I am currently using InVEST SDR to estimate the sediment export of some watersheds in France. I am using a 25 meters mesh and a 100 meters mesh. The results are pretty close between these two meshes but I overestimate my validation data by 10 each time.
I have compared InVEST SDR with a manual way to compute sediment export and it’s doing good compare to my validation data. The only difference between the two methods is that the LS factor is really high compare to the one I am manually computing with QGIS (Desmet and Govers 1996 equation).
I would to know if someone has met the same issue and if the LS factor could be the only reason of the overestimation of my sediment export estimation.
Thank you and cheers from France.