[GRASS-SVN] r57197 - grass-addons/grass7/vector/v.surf.mass

[svn_grass at osgeo.org]

Author: neteler
Date: 2013-07-17 08:32:19 -0700 (Wed, 17 Jul 2013)
New Revision: 57197

Modified:
   grass-addons/grass7/vector/v.surf.mass/v.surf.mass.html
Log:
v.surf.mass: example expanded

Modified: grass-addons/grass7/vector/v.surf.mass/v.surf.mass.html
===================================================================
--- grass-addons/grass7/vector/v.surf.mass/v.surf.mass.html	2013-07-17 14:55:16 UTC (rev 57196)
+++ grass-addons/grass7/vector/v.surf.mass/v.surf.mass.html	2013-07-17 15:32:19 UTC (rev 57197)
@@ -16,7 +16,7 @@
 
 <h2>EXAMPLE</h2>
 
-<h3>Population count interpolation using annual precipitation in the 
+<h3>Pycnophylactic interpolation of Voronoi triangles using annual precipitation in the 
 North Carolina sample data</h3>
 
 <div class="code"><pre>
@@ -46,8 +46,22 @@
 # adjust precipitation: multiply by area size, dived by pixel size
 v.db.update map=precip_annual column=prec_adj qcolumn="annual * area / 25000000"
 
+# set North Carolina state as MASK for nicer raster output
+r.mapcalc "MASK = if(isnull(elev_state_500m), null(), 1)"
+
 # mass-preserving area interpolation
-v.surf.mass input=precip_annual output=precip_annual column=prec_adj iterations=200
+v.surf.mass input=precip_annual output=precip_annual_pycno column=prec_adj iterations=200
+
+# comparison
+v.to.rast precip_annual out=precip_annual_voronoi type=area use=attr attrcolumn=annual
+
+# remove MASK
+r.mask -r
+
+# verify results
+d.mon wx0
+d.rast.leg precip_annual_voronoi
+d.rast.leg precip_annual_pycno
 </pre></div>