[GRASS-user] r.soils.texture question
agr.gianluca.massei at gmail.com
Thu Jun 25 08:21:12 PDT 2020
yes, of course!
Il giorno gio 25 giu 2020 alle ore 09:51 Laura Poggio <
laura.poggio at 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!
> On Fri, 12 Jun 2020 at 22:27, Gianluca Massei <
> agr.gianluca.massei at 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.
>> Il giorno ven 12 giu 2020 alle ore 08:10 Laura Poggio <
>> laura.poggio at gmail.com> ha scritto:
>>> Dear all,
>>> I am looking at the DAT file
>>> 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
>>> 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
>>> grass-user mailing list
>>> grass-user at lists.osgeo.org
>> Dott. Gianluca Massei, PhD
Dott. Gianluca Massei, PhD
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the grass-user