I’m currently comparing Pix4D (cloud), Dronedeploy and WebODM.
One of my findings is the area measurement of a roof is different between WebODM (~203m²) and Pix4D/Dronedeploy (~250m²) with the latter beeing the correct value.
It seems WebODM (Potree) is only giving me the 2D area even I measure in 3D. At least the value of 200m² is the 2D surface area which Pix4D and Dronedpeloy show.
If we calculate the roof of the shed manually we can easily do it by calculating both rectangles and add the value of both to the total area. In my example we have 19m x 6,7m = 127,4m² for one side.
127,4m² * 2 = 254,6m² → which matches Dronedeploy/Pix4D but not WebODM.