When I ran the annual water output, the minimum value in the final grid result was a very small negative value
I did not solve this problem for several days, which hindered the progress of my graduation thesis, and asked the teachers for help
I have tried to unify precipitation, evapotranspiration, root depth, effective water content, and land use data to the pixel size of 1km (the initial land use data scale is the most detailed, 30m, and precipitation and evapotranspiration data is 1km), but the problem still cannot be solved
Very small values like this typically happen because of the accumulation of numerical error in a series of float32 calculations, and the values are, in fact, very close to what we would expect for the value of 0. If everything else looks OK with your outputs, I would suggest that you think of these values as though they are 0 and continue with your dissertation.
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