Posting Guidelines (delete this before posting)
Are you using the latest version of InVEST?
Have you have read the entire user’s guide section for your model?
Have you searched the forum for similar questions using keywords from the error message? Many common problems have already been answered.
If you have tried all of these steps and still have a question,
Fill out the sections below.
Use the “optional tags” button above to tag this topic with the model you are using.
Give this topic a descriptive title including the model name and keywords from your specific problem. Avoid very generic titles.
Examples of good titles:
✓ Habitat Quality model runs successfully but generates empty maps
✓ GLOBIO: KeyError in load_msa_parameter_table
✓ Coastal Vulnerability: ‘Could not open … as a gdal.OF_RASTER’
Dear Nat Cap,
I just downloaded the new Invest and realized the changes to the SDR model. I am in the process of writting a manuscript with values derived from the previous version, where sediment deposition was the recommended output. However, now this output has been replaced with avoided erosion and avoided exports. Is it still correct to use sediment deposition from the previous model version? Can you provide details as to why sediment deposition is no longer the recommended output?
Hi @rdejesuscrespo ,
With the recent modifications to InVEST 3.12.0, the SDR model still produces a raster of sediment deposition, although the calculations of deposition and flux have both been changed slightly to avoid a form of double-counting. This is described in the User’s Guide under “Recent Changes to the SDR Model”.
The other outputs you mention, avoided erosion and avoided export have been added, but they do not replace sediment deposition. In fact, deposition/“trapping” is one of the inputs to the avoided export raster. These new outputs are intended to more clearly indicate services provided by the ecosystems. These are more fully described in the corresponding User’s Guide section.
More directly addressing your questions:
Is it still correct to use sediment deposition from the previous model version?
The former deposition output (before InVEST 3.12.0) double-counted the role of vegetation, and so the newer InVEST version will be more conceptually consistent.
Can you provide details as to why sediment deposition is no longer the recommended output?
A description of why we changed the model in the ways that we did is outlined in the user’s guide at SDR: Sediment Delivery Ratio — InVEST documentation.
Please let us know if you have any further questions!
Thank you! Very helpful response.