<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">On Sun, Feb 16, 2014 at 8:36 AM, Jukka Rahkonen <span dir="ltr"><<a href="mailto:jukka.rahkonen@mmmtike.fi" target="_blank">jukka.rahkonen@mmmtike.fi</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">Hi,<br>
<br>
I was thinking that a possibility to run images through filters with GDAL<br>
could be nice sometimes. Especially for visual work with aerial and<br>
satellite images filters like "sharpen" of "unsharp mask"<br>
<a href="http://en.wikipedia.org/wiki/Unsharp_masking" target="_blank">http://en.wikipedia.org/wiki/Unsharp_masking</a> are often very useful. But then<br>
I found that kernel filters can already be used inside VRT files. Are there<br>
usage examples with before-after comparison images somewhere in our<br>
documentation?<br></blockquote><div><br></div><div>The only I know of is the vrt tutorial (with very few details), but you have probably already read that</div><div><br></div><div><a href="http://www.gdal.org/gdal_vrttut.html">http://www.gdal.org/gdal_vrttut.html</a></div>
<div><br></div><div>These refs may help (obtained through a simple google search)</div><div><br></div><div><a href="http://homepages.inf.ed.ac.uk/rbf/HIPR2/unsharp.htm">http://homepages.inf.ed.ac.uk/rbf/HIPR2/unsharp.htm</a><br>
</div><div><a href="http://stackoverflow.com/questions/2938162/how-does-an-unsharp-mask-work">http://stackoverflow.com/questions/2938162/how-does-an-unsharp-mask-work</a><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">

<br>
I also found that there are some python scripts included in<br>
\gdal\bin\gdal\python\scripts at least in the gisinternals GDAL builds but<br>
some scripts are not listed in <a href="http://gdal.org/gdal_utilities.html" target="_blank">http://gdal.org/gdal_utilities.html</a>.  Is<br>
there some other place where to find documentation about these scripts, for<br>
example gdal_calc.py ? Some other than the sources, I mean.<br>
<br>
-Jukka Rahkonen-<br>
<br>
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