[GRASS-SVN] r70875 - grass/branches/releasebranch_7_2/raster/r.sunhours
svn_grass at osgeo.org
svn_grass at osgeo.org
Fri Apr 14 14:44:37 PDT 2017
Author: neteler
Date: 2017-04-14 14:44:36 -0700 (Fri, 14 Apr 2017)
New Revision: 70875
Modified:
grass/branches/releasebranch_7_2/raster/r.sunhours/r.sunhours.html
Log:
r.sunhours manual: fix broken example; clarify description
Modified: grass/branches/releasebranch_7_2/raster/r.sunhours/r.sunhours.html
===================================================================
--- grass/branches/releasebranch_7_2/raster/r.sunhours/r.sunhours.html 2017-04-14 21:43:40 UTC (rev 70874)
+++ grass/branches/releasebranch_7_2/raster/r.sunhours/r.sunhours.html 2017-04-14 21:44:36 UTC (rev 70875)
@@ -2,7 +2,8 @@
<em>r.sunhours</em> calculates sun elevation and sun azimuth angles for
the given time of day and each grid cell in the current region.
-Additionally, the photoperiod (sunshine hours) can be calculated.
+Additionally, the photoperiod (sunshine hours on flat terrain) can be
+calculated.
<p>
Sun elevation, height, height angle, or solar altitude angle is the
@@ -19,9 +20,13 @@
<p>
If a <em>sunhour</em> output map is specified, the module calculates
sunshine hours for the given day. This option requires both Greenwhich
-standard time (<em>-t</em> flag) and the solpos algorithm of NREL
-(<em>-s</em> flag).
+standard time and the use of the SOLPOS algorithm by NREL.
+<h2>NOTESS</h2>
+
+To consider also cast shadow effects of the terrain, <em>r.sun</em> is
+to be used.
+
<h2>EXAMPLES</h2>
<h3>Calculating a sun elevation angle map</h3>
@@ -47,10 +52,13 @@
<h3>Calculate map of photoperiod (insolation time)</h3>
-Calculate photoperiod of day of year 1 (1st January) 2012:
+Calculate photoperiod of day-of-year 001 (1st January) of 2012 for
+the current computational region, ignoring cast shadow effects of the
+terrain:
<div class="code"><pre>
-r.sunhours -s sunhour=photoperiod_doy_001 year=2012 day=1
+g.region -p
+r.sunhours sunhour=photoperiod_doy_001 year=2012 day=1
</pre></div>
<h2>Acknowledgements</h2>
@@ -62,7 +70,7 @@
<em>
<a href="g.region.html">g.region</a>,
<a href="r.sun.html">r.sun</a>,
-<a href="r.sunmask.html">r.sunmask</a>,
+<a href="r.sunmask.html">r.sunmask</a>
</em>
<h2>AUTHOR</h2>
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