Vertical aerial photographs were taken on Joal spit using a Canon EOS 5D Mark II camera and full frame sensor embedded in a gyroplane. A first range of treatments under Agisoft PhotoScan software has generated an orthophoto with 5 cm resolution and a
digital surface model (DSM) with 20 cm resolution. A second range of treatments allows, using ArcGIS® software, the assessment of the vertical accuracy of the DSM, comparing it differentially with a topographic survey previously conducted in the same site with Very High Resolution Real Time Kinematic (RTK) Differential Global Positioning System (DGPS). The results of this assessment are analyzed and discussed.

KEYWORDS

Photogrammetry, spit, coastal geomorphology, DSM, RTK, DGPS