Exponential Decomposition
Exponential Decomposition (XDC) is typically able to extract bathymetric points further underwater than Online Waveform Processing (OWP). XDC accomplishes this by averaging several waveforms to increase the signal-to-noise ratio in regards to bathymetric returns.
XDC processing is more intensive and requires processing to be restricted to only areas with water coverage. This is done using a GEOJSON format polygon definition file. See the following Riegl documentation regarding creating a GEOJSON polygon in QGIS and ArcGIS:
Once the polygon is created, you should enable XDC and waveform averaging:

Ensure that your Water Surface Selector is also set to use the same GEOJSON polygon:

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