g.bands and i.band manual: explain supported sensors (#1415)

adds list of currently supported multispectral sensors to manual

scripts/g.bands/g.bands.html

@@ -1,7 +1,73 @@
 <h2>DESCRIPTION</h2>
 
-Prints available band references information of multispectral data
-defined by GRASS GIS.
+<em>g.bands</em> prints available band references information of multispectral data
+defined by GRASS GIS. The following multispectral sensors are supported
+by default (other band reference registry files can be added, see below):
+
+<p>
+Generic multispectral system:
+<ul>
+<li>gen_r Visible red</li>
+<li>gen_g Visible green</li>
+<li>gen_b Visible blue</li>
+<li>gen_pan Visible panchromatic</li>
+<li>gen_nir Near infrared</li>
+</ul>
+<p>
+Landsat-5:
+<ul>
+<li>L5_1 Visible (Blue)</li>
+<li>L5_2 Visible (Green)</li>
+<li>L5_3 Visible (Red)</li>
+<li>L5_4 Near-Infrared</li>
+<li>L5_5 Short-wave infrared</li>
+<li>L5_6 Thermal</li>
+<li>L5_7 Short-wave infrared</li>
+</ul>
+<p>
+Landsat-7:
+<ul>
+<li>L7_1 Visible (Blue)</li>
+<li>L7_2 Visible (Green)</li>
+<li>L7_3 Visible (Red)</li>
+<li>L7_4 Near-Infrared</li>
+<li>L7_5 Near-Infrared</li>
+<li>L7_6 Thermal</li>
+<li>L7_7 Mid-Infrared</li>
+<li>L7_8 Panchromatic</li>
+</ul>
+<p>
+Landsat-8:
+<ul>
+<li>L8_1 Visible (Coastal/Aerosol)</li>
+<li>L8_2 Visible (Blue)</li>
+<li>L8_3 Visible (Green)</li>
+<li>L8_4 Visible (Red)</li>
+<li>L8_5 Near-Infrared</li>
+<li>L8_6 SWIR 1</li>
+<li>L8_7 SWIR 2</li>
+<li>L8_8 Panchromatic</li>
+<li>L8_9 Cirrus</li>
+<li>L8_10 TIRS 1</li>
+<li>L8_11 TIRS 1</li>
+</ul>
+<p>
+Sentinel-2:
+<ul>
+<li>S2_1 Visible (Coastal/Aerosol)</li>
+<li>S2_2 Visible (Blue)</li>
+<li>S2_3 Visible (Green)</li>
+<li>S2_4 Visible (Red)</li>
+<li>S2_5 Vegetation Red Edge 1</li>
+<li>S2_6 Vegetation Red Edge 2</li>
+<li>S2_7 Vegetation Red Edge 3</li>
+<li>S2_8 Near-Infrared</li>
+<li>S2_8A Narrow Near-Infrared</li>
+<li>S2_9 Water vapour</li>
+<li>S2_10 SWIR - Cirrus</li>
+<li>S2_11 SWIR 1</li>
+<li>S2_12 SWIR 2</li>
+</ul>
 
 <p>
 Band references to be printed can be filtered by a search pattern (or
@@ -12,7 +78,8 @@ <h2>DESCRIPTION</h2>
 default, <em>g.bands</em> prints all available band references.
 
 <p>
-Extended metadata is printed only when <b>-e</b> flag is given.
+Extended metadata (central wavelength, spatial resolution, etc.) is printed
+only when the <b>-e</b> flag is given.
 
 <h2>NOTES</h2>
 

scripts/i.band/i.band.html

@@ -17,14 +17,17 @@ <h2>NOTES</h2>
 Note that <i>only raster maps from the current mapsets</i> can be modified.
 
 <p>
-For more information about band reference concept
-see <em><a href="g.bands.html">g.bands</a></em> module.
+For more information about band reference concept and supported sensors
+(generic multispectral system, Landsat-5, Landsat-7, Landsat-8, Sentinel-2)
+see the <em><a href="g.bands.html">g.bands</a></em> module.
 
-<p>Band references are supported by temporal GRASS modules. Name of
+<p>
+Band references are supported by temporal GRASS modules. Name of
 STRDS can be extended by band identifier in order to filter the result
 by a band reference. See
 <em><a href="t.register.html#support-for-band-references">t.register</a></em>,
-<em><a href="t.rast.list.html#filtering-the-result-by-band-references">t.rast.list</a></em>, <em><a href="t.info.html#space-time-dataset-with-band-references-assigned">t.info</a></em>
+<em><a href="t.rast.list.html#filtering-the-result-by-band-references">t.rast.list</a></em>,
+<em><a href="t.info.html#space-time-dataset-with-band-references-assigned">t.info</a></em>
 and <em><a href="t.rast.mapcalc.html#band-reference-filtering">t.rast.mapcalc</a></em>
 modules for examples.