good day dear admin. What are the steps we need to take to measure surface roughness in the grass gis program. Is there a list you can send me about this? Because I ran r.roughness.vector code and got only vector strength and Fisher's K parameters. how do i get the surface roughness map ...
Hello, Carlos Grohmann here (I wrote the first version of r.surface.roughness)
Surface roughness is one of those subjects that can mean very different things depending on the context. I believe that you already have seen these papers, but I recommend them for a better understanding of surface roughness in geosciences.
Berti, M.; Corsini, A. & Daehne, A. Comparative analysis of surface roughness algorithms for the identification of active landslides Geomorphology, 2013, 182, 1-18
http://dx.doi.org/10.1016/j.geomorph.2012.10.022
Grohmann, C. H., Smith, M. J., & Riccomini, C. 2011. Multiscale Analysis of Topographic Surface Roughness in the Midland Valley, Scotland. Geoscience and Remote Sensing, IEEE Transactions on, 49(4): 1200–1213.
http://dx.doi.org/10.1109/TGRS.2010.2053546
The thing is, there are many definitions of surface roughness. Vector Strength and Fisher’s K are two of those, so these results are maps of surface roughness. Just like standard deviation of slope, which, in my opinion, is very good for geomorphology and morphotectonics. One nice thing about std-slope is that you don’t need any add-on to calculate it, just make a slope map (r.slope.aspect) and then you can play with r.param.scale to calculate the standard deviation using several window sizes and see which one gives the better answer for your scale of analysis.
And while we’re here, I’ll leave a few suggestions of papers on morphotectonics. The isobase method is quite nice. If you don’t have access to the papers at the publishers, in my website (carlosgrohmann.com), I have links for preprints/postprints which have the same content just different typesetting.
Grohmann, C. H., Riccomini, C., & Chamani, M. A. C. 2011. Regional scale analysis of landform configuration with base-level (isobase) maps. Hydrology and Earth System Sciences, 15(5): 1493–1504.
http://dx.doi.org/10.5194/hess-15-1493-2011
Grohmann, C. H., & Riccomini, C. 2009. Comparison of roving-window and search-window techniques for characterising landscape morphometry. Computers & Geosciences, 35: 2164–2169.
http://dx.doi.org/10.1016/j.cageo.2008.12.014
Grohmann, C. H., Riccomini, C., & Alves, F. M. 2007. SRTM-based morphotectonic analysis of the Poços de Caldas Alkaline Massif, southeastern Brazil. Computers & Geosciences, 33: 10–19.
http://dx.doi.org/10.1016/j.cageo.2006.05.002
Grohmann, C. H. 2004. Morphometric analysis in Geographic Information Systems: applications of free software GRASS and R. Computers & Geosciences, 30: 1055–1067.
http://dx.doi.org/10.1016/j.cageo.2004.08.002
Hope this helps
Carlos
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Prof. Carlos Henrique Grohmann
Institute of Energy and Environment - Univ. of São Paulo, Brazil
- Digital Terrain Analysis | GIS | Remote Sensing -
http://carlosgrohmann.com
http://orcid.org/0000-0001-5073-5572
Can’t stop the signal.