Can someone please advise where to find a good tutorial for 3D building model data collection, and for best settings in Pix4D for processing 3D building models?
I’m using the Pix4Dcapture app using a double grid mission (DJI P4P v2 and Mavic 2 Pro). Under step 1. Initial Processing > Matching, I’m a bit confused whether to select either “Aerial Grid or Corridor” or “Free-flight paths or Terrestrial” since the default processing option when selecting the 3D model processing option is “Free-flight paths or Terrestrial” yet the flight data set is captured as an “Aerial Grid” data set.
I couldn’t find anywhere in the support knowledge base this is clearly defined, and why the default is set to “Free-flight paths or Terrestrial” other than it mentions briefly “for example, taking images around a house or a statue” as to use this for a fly around for towers or around a building in an orbit flight? Which one is the correct one to select for 3D building models?
Also should “Use Geometrically Verified Matching” be selected, since it is also not set as default?
Further, on a data set I had generated using a double gird (Using Litchi) and with oblique camera slightly forward pointing, the data set ended up concave. I see the computed optimized camera points are raised at the perimeters a lot from where the GPS points are. Any idea why this has happened?
Any advise would be much appreciated.