[Qgis-user] Re: How to draw a polygon shapefile around raster pixels?

[boesiii]

I tried using r.mapcalc with "slope_gt40_map=if(47001310ee>=40,1)" and all I
get is a black raster and every pixel has a value of 1.

I also tried using r.mapcalculator with "A>40" but the resulting raster
still has pixel values less than 40.

What is the correct code I should be using for either tool?
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