Raster calculator has a nasty bug on 26 and 28 that its truncating values. I dont have The correct number but I suggest you do a search on The bugtracker and add dome weight to it.
it looks serious enough and its a blocker but without any comments. On Wednesday, April 15, 2015, Michael Treglia <[email protected]> wrote: > 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] > <javascript:_e(%7B%7D,'cvml','[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] >> <javascript:_e(%7B%7D,'cvml','[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] >>> <javascript:_e(%7B%7D,'cvml','[email protected]');> >>> http://lists.osgeo.org/mailman/listinfo/qgis-user >>> >> >> >> >> -- >> ___________________________ ___ __ >> Ricardo Garcia Silva >> >> _______________________________________________ >> Qgis-user mailing list >> [email protected] >> <javascript:_e(%7B%7D,'cvml','[email protected]');> >> http://lists.osgeo.org/mailman/listinfo/qgis-user >> > > -- George R. C. Silva SIGMA Consultoria ---------------------------- http://www.consultoriasigma.com.br/
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