Abstract
This study examines a method for extracting water depth information for river environment assessment using a commercially available UAV and its standard optical camera. The UAV's autonomous flight and image capture were conducted using existing software, and orthophotos were generated from the acquired still images. By applying several image processing techniques, water depth data consistent with actual measurements were obtained, and the distribution trends of water depth were visually represented. As a result, it became possible to visualize river environmental information over a wide area and quantitatively capture its spatiotemporal variations.
https://ror.org/00xy44n04 
