Mapping Flight at School Construction Site

A mapping flight was performed at an elementary school construction site to render a geo-referenced orthomosaic, digital surface model, and 3D textured mesh and point cloud.  The Pix4D app was used to configure the mapping flight line.  Photos were taken every two seconds at a flight altitude of 80 m (AGL) and ground speed of 10 m/sec.  These parameters, together with the drone camera’s wide field-of-view, ensured a high percentage of photo overlap (> 70%) that is necessary to achieve high-resolution photogrammetry results.  Overall, 87 photographs were taken during the flight that covered approximately 12.2 acres. The highly-overlapping photos yielded a ground sample distance (GSD) of one inch.  The orthomosaic, flight line, and photo locations are shown below, followed by an animation of the 3D textured mesh.