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<p>Hi folk,</p>
<p>I hardly never work with raster calculations, and unfortunately
there is nowhere a collection of syntax examples for different use
cases to be found (documentation :( ).</p>
<p>Anything apart from +-*/ is beyond my scope.</p>
<p>So,</p>
<p>I made a viewshed analysis over a digital surface model (try the
awesome Visibility Analysis plugin form Zoran Čučković and buy him
a beer!)</p>
<p>A lot of "views" are caught by tree canopy, but I am only
interest in the flat grounds.</p>
<p>So I substracted the surface model layer from the ground model
layer, and this is Layer 1. <br>
</p>
<p>Giving a threshold of 1 meters difference for inaccuracities, all
pixels in this layer above 1 should result in 0 (zero) in my
viewshed raster (Layer 2)</p>
<p>Please give me some hints,</p>
<p>Cheers,</p>
<p>Bernd<br>
</p>
<p><br>
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