<div dir="ltr"><div><div><div><div><div>Hi All,<br><br></div>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. <br><br>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.<br><br></div>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.<br><br></div>Using QGIS 2.8.1 64-bit on Win7.<br><br></div>Cheers,<br></div>mike<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, Apr 15, 2015 at 4:30 AM, Ricardo Filipe Soares Garcia da <span dir="ltr"><<a href="mailto:ricardo.garcia.silva@gmail.com" target="_blank">ricardo.garcia.silva@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Jesus<div><br></div><div>Perhaps your input layer has no values that match the >= 73 condition?</div><div><br></div><div>I can reproduce this behaviour if I use a layer in which pixel values go up to 50 and I ask for pixels >= 60.</div><div><br></div><div>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)</div><div><br></div><div><br></div><div><br><div class="gmail_extra"><div><div class="h5"><br><div class="gmail_quote">On Wed, Apr 15, 2015 at 8:58 AM, Jesus Munoz <span dir="ltr"><<a href="mailto:jesusmunozserrano@gmail.com" target="_blank">jesusmunozserrano@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Good morning list!!<br>
<br>
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:<br>
<br>
(“Band 1 layer name" >= 73) * "Band 1 layer name”<br>
<br>
So basically, I am trying to obtain a layer in which all pixels with a value lower than 73 are removed.<br>
<br>
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???<br>
<br>
Jesus<br>
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</blockquote></div><br><br clear="all"><div><br></div></div></div><span class="HOEnZb"><font color="#888888">-- <br><div>___________________________ ___ __<br>Ricardo Garcia Silva</div>
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