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List:       grass-commit
Subject:    [GRASS-SVN] r70444 - grass/trunk/imagery/i.modis.qc
From:       svn_grass () osgeo ! org
Date:       2017-01-27 20:27:40
Message-ID: 20170127202740.537A9390091 () trac ! osgeo ! org
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Author: neteler
Date: 2017-01-27 12:27:40 -0800 (Fri, 27 Jan 2017)
New Revision: 70444

Modified:
   grass/trunk/imagery/i.modis.qc/i.modis.qc.html
Log:
i.modis.qc manual: added note on MOD11A2 QC_band NULLs treatment (contributed by \
veroandreo)

Modified: grass/trunk/imagery/i.modis.qc/i.modis.qc.html
===================================================================
--- grass/trunk/imagery/i.modis.qc/i.modis.qc.html	2017-01-27 20:13:33 UTC (rev \
                70443)
+++ grass/trunk/imagery/i.modis.qc/i.modis.qc.html	2017-01-27 20:27:40 UTC (rev \
70444) @@ -497,6 +497,18 @@
 standard QC (MOD09A1 in this module) since version 3, State-QA 500m images
 (MOD09A1s in this module) should be used (see Vermote et al., 2008).
 
+MOD11A2 quality control (QC) bands do not have a FillValue (No-data) according 
+to <a href="https://lpdaac.usgs.gov/dataset_discovery/modis/modis_products_table/mod11a2_v006">MODIS \
Land Products site</a>.  +However, the metadata of the QC bands (i.e.: <tt>gdalinfo \
QC_band</tt>) shows <tt>No-data=0</tt>.  +This value is then transformed into GRASS \
NULLs when data is imported though  +<a href="r.in.gdal.html">r.in.gdal</a>. Applying \
<em>i.modis.qc</em> on those QC bands +will not give the expected range of values in \
the different QC bits. Therefore,  +before using <em>i.modis.qc</em>, the user needs \
to set the NULL value in QC bands  +back to zero (i.e.: <tt>r.null map=QC_band \
null=0</tt>) or just edit the metadata with GDAL  +utilities before importing into \
GRASS GIS. This is a known issue for MOD11A2  +(8-day LST product), but other MODIS \
products might be affected as well. +
+
 <h2>TODO</h2>
 Add more daily products.
 

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