Hello everyone, I would like to know if is there any dataset avaiable to run the Nutrient Delivery Ratio model as a test. I have searched for this specific model and did not found, so, I have some questions about the biophysical table content. Is the source of the eff_x and crit_len_x obtained onl…

Hi @Fatemeh1 , Here is a link to the latest version of that chapter for NDR. All of the InVEST models’ User Guide chapters can be found online here or here . -Jesse

Look up Chaplin-Kramer et al. (2019) in Science. There is a reference in the appendix to ipbes-material (ref #40). However, it does only provide eff_p.

Thank you @proma , I could take these values in this reference. But the problem is that I can’t find examples of “p” values anywere, even inside the InVEST website plataform… So, usually people use diferent values of “n” to “p”?

Hi @Igor09 - Apologies for the missing NDR sample data, since we do provide it for other models. I’m actually in the process of redoing our freshwater sample data, and NDR will be included. In the meantime, here is the sample data that we’ll be providing, from a watershed in Kenya called Gura. NDR_…

No data set available to run the Nutrient Delivery Ratio model but you can get open source raster images such as rainfall and land use images through the websites. Biophysical data are derived from research paper within our context. But now we stopped to run NDR model in coastal area due to tidal in…

Thank you so much guys… Specially you @swolny and @proma , those data from the world export of N and P data from the study in Africa gave me a direction about the entry values to use. I noticed that in the InVEST user’s guide there is an example csv, table to run NDR. Is it possible to use those v…

Hi @Igor09 - The NDR coefficient table that is in the User Guide is intended only to show the format of the table, not to be used for standard or default coefficient values for real projects. Of course, you may use those values to make tests. But then for more official versions, you would want to g…

Thank you @swolny ! This answer makes a clearly undertanding about those input data for the biophysical table. For the crit_len_n, I will use the cell size anyway, which is 30m, and keep searching for the retention efficiency coefficient, even in global data as you suggested before.

@swolny Hi I need to the documentation of NDR model and some information about Borselli K parameter and critical length, but I canot find it in the website: http://releases.naturalcapitalproject.org/invest-userguide/latest/waterpurification.html this address has error . Thank you

@Fatemeh1 , the Users’ Guide chapter you linked to is for the old, deprecated nutrient model. The NDR documentation is available online at http://releases.naturalcapitalproject.org/invest-userguide/latest/ndr.html

Thank you for your replay :blush:

Database for Nutrient Delivery Ratio (NDR) model

Software Support

Topic		Replies	Views
How obtain the values of eff_n , eff_p, crit_len_n, and crit_len_p in model NDR? Software Support ndr	1	529	July 6, 2021
The input data of NDR Software Support ndr	15	1059	June 14, 2021
NDR model result with empty pixels Science, Research & Data ndr	4	119	July 25, 2025
Nutrient delivery ratio Software Support ndr	4	955	December 2, 2019
The "eff_n" is over 1: NDR biophysical table Software Support ndr	2	599	January 9, 2020

Database for Nutrient Delivery Ratio (NDR) model

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