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I want to use r.mapcalc to calculate a raster from two inputs: water_rst and contour_rst. I need a raster with all values from water_rst and then values from contour_rst where water_rst has no data.

An expression like comb_rst = not(if(water_rst))*contour_rst produces raster with only contour values, but no initial water values. How to modify this expression to get both water values and contours?

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This expression does the trick: if(isnull(water_rst), contour_rst, water_rst)

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