arco do andr interior - 3d model spamlab a873f75 andre&rsquo s arch large cave perua u caves national park minas gerais state southeastern brazil shows bottom half 100m-tall 50m-wide 250m-long made photos taken phantom4pro drone flying manually inside first sfm-mvs reconstruction based images we don&rsquo t know but think so if you better please get touch shown here simplified very-very-much version original metashape dense point cloud 500 milion points modelling activity research grant climate education americas using tree-ring speleothem examples pire-create supported funda o amparo pesquisa estado paulo fapesp 2017-50085-3 science foundation nsf usa lead profs francisco cruz igc-usp mathias vuille university albany