s.vol.idw(1)	       Grass User's Manual	     s.vol.idw(1)



NNAAMMEE
       ss..vvooll..iiddww  - Interpolates point data to a 3D grid.
       _(_G_R_A_S_S _3_D _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       ss..vvooll..iiddww

       ss..vvooll..iiddww hheellpp

       ss..vvooll..iiddww     iinnppuutt==_n_a_m_e    oouuttppuutt==_n_a_m_e	  [[nnppooiinnttss==_c_o_u_n_t]]
       [[ffiieelldd==_v_a_l_u_e]]

DDEESSCCRRIIPPTTIIOONN
       _s_._v_o_l_._i_d_w fills a GRID3D raster volume matrix with  inter-
       polated	values generated from a set of irregularly spaced
       data points using numerical approximation (weighted  aver-
       aging)  techniques.  The  interpolated  value of a tile is
       determined by values of nearby data points  and	the  dis-
       tance  of the cell from those input points.  In comparison
       with other methods, numerical approximation allows  repre-
       sentation of more complex volumes (particularly those with
       anomalous features), restricts the  spatial  influence  of
       any errors, and generates the interpolated volume from the
       data points.

   PPaarraammeetteerrss::
       iinnppuutt  Name of input 3D sites file

       oouuttppuutt Name of output 3D - G3D raster file

       nnppooiinnttss
	      Number of interpolation points Default: 12

       ffiieelldd  Number of z-field attribute to use for  calculation
	      default: 1


NNOOTTEESS
       If  two	or  more sites fall into one voxel, the last site
       value will determine the 3dcell value (no warning yet).

SSEEEE AALLSSOO
       _s_._v_o_l_._r_s_t_, _s_._t_o_._r_a_s_t_3


AAUUTTHHOORR
       Jaro Hofierka hofierka@geomodel.sk

       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_1_/_2_5 _0_5_:_4_5_:_3_5 _$



GRASS 5.0					     s.vol.idw(1)
