I'll answer my own question. TIFF rasters were doing null+value = null. So I converted to zmap with null = 0. Then, Grid-1+Grid2-Grid1=newgrid (where Grid1 had celles valued as 0 for null) worked.
On Fri, Sep 19, 2014 at 11:33 AM, Matt Boyd <mattsli...@gmail.com> wrote: > Hi List, > trying to get my head around the raster calculator. > I've 2 grids. Where grid 1 is null I want to replace it with grid 2. The > null value reported in the tiff using the info tool is nan. It's just a > single band. > > I've tried various iteration of this... > > ("P_Clip_fill@1">0) * "P_Clip_fill@1"+("P_Clip_fill@1"<=0)*"Z_Clip_fill@1" > > Any tips? > thanks > Matt > >
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