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<p style="margin-bottom: 0cm; margin-top: 0pt;">Three equivalent
answers in as many minutes. Talk about good service ;-)</p>
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<p style="margin-bottom: 0cm; margin-top: 0pt;">On 26/12/2010 13:10,
Malte Martin wrote:</p>
<blockquote
cite="mid:45034C8C-6200-4850-BC7E-AD7AB234753E@perlomat.de"
type="cite">Hi
<div><br>
</div>
<div>should be something like (untested)</div>
<div><br>
</div>
<div><span class="Apple-style-span" style="font-family: Times;"><tt>r.mapcalc
'elevation300map=if((originalelevationmap >
300),originalelevationmap,NULL())'</tt></span></div>
<div><span class="Apple-style-span" style="font-family: Times;"><br>
</span></div>
<div><span class="Apple-style-span" style="font-family: Times;"></span><span
class="Apple-style-span" style="font-family: Times;">this
means:</span></div>
<div><span class="Apple-style-span" style="font-family: Times;"><br>
</span></div>
<div><span class="Apple-style-span" style="font-family: Times;">if
originalelevationmap > 300 get the value from the
originalelevationmap, otherwise the value should be NULL and
all is wirtten to the map elevation300map.</span></div>
<div><span class="Apple-style-span" style="font-family: Times;"><br>
</span></div>
<div><span class="Apple-style-span" style="font-family: Times;">Otherwise
take a closer look to</span></div>
<div><font class="Apple-style-span" face="Times"><a
moz-do-not-send="true"
href="http://grass.osgeo.org/gdp/html_grass64/r.mapcalc.html">http://grass.osgeo.org/gdp/html_grass64/r.mapcalc.html</a></font></div>
<div><span class="Apple-style-span" style="font-family: Times;"><br>
</span></div>
<div><span class="Apple-style-span" style="font-family: Times;">I
haven't used r.mapcalc for a long time so I don't know if
there had been changes in the syntax - the trick is to use the
if clause implemented in r.mapcalc. I have no QGIS/GRASS
installed on this pc...</span></div>
<div><span class="Apple-style-span" style="font-family: Times;"><br>
</span></div>
<div><span class="Apple-style-span" style="font-family: Times;">I
hope that helps and merry christmas</span></div>
<div><span class="Apple-style-span" style="font-family: Times;">Malte</span></div>
<div><span class="Apple-style-span" style="font-family: Times;"> </span><br>
<div>
<div>Am 26.12.2010 um 11:51 schrieb Catlike:</div>
<br class="Apple-interchange-newline">
<blockquote type="cite">
<div><br>
Thank you for reading.<br>
I am trying to use r.mapcalc, through QGIS, to take an
elevations raster<br>
with a wide variety of values and create a new elevations
raster which only<br>
contains those cells that have a value over a certain
number (in this case,<br>
300 meters). <br>
Unfortunately, the QGIS graphic user interface does not
show me what the<br>
actual command I create is. <br>
What I get when I run the command is a new raster in which
every cell has<br>
been converted to equal 300 meters! <br>
What should I do differently? <br>
Again, thank you.<br>
-- <br>
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</blockquote>
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<div style="word-wrap: break-word;">
<div>Malte Martin</div>
<div>----------------------------</div>
<div>+ 49 531 2258085</div>
<div>+ 49 177 3841416</div>
<div><br>
</div>
<div>Comeniusstr. 4</div>
<div>D-38102 Braunschweig</div>
<div>skype: maltehm</div>
<div><br>
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</blockquote>
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<br>
<pre class="moz-signature" cols="62">--
Micha Silver
<a class="moz-txt-link-freetext" href="http://www.surfaces.co.il/">http://www.surfaces.co.il/</a>
Arava Development Co. +972-52-3665918
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