[GRASS-SVN] r44848 - grass-promo/tutorials/grass_landsat_ETa

[svn_grass at osgeo.org]

Author: ychemin
Date: 2011-01-03 16:48:39 -0800 (Mon, 03 Jan 2011)
New Revision: 44848

Modified:
   grass-promo/tutorials/grass_landsat_ETa/article_GIPE.tex
Log:
Added Energy Balance Intro

Modified: grass-promo/tutorials/grass_landsat_ETa/article_GIPE.tex
===================================================================
--- grass-promo/tutorials/grass_landsat_ETa/article_GIPE.tex	2011-01-03 23:58:16 UTC (rev 44847)
+++ grass-promo/tutorials/grass_landsat_ETa/article_GIPE.tex	2011-01-04 00:48:39 UTC (rev 44848)
@@ -515,6 +515,11 @@
 
 
 \section{Energy balance terms}
+The energy-balance models use visible, infrared and thermal remotely sensed data for solving the main equation:\newline
+\begin{center}
+Rn-G-H-$\lambda$ET=0 \newline
+\end{center}
+Where the Rn is the net radiation, H is the sensible heat flux, G is the soil heat flux, and $\lambda$ET is the latent heat flux.\newline
 \subsection{Net Radiation}
 Net radiation at satellite overpass (instantaneous) and integrated over the day are computed from a generic GRASS GIS raster module "r.sun". 
 The r.sun program works in two modes. In the first mode it calculates for the image acquisition 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 day.\newline