WE have a similar problem. Our InVEST models outputs, in particular the SDR model sed_export output, seem OK….but when a Land-use raster scenario is applied, and a new SDR model run done….
The ‘’change’’ raster (scenario – baseline rasters) sed_export raster contains a large number of negative very small numbers. The same to a lesser problem with our NDR model runs too.
I have not been able to find the source of this issue. The input LULC rasters seem OK, the biophysical table seems OK, projection and raster alignment seem OK,output intermediate churn aligned_LUC differences between scenario and baseline seem OK. After some discussion with a few people knowledgeable of the InVEST models I have not found a cause of this nor a solution.
Any suggestions ? Thanks.
Gordon in NB