Dear Sir or Madam, I have encountered some issues, the user guide mentions that I can choose to use the data from soilgrid to calculate AWC, which also mentions that the AWC data after the weighted calculation processing can be used as input to the model. Is this a clerical error? Can this AWC be imported directly into the model (since the model requires the input PAWC)
Hi @JasonLee -
The ISRIC AWC data does require additional processing before it can be used in the model. As the User Guide notes:
One global AWC raster is provided by ISRIC, as part of their 2017 SoilGrids product, called SoilGrids250m 2017-03 - “Derived available soil water capacity (volumetric fraction) until wilting point” (ISRIC Data Hub). These layers require additional processing to convert the units from percent to fraction, using the soil depth of each layer…
If you are using the global SoilGrids 2017 AWC data, following is one way of processing it into the input required for InVEST, using GIS software.
SoilGrids 2017 provides AWC layers for 7 soil depth intervals. All 7 depth intervals need to be downloaded, then combined into a single layer for use in the model.
Luckily, our software team has already done this processing on the ISRIC AWC data, to create a global PAWC layer that can be used in the Annual Water Yield model. You can find it on our new DataHub - you can search for “AWC”, download your area of interest, and use it directly in the model.
~ Stacie
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Thank you very much for your answer, I’ve done it this way, I just mistakenly thought that I would get AWC after this treatment, not PAWC. Now it seems that it is a PAWC after this treatment. Thanks again for your answer