The Contribution of Drone Photographic Acquisition in Risky Survey Conditions: A comparison of two experiences

In situations where some portions of a building are inaccessible (particular architectural conformations or earthquake damage) it is necessary to adopt an integrated approach that combines range-based data acquired from terrestrial laser scanning and image-based 3D data acquired using an UAV equipped with a digital camera. This paper presents the results of a point-cloud-based survey made on two different case studies. The goal is to define a workflow for processing dense 3D models that can be used to describe complex buildings for different purposes (high-/low-poly 3D models, specific 2D representations).