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<div class="moz-cite-prefix">Hi Jaco<br>
<br>
On 11/03/2015 07:55, Hanlie Pretorius wrote:<br>
</div>
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cite="mid:CAFpCUPpmPaCJsG8OCDO2-ijL10Ld8OS+ksoMpj2Qph-JSCOZrA@mail.gmail.com"
type="cite">
<pre wrap="">Hi Jaco,
I didn't reply yesterday because I was hoping that someone with more
knowledge than I have, would.
I need some clarification before I can possibly help you.
1. What do you mean by 'make a radiation map'? What is the original
data source? I know of some people who have gotten irradiation data
for the whole of Africa off the Internet and then it's just a question
of displaying it.
Or is this also something that you are using your DEM for? Then I
would look at GRASS GIS's r.sun function -
<a class="moz-txt-link-freetext" href="http://grass.osgeo.org/grass64/manuals/r.sun.html">http://grass.osgeo.org/grass64/manuals/r.sun.html</a>.</pre>
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Yes that should do what you need. Note GRASS 7.0 has been released.<br>
<br>
More GRASS links:<br>
<a class="moz-txt-link-freetext" href="http://grass.osgeo.org/grass70/manuals/addons/r.sun.daily.html">http://grass.osgeo.org/grass70/manuals/addons/r.sun.daily.html</a><br>
<a class="moz-txt-link-freetext" href="http://grasswiki.osgeo.org/wiki/Energy_calculations">http://grasswiki.osgeo.org/wiki/Energy_calculations</a><br>
<br>
There's also
<a class="moz-txt-link-freetext" href="http://www.saga-gis.org/saga_module_doc/2.1.3/ta_lighting_2.html">http://www.saga-gis.org/saga_module_doc/2.1.3/ta_lighting_2.html</a>.
You can run SAGA standalone, command line or through QGIS. Or even
through R:
<a class="moz-txt-link-freetext" href="http://artax.karlin.mff.cuni.cz/r-help/library/RSAGA/html/rsaga.pisr.html">http://artax.karlin.mff.cuni.cz/r-help/library/RSAGA/html/rsaga.pisr.html</a><br>
<br>
Here's a worked example
<a class="moz-txt-link-freetext" href="https://darrenwiens.wordpress.com/tag/solar-radiation/">https://darrenwiens.wordpress.com/tag/solar-radiation/</a><br>
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cite="mid:CAFpCUPpmPaCJsG8OCDO2-ijL10Ld8OS+ksoMpj2Qph-JSCOZrA@mail.gmail.com"
type="cite">
<pre wrap="">
2. In my limited experience with creating DEMs it looks like your DEM
has a hole at the top and that is why your slope map does as well. I
think this has to do with defining soft and hard break lines when the
DEM is generated. What procedure did you follow to create your DEM
from the 5m contours?</pre>
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Yes please let us know what steps you used. <br>
<br>
Here's a nice worked example in GRASS:<br>
<a class="moz-txt-link-freetext" href="http://www.ing.unitn.it/~grass/docs/tutorial_641_en/htdocs/esercitazione/dtm/dtm1.html">http://www.ing.unitn.it/~grass/docs/tutorial_641_en/htdocs/esercitazione/dtm/dtm1.html</a><br>
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cite="mid:CAFpCUPpmPaCJsG8OCDO2-ijL10Ld8OS+ksoMpj2Qph-JSCOZrA@mail.gmail.com"
type="cite">
<pre wrap="">
</pre>
</blockquote>
Gavin<br>
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