imagery intro manual: mention i.eb.* and i.evapo.*

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@65808 15284696-431f-4ddb-bdfa-cd5b030d7da7

imagery/i.evapo.mh/i.evapo.mh.html

@@ -1,7 +1,7 @@
 <h2>DESCRIPTION</h2>
 
-<em>i.evapo.MH</em> Calculates the reference ET after Hargreaves (1985)
-and Modified Hargreaves (2001). 
+<em>i.evapo.mh</em> calculates the reference evapotranspiration (ET) after
+Hargreaves (1985) and the Modified Hargreaves (2001). 
 
 <!-- TODO Hargreaves (2001) citation missing! -->
 
@@ -15,14 +15,20 @@ and Modified Hargreaves (2001).
 </em>
 
 <h2>REFERENCES</h2>
-Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural benefits for
+
+<ul>
+<li> Hargreaves GL, Hargreaves GH, Riley JP, 1985. Agricultural benefits for
 Senegal River Basin. Journal of Irrigation and Drainange Engineering,
-ASCE, 111(2):113-124.
-<p>Droogers P, Allen RG, 2002. Towards a simplified global reference
-evapotranspiration equation. Irrigation Science.
-<p>Droogers, P., and R.G. Allen. 2002. Estimating reference evapotranspiration
-under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.
-<p>Hargreaves and Samani, 1985. <!-- incomplete -->
+ASCE, 111(2):113-124.</li>
+<li> Hargreaves, 2001 - incomplete</li>
+<li> Droogers P, Allen RG, 2002. Towards a simplified global reference
+evapotranspiration equation. Irrigation Science.</li>
+<li> Droogers, P., Allen RG. 2002. Estimating reference evapotranspiration
+under inaccurate data conditions. Irrigation and Drainage Systems 16: 33-45.</li>
+<li> Hargreaves GH, Samani ZA, 1985. Reference crop evapotranspiration from
+ ambient air temperature. American Society of Agricultural Engineers
+ (Microfiche collection)(USA). no. fiche no. 85-2517.</li>
+</ul>
 
 <h2>AUTHORS</h2>
 

imagery/i.evapo.pm/i.evapo.pm.html

@@ -1,6 +1,6 @@
 <h2>DESCRIPTION</h2>
 
-<p><em>i.evapo.PM</em>, given the vegetation height (hc), humidity (RU), 
+<p><em>i.evapo.pm</em>, given the vegetation height (hc), humidity (RU), 
 wind speed at two meters height (WS), temperature (T), digital terrain model (DEM), 
 and net radiation (NSR) raster input maps, 
 calculates the potential evapotranspiration map (EPo).

imagery/imageryintro.html

@@ -201,6 +201,34 @@ set of coregistered input maps such as multitemporal satellite
 data. The common univariate statistics and also linear regression can
 be calculated.
 
+<h3>Evapotranspiration modeling</h3>
+
+In GRASS, several types of evapotranspiration (ET) modeling methods
+are available:
+
+<ul>
+<li> Reference ET: Hargreaves (<a href="i.evapo.mh.html">i.evapo.mh</a>),
+                   Penman-Monteith (<a href="i.evapo.pm.html">i.evapo.pm</a>);</li>
+<li> Potential ET: Priestley-Taylor (<a href="i.evapo.pt.html">i.evapo.pt</a>);</li>
+<li> Actual ET: <a href="i.evapo.time.html">i.evapo.time</a>.</li>
+</ul>
+
+Evaporative fraction: <a href="i.eb.evapfr.html">i.eb.evapfr</a>,
+<a href="i.eb.hsebal01.html">i.eb.hsebal01</a>.
+
+<h3>Energy balance</h3>
+
+Emissivity can be calculated with <a href="i.emissivity.html">i.emissivity</a>.
+
+Several modules support the calculation of the energy balance:
+<ul>
+<li> Actual evapotranspiration for diurnal period  (<a href="i.eb.eta.html">i.eb.eta</a>);</li>
+<li> Evaporative fraction and root zone soil moisture (<a href="i.eb.evapfr.html">i.eb.evapfr</a>);</li>
+<li> Sensible heat flux iteration (<a href="i.eb.hsebal01.html">i.eb.hsebal01</a>);</li>
+<li> Net radiation approximation (<a href="i.eb.netrad.html">i.eb.netrad</a>);</li>
+<li> Soil heat flux approximation (<a href="i.eb.soilheatflux.html">i.eb.soilheatflux</a>).</li>
+</ul>
+
 <h3>See also</h3>
 
 <ul>