[GRASS-SVN] r56513 - grass/trunk/imagery/i.pca

[svn_grass at osgeo.org]

Author: mmetz
Date: 2013-05-30 07:51:54 -0700 (Thu, 30 May 2013)
New Revision: 56513

Modified:
   grass/trunk/imagery/i.pca/i.pca.html
Log:
i.pca: update manual

Modified: grass/trunk/imagery/i.pca/i.pca.html
===================================================================
--- grass/trunk/imagery/i.pca/i.pca.html	2013-05-30 14:36:35 UTC (rev 56512)
+++ grass/trunk/imagery/i.pca/i.pca.html	2013-05-30 14:51:54 UTC (rev 56513)
@@ -6,12 +6,18 @@
 raster map layers containing the principal components of
 the input data in decreasing order of variance
 ("contrast").  The output raster map layers are assigned
-names with .1, .2, ... .n suffixes.  The current geographic
-region definition and MASK settings are respected when
-reading the input raster map layers. When the rescale
-option is used, the output files are rescaled to fit the
-min,max range.
+names with .1, .2, ... .n suffixes. The numbers used as suffix 
+correspond to percent importance with .1 being the scores of the 
+principal component with the highest importance.
 
+<p>The current geographic region definition and MASK settings are 
+respected when reading the input raster map layers. When the rescale
+option is used, the output files are rescaled to fit the min,max range.
+
+<p>The order of the input bands does not matter for the output maps 
+(PC scores), but does matter for the vectors (loadings), since each 
+loading refers to a specific input band.
+
 <p>
 If the output is not rescaled (<em>rescale=0,0</em>, the output raster 
 maps will be of type DCELL, otherwise the output raster maps will be of