Hi: I have a geotiff now, and some cells have a not-expected value, so I want to Interpolation them, and I notice that there is a command named r.fillnull, however the cell to be changed is not null, so I want to : 1) change the special cell value to null 2) use the r.fillnull to Interpolation.
The problem is I do not know how to do the step 1 with grass, anyone can do me a favor? Thanks.
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