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On 23/09/2010 03:47, Hamish wrote:<br>
<blockquote cite="mid:904502.25042.qm@web110009.mail.gq1.yahoo.com"
type="cite">
<pre wrap="">The fundamental and fantastic thing to realize about r.reclass is that is
doesn't actually write a new map, it creates a virtual map based on classes
of the original. It acts as a seamless filter between you and the data.
With a bit of imagination it can be an extraordinarily effective tool,
which after many years of using GRASS I think I'm only beginning to tap.
</pre>
</blockquote>
<br>
I am actually using r.reclass quite frequently in batch processing.
I read about the concept that a reclass map is some sort of a
lightweigt virtual map, but for simple-minded GRASS users like me,
r.reclass is just another map-creating raster module. As the
documentation states:<br>
<br>
> <span class="Apple-style-span" style="border-collapse:
separate; color: rgb(0, 0, 0); font-family: 'Times New Roman';
font-style: normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: 2;
text-indent: 0px; text-transform: none; white-space: normal;
widows: 2; word-spacing: 0px; font-size: medium;"><span
class="Apple-style-span" style="font-family: arial,sans-serif;"><span
class="Apple-converted-space"></span>As far as the user (and
programmer) is concerned, that raster map has been created.<br>
</span></span><a
href="http://grass.osgeo.org/gdp/html_grass64/r.reclass.html">http://grass.osgeo.org/gdp/html_grass64/r.reclass.html</a><br>
<span class="Apple-style-span" style="border-collapse: separate;
color: rgb(0, 0, 0); font-family: 'Times New Roman'; font-style:
normal; font-variant: normal; font-weight: normal; letter-spacing:
normal; line-height: normal; orphans: 2; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; font-size: medium;"><span
class="Apple-style-span" style="font-family: arial,sans-serif;"><br>
For quite a while, I used to always align the current region
settings with the base map before running r.reclass. After some
time, I noted that this isn't necessary, as the generated
virtual map is always based on the full extent of the base map
and its original resolution. I just couldn't find this
mentioned in the documentation.<br>
<br>
Hermann<br>
</span></span>
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