yes, of course! GM Il giorno gio 25 giu 2020 alle ore 09:51 Laura Poggio < laura.pog...@gmail.com> ha scritto:
> 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 < > agr.gianluca.mas...@gmail.com> 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 < >> laura.pog...@gmail.com> 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 >>> grass-user@lists.osgeo.org >>> https://lists.osgeo.org/mailman/listinfo/grass-user >> >> >> >> -- >> Dott. Gianluca Massei, PhD >> > -- Dott. Gianluca Massei, PhD
_______________________________________________ grass-user mailing list grass-user@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/grass-user