Mapping Complex Riverine Environments with Topo-Bathymetric LiDAR: Project Design Considerations for Multi-Function User Groups
In summer 2017, Quantum Spatial, Inc. completed collection of high resolution topo-bathymetric LiDAR data over 160 miles of the Willamette River in the Pacific Northwest for USGS and USACE partners. The project was conducted under tasking by the United States Army Corps of Engineers to generate elevation data to support modeling efforts in areas of flood plain management, water quality, and aquatic habitat. Capturing viable airborne LiDAR data for multi-use studies requires careful acquisition planning that accounts for water quality, flow stage, and seasonal vegetation patterns. Initial LiDAR coverage was used to inform focused boat-based sonar surveys which were used to complete a seamless elevation model of the entire river channel and floodplain. Data was processed according to the National Coastal Mapping Strategy 1.0 specifications adopted by the Joint Airborne LiDAR Bathymetry Technical Center of Expertise interagency members. Data was delivered in LAS format based on the LAS Domain Profile for Topo-Bathy LiDAR data. This presentation will cover acquisition planning and execution, refraction processing methodology, sensor selection, and results including depth, coverage, and accuracy.