Smooth operator…

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crs
Different methods of hydrological conditioning and smoothing and the new CRS algorithm now available in TopoToolbox (Source: Schwanghart and Scherler, 2017).

No, this post is not about my favorite interpretation of this song by Senor Coconut. Its about our latest discussion paper submitted to ESURF in which Dirk and I introduce a novel way to smooth river profiles. We show that DEMs in valley bottoms are characterized by errors with positively-skewed distributions and are often biased to higher values. These errors are more pronounced in high topographic relief, thus limiting our ability to interpret profiles. We also assess uncertainties of profiles derived from different globally available DEMs and find that the ALOS World 3D 30 m (AW3D30) DEM outperforms other DEMs in terms of precision and accuracy.

The manuscript comes with a set of functions that are now part of TopoToolbox and that I will cover in more detail in the following weeks. Here is a quick overview:

STREAMobj/smooth
STREAMobj/quantcarve
STREAMobj/crs
STREAMobj/crslin
STREAMobj/crsapp

and

FLOWobj/quantcarve

Have fun exploring these new functions. I will be back here with more information soon.

References

Schwanghart, W., Scherler, D., 2017. Bumps in river profiles: the good, the bad, and the ugly. Earth Surface Dynamics Discussions 1–30. [DOI: 10.5194/esurf-2017-50]
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