Abstract
Abstract. Airborne LiDAR bathymetry allows an efficient and area-wide acquisition of water bottom points in shallow water areas. However, the measurement method is severely limited by water turbidity, impending a reliable detection of water bottom points at higher turbidity or in deeper water bodies. This leads to an incomplete acquisition of the water bottom topography. In this contribution, advanced processing methods are presented, which increase the penetration depth compared to the original processed data and enable a reliable extraction and detection of bottom points in deeper water bodies. The methodology is based on the analysis of correlated neighborhood information assuming a steady water bottom. The results confirm a significantly higher penetration depth with a high reliability of the additionally extracted water bottom points along with a larger coverage of the water bottom topography.
Highlights
Changes in water bottom topography can result from both, natural causes as well as human-induced activities
Airborne LiDAR bathymetry provides an area-wide measurement of the water bottom topography in
In turbid and deeper water bodies, many full-waveforms contain more than one potential weak bottom peak, so that the correctness of the detected bottom point cannot be guaranteed. The goal of this contribution is the development of an extended processing approach considering correlated neighborhood information to increase (1) the penetration depth of the water body, (2) the coverage of captured water bottom topography and (3) the density of bottom points with a high reliability
Summary
Changes in water bottom topography can result from both, natural causes as well as human-induced activities. Waterways are an important mode of transport and in Germany, for instance, the German Waterway and Shipping Administration (WSV) is responsible for their maintenance and an active waterway management (e.g. lowering of groin, clearing out of groin fields, widening of streaklines) For this purpose and for scientific applications, such as investigations of the German Federal Institute of Hydrology (BfG), reliable information about changes are required. Echo sounder sensors use the propagation of acoustic waves under water to determine the topography of water bottoms (similar to the laser scanning time of flight principle) It is an established method for a reliable acquisition of shallow water (e.g. riverbeds) and deep water (e.g. seabeds) bottom topographies in compliance with the minimum standards for hydrographic surveys (International Hydrographic Burea, 2011). The goal of this contribution is the development of an extended processing approach considering correlated neighborhood information to increase (1) the penetration depth of the water body, (2) the coverage of captured water bottom topography and (3) the density of bottom points with a high reliability
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