Hi Jesus Perhaps your input layer has no values that match the >= 73 condition?
I can reproduce this behaviour if I use a layer in which pixel values go up to 50 and I ask for pixels >= 60. Otherwise, if the input layer has values above the threshold, it seems strange and I cannot seem to reproduce it here (QGIS 2.8.1) On Wed, Apr 15, 2015 at 8:58 AM, Jesus Munoz <[email protected]> wrote: > Good morning list!! > > I am trying to do a cloud mask for a Landsat image based on the values of > the pixels where the clouds are found. I am using the raster calculator for > this purpose by introducing the expression: > > (“Band 1 layer name" >= 73) * "Band 1 layer name” > > So basically, I am trying to obtain a layer in which all pixels with a > value lower than 73 are removed. > > However, after calculating this expression I only get an empty raster > layer, only visible in the layers panel and populated only by “nan” values. > Does anybody know what am I doing wrong??? > > Jesus > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user > -- ___________________________ ___ __ Ricardo Garcia Silva
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