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 interpolated values
       generated from a set of irregularly spaced data points using  numerical
       approximation  (weighted  averaging) 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 representation 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)
