[GRASS-SVN] r66997 - grass/trunk/raster/r.sun

[svn_grass at osgeo.org]

Author: neteler
Date: 2015-12-01 08:40:35 -0800 (Tue, 01 Dec 2015)
New Revision: 66997

Modified:
   grass/trunk/raster/r.sun/r.sun.html
Log:
r.sun manual: better reflect shadow calculation default setting

Modified: grass/trunk/raster/r.sun/r.sun.html
===================================================================
--- grass/trunk/raster/r.sun/r.sun.html	2015-12-01 15:57:51 UTC (rev 66996)
+++ grass/trunk/raster/r.sun/r.sun.html	2015-12-01 16:40:35 UTC (rev 66997)
@@ -6,10 +6,10 @@
 extraterrestrial irradiance, daylight length) are stored in the resultant maps'
 history files. Alternatively, the local time can be specified to compute solar
 incidence angle and/or irradiance raster maps. The shadowing effect of the
-topography is optionally incorporated. This can be done either by calculating
-the shadowing effect directly from the digital elevation model or using rasters
-of the horizon height which is much faster. The horizon rasters can be
-constructed using  <a href="r.horizon.html">r.horizon</a>.
+topography is incorporated by default. This can be done either internally by
+calculatoion of the shadowing effect directly from the digital elevation model
+or by specifying raster maps of the horizon height which is much faster. These
+horizon raster maps can be calculated using <a href="r.horizon.html">r.horizon</a>.
 <p>For latitude-longitude coordinates it requires that the elevation map is in meters.
 The rules are:
 <ul>
@@ -33,8 +33,9 @@
 to fulfil user needs in various fields of science (hydrology, climatology,
 ecology and environmental sciences, photovoltaics, engineering, etc.) for
 continental, regional up to the landscape scales. 
-<p>As an option the model considers a shadowing effect of the local topography. 
-The r.sun program works in two modes. In the first mode it calculates for the set 
+<p>The model considers a shadowing effect of the local topography unless switched
+off with the <em>-p</em> flag.
+<b>r.sun</b> works in two modes: In the first mode it calculates for the set 
 local time a solar incidence angle [degrees] and solar irradiance values [W.m-2].
 In the second mode daily sums of solar radiation [Wh.m-2.day-1] are computed
 within a set day. By a scripting the two modes can be used separately or
@@ -221,7 +222,7 @@
 END OF WE DON'T KNOW 
 -->
 
-<h3>Shadow maps</h3>
+<h3>Extraction of shadow maps</h3>
 A map of shadows can be extracted from the solar incidence angle map
 (incidout). Areas with zero values are shadowed. This will not work
 if the <em>-p</em> flag has been used.