Journal
REMOTE SENSING
Volume 5, Issue 12, Pages 6382-6407Publisher
MDPI
DOI: 10.3390/rs5126382
Keywords
UAV; mobile laser scanning; LiDAR; photogrammetry; optical bathymetry; seamless DTM; DTM; elevation; river; Finland
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Funding
- Academy of Finland (RivCHANGE research project)
- Aalto Energy Efficiency research programme (project Light Energy-Efficient and Safe Traffic Environments)
- Research on resident-driven infill development possibilities-case study in urban areas in Finland (REPSU)
- Geography Graduate School of Finland
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Accurate terrain models are a crucial component of studies of river channel evolution. In this paper we describe a new methodology for creating high-resolution seamless digital terrain models (DTM) of river channels and their floodplains. We combine mobile laser scanning and low-altitude unmanned aerial vehicle (UAV) photography-based methods for creating both a digital bathymetric model of the inundated river channel and a DTM of a point bar of a meandering sub-arctic river. We evaluate mobile laser scanning and UAV-based photogrammetry point clouds against terrestrial laser scanning and combine these data with an optical bathymetric model to create a seamless DTM of two different measurement periods. Using this multi-temporal seamless data, we calculate a DTM of difference that allows a change detection of the meander bend over a one-year period.
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