UAS MultiView Stereo Photogrammetry for Shallow Water Bathymetry in Lakes: Empirical Comparison with Echo Sounding Reference Data

Authors: Gernot Paulus*, School of Geoinformation, Carinthia University of Applied Sciences, Karl-Heinrich Anders, School of Geoinformation, Carinthia University of Applied Sciences, Peter Mayr, iC flussbau GmbH, Rudi Schneeberger, Viewcopter e.U., Thomas Piechl, Carinthian Provincial Government, Department 8 Environment, Water and Nature Conservation
Topics: UAS / UAV, Geomorphology, Water Resources and Hydrology
Keywords: UAS, Bathymetry, Echo Sounding, Multiview Photogrammetry
Session Type: Paper
Day: 4/9/2020
Start / End Time: 8:00 AM / 9:15 AM
Room: Governors Square 14, Sheraton, Concourse Level
Presentation File: No File Uploaded

In 2018, one of the largest scientific drone-based geodata acquisition projects in Austria took place in Carinthia with the aerial survey of the entire Lake Woerthersee shore with a length of almost 50 km.
The aim of this research project is the creation of a very precise digital three-dimensional terrain and surface model of the riparian strip of Lake Woerthersee, with special consideration of the water-land transition area. The expected results are the "missing digital link" - the missing digital building block to a seamless, consistent and complete 3D model between already existing LIDAR terrain data of the lake environment and an echo sounding hydrographic survey of the entire Lake Woerthersee area.
Challenges in this research project are the management and multi view stereo photogrammetric processing of the huge volume of digital data and the fusion of the various 3D terrain and surface data of the shore environment, the transitional area and the lake bottom into a holistic, seamless three-dimensional digital 3D model.
We focus on the empirical comparison and critical discussion of bathymetry data of the shallow water areas, which were captured with 2 different methods. For this purpose, about 8000 single-beam echo sounding single point measurements are compared quantitatively with UAS-based multi view stereo photogrammetric derived surface models of the shallow water areas.

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