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SDR model V 3.3.3

Hi there,

Has anybody compared SDR results from InVEST  versions  3.2.0 and  3.3.3?

I´m getting some differences using exactly the same inputs  and was just wondering whether someone else
had the same issue.




  • swolnyswolny Member, NatCap Staff
    There was at least one change between version 3.3.2 and 3.3.3 that impacts the sediment export values output by the model. This update is described like this in the HISTORY.rst file in the InVEST install folder:

    "Fixed an issue with SDR that caused the LS factor to be an order of magnitude too high in areas where the slope was greater than 9%.  In our sample case this caused sediment export estimates to be about 6% too high, but in cases where analyses are run over steep slopes the error would have been greater."

    Perhaps this explains the difference you're seeing?

    ~ Stacie

  • Hi Stacie,

    Many thanks for your comments.  The
    difference is with the 3.2.0 version. I am trying to download the 3.3.2 to give
    it a try but I get an error message (404.not found).  Do you know if this version is still

    On the
    other hand, that difference (6% or more)  is by pixel? Or by sub-watershed?

    Thanks a
    lot again,


  • jdouglassjdouglass Administrator, NatCap Staff
    Hi Silvia, here's the link to the download:

    And thanks for the heads-up about the broken link!  I just fixed it.
  • jdouglassjdouglass Administrator, NatCap Staff
    Whoops ... that's to 3.3.2, which is broken.  Here's the link to InVEST 3.2.0:

  • Thank you! :-)
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