings?
I know this is a complex task, I have experience with regular mapping missions and how to scan and proccess such areas without any complex or tall structures. I've also done some single buildings with OK results. I've tried a few training missions with complex structures and processed some of them, but the models gets a lot of noise. I recon it's the data collected that needs to be better, the workflow in Agisoft is not a problem I guess.
I've read a couple of other threads here on Agisoft, and some guides from other websites, but I'm struggling to find the best workflow for this type of mission. A regular mapping, even with over 90% overlap simply won't cut it. The building facades won't get any points so I need oblique/tilted photos. The problem is how to capture these photos and how close to the buildings. I've tried to add a large circle with angled photos, but this is not enough to get details, and just adds a lot of noise to the model.
Would it be a good way to fly with a slighty forward tilted camera, and fly the mission 2-4 times in diffrent directions? Do I need to circle every single building to get the best results? Or maybe start off with a large circle tilted towards center, and add several other circles towards the center? I'll attach a screenshot from Google Earth (Even they make good 3D models from urban areas)