We are probably aware of the contribution of large scale Lidar surveys to understanding the landscape around us, by organisations using aircraft or drone borne commercial Lidar and 3d mapping systems, but you may not be aware that this technology is to hand for smaller scale modelling in your iPhone Pro (and some other) mobile phones, together with free 3D mapping apps! Peter takes us through the amazing technology that makes this possible, suggests some practical uses and explains the sources of some of the minerals involved.