An Ortho-Mosaic Picture is a 2D scale representation of an area.  An Ortho-Mosaic is made up of numerous images taken with a drone and stitched together.  The geometry is corrected and the resulting picture or map is to scale.  Ortho-Mosaics can be used for documenting crash scenes, mapping property and buildings, documenting construction sites and many other things.  Ortho-Mosaics can be used to build before and after sliders.