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natcap / invest

InVEST®: models that map and value the goods and services from nature that sustain and fulfill human life.
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Allow raster input option for USLE C in SDR #883

Open dcdenu4 opened 2 years ago

dcdenu4 commented 2 years ago

A user on the forums asked whether the curve numbers could be input as a raster instead of through the biophysical table for the urban flood model. Stacie mentioned that such a feature for other models has been requested frequently in the past, such as USLE C for the SDR model.

Link to forum discussion: https://community.naturalcapitalproject.org/t/biophysical-table-for-urban-flood-mitigation/2044/12?u=dcdenu4

I'm making this issue with the intent on having a place to formally document these requests to see if there's enough demand to have a discussion about this in the future.

dcdenu4 commented 2 years ago

Another request for SDR USLE C input as a raster.

https://community.naturalcapitalproject.org/t/raster-of-c-values-as-landuse/2962

dcdenu4 commented 2 years ago

Noting that @adrianvogl is in support of SDR with raster based C values - via a private Slack thread.

newtpatrol commented 2 years ago

Adding a +1 here. I'm helping project partners run SDR, and they want to derive USLE C from NDVI (a very common thing to do), which produces a raster. Yes, we can take the average NDVI-derived value within each LULC area and assign that through the biophysical table, but that dumbs down the finer-scale C raster data unnecessarily.

Not only is deriving USLE C from NDVI a common thing to do in general, it's especially common in data-poor areas (like Alaska, where this current project is), where there are zero studies providing already-calculated C values by land cover type. So users can make use of more localized NDVI data, instead of using extremely generic C values, and/or values derived in Iowa.

And we do have this functionality already coded for other projects, so while it is another Thing to Do, and changes the UI, it's at least part way done.

dcdenu4 commented 2 years ago

Thanks @newtpatrol for the comment! I changed the title of the issue to reflect SDR specifically. I think there's enough use cases and demand to move this from on hold and question. We will look to implement this in a future InVEST release.

newtpatrol commented 2 years ago

@dcdenu4 Not sure if this is the place to pile on, now that it's been changed to SDR specifically, but a forum user just asked about using an NDVI method to create Kc rasters for SWY too, so I wanted to add a +1 for that.

dcdenu4 commented 1 year ago

Larger effort taking place here: #1388