[GRASS-SVN] r43452 - grass-addons/imagery/i.landsat.acca

[svn_grass at osgeo.org]

Author: hamish
Date: 2010-09-13 01:11:18 +0000 (Mon, 13 Sep 2010)
New Revision: 43452

Modified:
   grass-addons/imagery/i.landsat.acca/description.html
Log:
mention toAR must be run first, some tweaks to the English

Modified: grass-addons/imagery/i.landsat.acca/description.html
===================================================================
--- grass-addons/imagery/i.landsat.acca/description.html	2010-09-13 01:05:05 UTC (rev 43451)
+++ grass-addons/imagery/i.landsat.acca/description.html	2010-09-13 01:11:18 UTC (rev 43452)
@@ -2,8 +2,10 @@
 
 <EM>i.landsat.acca</EM> implements the Automated Cloud-Cover Assessment
 (ACCA) Algorithm from Irish (2000) with the constant values for pass filter
-one from Irish et al. (2006). To do, it need the band numbers 2, 3, 4, 5,
-and 6 (band 61 of Landsat-7 ETM+).
+one from Irish et al. (2006). To do this, it needs the band numbers 2, 3,
+4, 5, and 6 (or band 61 for Landsat-7 ETM+) which have already been
+processed from DN into reflectance and band-6 temperature (for example with
+<em>i.landsat.toar</em>).
 
 <p>
 The ACCA gives good results over most of the planet with the exception of
@@ -12,26 +14,27 @@
 but because of they use reflectances it usefull also for Landsat-4/5 TM.
 
 
-
 <H2>NOTES</H2>
 
-<em>i.landsat.acca</em> use full raster and it do not take account the
-current region.
+<em>i.landsat.acca</em> works on the full raster, thus it does not take
+account the current region settings. <!-- this may have to change before the
+module can be added to the main source archive -->
 
+
 <H2>EXAMPLES</H2>
 
-To make standard ACCA algorithm with two pass processing (flag 2) and
-filling cloud holes (flag f).
+To run the standard ACCA algorithm with two pass processing (the <b>-2</b> flag)
+and filling cloud holes (the <b>-f</b> flag):
 <p>
-Reflectances in band rasters 226_62.toar.1, 226_62.toar.2 [...] and thermal
-band 226_62.toar.61 to output file 226_62.acca:
+With per-band reflectance raster maps named <tt>226_62.toar.1,
+226_62.toar.2, </tt> [...] and LANDSAT-7 thermal band <tt>226_62.toar.61</tt>,
+outputing to a new raster map named <tt>226_62.acca</tt>:
 
 <div class="code"><pre>
-i.landsat.acca -f2 band=226_62.toar out=226_62.acca
+i.landsat.acca -2 -f band_prefix=226_62.toar output=226_62.acca
 </pre></div>
 
 
-
 <H2>REFERENCES</H2>
 <ol>
     <li>Irish R.R., Barker J.L., Goward S.N., and Arvidson T., 2006.