Hi Gianluca, thanks for the explanation. It was very useful. Thanks to your explanations I managed to modify the DAT file to reproduce the USDA-NRCS texture triangle <https://www.nrcs.usda.gov/Internet/FSE_MEDIA/nrcs142p2_050619.jpg>. We are doing some final checks. After that, if you are interested, I can share the DAT file.
Thanks a lot! Laura On Fri, 12 Jun 2020 at 22:27, Gianluca Massei <[email protected]> wrote: > *.dat files are derived from TALCPP ( > https://www.tandfonline.com/doi/abs/10.1081/CSS-120017410). The values > describe polygons coordinates for different class inside the texture > triangle. In r.soils.texture is implemented an algorithm to check if a > single point is inside or outside a texture polygon. If the point is > inside it is labeled with the correspondent texture code and used to build > a texture map. > By > > Il giorno ven 12 giu 2020 alle ore 08:10 Laura Poggio < > [email protected]> ha scritto: > >> Dear all, >> I am looking at the DAT file >> <https://svn.osgeo.org/grass/grass-addons/grass7/raster/r.soils.texture/scheme/USDA.dat> >> for USDA soil texture classification for the r.soil.texture addon. >> I have a couple of questions. >> >> 1) the class silt-loam appears twice (number 8 and 12). Is this >> intentional and needed for the calculations? >> >> 2) Could you please explain the structure of the DAT file? As example >> 1 >> 6 >> 0 0 20 45 45 0 >> 100 60 40 40 55 100 >> >> First line: I think is the class value as written in the pixel. >> Second line: not sure >> Following two lines: I think they are somehow the limits of sand, silt >> and clay. However I can not really understand in which order. >> >> Thank you very much in advance >> Laura >> >> _______________________________________________ >> grass-user mailing list >> [email protected] >> https://lists.osgeo.org/mailman/listinfo/grass-user > > > > -- > Dott. Gianluca Massei, PhD >
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