[GRASS-SVN] r44874 - grass-promo/tutorials/grass_modis

[svn_grass at osgeo.org]

Author: ychemin
Date: 2011-01-04 15:06:54 -0800 (Tue, 04 Jan 2011)
New Revision: 44874

Modified:
   grass-promo/tutorials/grass_modis/article_GIPE.tex
Log:
Updated MCD43B3/B2 Quality processing info

Modified: grass-promo/tutorials/grass_modis/article_GIPE.tex
===================================================================
--- grass-promo/tutorials/grass_modis/article_GIPE.tex	2011-01-04 22:43:43 UTC (rev 44873)
+++ grass-promo/tutorials/grass_modis/article_GIPE.tex	2011-01-04 23:06:54 UTC (rev 44874)
@@ -139,7 +139,26 @@
 done
 \end{smallverbatim}
 
+When Dealing with BRDF-Corrected Albedo product (i.e. MCD43B3), a complement quality product should be downloaded, MCD43B2. This product has two Sub-Datasets (SDS) that are not bit-packed, therefore can be read directly but r.mapcalc. These SDS are \textit{BRDF\_Albedo\_Quality} and \textit{Snow\_BRDF\_Albedo}.
 
+\begin{smallverbatim}
+BRDF_Albedo_Quality
+-------------------
+ Value 0: Processed, good quality \
+    (full BRDF inversion) 
+ Value 1: Processed, see other QA \
+    (magnitude BRDF inversions)
+ Value 255: Fill Value
+\end{smallverbatim}
+
+\begin{smallverbatim}
+Snow_BRDF_Albedo
+----------------
+ Value 0: Snow-free albedo retrieved  
+ Value 1: Snow albedo retrieved 
+ Value 255: Fill Value
+\end{smallverbatim}
+
 \address{GRASS Development Team\\
   \url{http://grass.osgeo.org}\\
   \email{tmitchell at osgeo.org}}