Accurate, high-resolution elevation data for both exposed and submerged features in alluvial systems improves hydrologic and morphodynamic modeling. However, while most LiDAR and drone-based photogrammetry excel at capturing surface topography, they provide limited information about channel bed elevations below the water surface. We demonstrate a workflow to generate and stitch together high-resolution elevation data for both exposed and submerged features. This method integrates drone-based Structure from Motion DEMs with easily obtained field measurements and optical bathymetry tools to generate a single high-resolution, high accuracy topographic and bathymetric DEM raster.
