NAME

       NATGRIDS - primary single precision Fortran entry for natural neighbor gridding

SYNOPSIS

       CALL NATGRIDS (NPNTS, X, Y, Z, NUMXOUT, NUMYOUT, XI, YI, ZI, IER)

DESCRIPTION

       NPNTS       (Integer, Input) - The number of input data points. (NPNTS > 3).

       X           (Real,  Input)  -  An  array  containing  the  X coordinates of the input data
                   points.

       Y           (Real, Input) - An array containing  the  Y  coordinates  of  the  input  data
                   points.

       Z           (Real,  Input)  -  An array containing the functional values of the input data
                   points. That is, Z(L) is  the  value  of  the  input  function  at  coordinate
                   (X(L),Y(L)), for L=1,NPNTS.

       NUMXOUT     (Integer, Input) - The number of X values in the output grid.

       NUMYOUT     (Integer, Input) - The number of Y values in the output grid.

       XI          (Real,  Input) - An array of dimension NUMXOUT containing the X coordinates of
                   the output data grid. The values in XI must be increasing,  but  need  not  be
                   equally spaced.

       YI          (Real,  Input) - An array of dimension NUMYOUT containing the Y coordinates of
                   the output data grid. The values in YI must be increasing,  but  need  not  be
                   equally spaced.

       ZI          (Real,  Output)  -   A  two-dimensional  array  of dimension NUMXOUT x NUMYOUT
                   containing the interpolated functional values.  ZI(I,J)  is  the  interpolated
                   value at grid point (XI(I),YI(J)).

       IER         (Integer,  Output)  -  An error return value. If IER is returned as 0, then no
                   errors were detected. If IER is non-zero, then  refer  to  the  man  page  for
                   natgrid_errors for details.

USAGE

       NATGRIDS  is  the single precision gridding function in the Natgrid package.  The behavior
       of NATGRIDS  is  controlled  by  values  set  for  the  various  parameters  described  in
       natgrid_params.   Values  for  these  parameters  can be set using the subroutines NNSETI,
       NNSETR, and NNSETC.

ACCESS

       To use NATGRIDS, load the NCAR Graphics library ngmath.

SEE ALSO

       natgrid, natgrid_params, nnseti, nngeti, nnsetr, nngetr, nnsetc, nngetc.

       Complete documentation for Natgrid is available at URL
       http://ngwww.ucar.edu/ngdoc/ng/ngmath/natgrid/nnhome.html

COPYRIGHT

       Copyright (C) 2000
       University Corporation for Atmospheric Research

       The use of this Software is governed by a License Agreement.