Hello InVEST users!
I have a couple of queries about how to interpret the outputs of the NDR model. I hope that someone can help shed light on either of the following.
I’m using the NDR model to understand how effective riparian vegetative buffers are for nutrient retention in my local watershed. How can I determine exactly how much N ( in kg) the riparian buffers retain? I have a shapefile of all the riparian buffers in the watershed. I was hoping to use the shapefile to extract values from one of the output rasters. Is there an output raster or a combination of outputs that will tell me the amount of N retained by each pixel?
What’s the practical difference between “load_n” and “modified_load_n”? I understand that the “modified_load_n” takes into account the amount of runoff transporting nutrients. But, I don’t understand why, for a given pixel, my “modified_load_n” value is greater than my “load_n” value. Is it because the modified load of a pixel is the accumulation of load from other pixels carried to that pixel by runoff?