Hi All, Was encountering a similar problem with Raster Calculator [albeit a bit different] just yesterday - I had a layer that had values ranging ~0-1000 (integers). I wanted the layer to represent probability values (ranging 0-1), so I used the raster calculator to divide it by 1000.
I ended up with 'nan' values displayed as the max and min on the Layers pane and when I try to get into the properties I get a "Bad allocation" message. Using the 'Identify Features' tool, the values look appropriate, but I can't adjust the style or anything. I ended up doing what I needed in R for now, but it would be great to work through this issue - I'm open to any suggestions, or can send the data in case others want to test. Using QGIS 2.8.1 64-bit on Win7. Cheers, mike On Wed, Apr 15, 2015 at 4:30 AM, Ricardo Filipe Soares Garcia da < [email protected]> wrote: > 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 > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user >
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