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lines changed Original file line number Diff line number Diff line change @@ -1606,15 +1606,19 @@ def viewshed(raster: xarray.DataArray,
16061606    observer_elev : float 
16071607        Observer elevation above the terrain. 
16081608    target_elev : float 
1609-         Target elevation offset above the terrain. 
1609+         Target elevation offset above the terrain, which is the height 
1610+         in surface units to be added to the z-value of each pixel 
1611+         when it is being analyzed for visibility. 
16101612
16111613    Returns 
16121614    ------- 
16131615    viewshed: xarray.DataArray 
16141616        A cell x in the visibility grid is recorded as follows: 
16151617        If it is invisible, then x is set to INVISIBLE. 
16161618        If it is visible,  then x is set to the vertical angle w.r.t 
1617-         the viewpoint. 
1619+         the viewpoint. The value returned is in [0, 180]. A value of 0 is 
1620+         directly below the specified viewing position, 
1621+         90 is due horizontal, and 180 is directly above the observer. 
16181622
16191623    Examples 
16201624    -------- 
 
 
   
 
     
   
   
          
    
    
     
    
      
     
     
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