DSGRID2S - primary single precision Fortran entry for 2D gridding

       To use DSGRID2S, load the NCAR Graphics library ngmath.

       Copyright (C) 2000
       University Corporation for Atmospheric Research

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

UNIX                                           September 1997-1998                              DSGRID2S(3NCARG)

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

       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.

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

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

       ZO          (Real, Output) -  A two-dimensional array of  dimension  NUMXOUT  x  NUMYOUT  containing  the
                   interpolated   functional   values.   ZO(I,J)   is  the  interpolated  value  at  grid  point
                   (XO(I),YO(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 dsgrid_errors for details.

       DSGRID2S - primary single precision Fortran entry for 2D gridding

       dsgrid, dsgrid_params, dsseti, dsgeti, dssetr, dsgetr, dssetc, dsgetc.

       Complete documentation for Dsgrid is available at URL
       http://ngwww.ucar.edu/ngdoc/ng/ngmath/dsgrid/dshome.html

       CALL DSGRID2S (NPNTS, X, Y, Z, NUMXOUT, NUMYOUT, XO, YO, ZO, IER)

       DSGRID2S  is  the  single precision gridding function for 2D data in the Dsgrid package.  The behavior of
       DSGRID2S is controlled by values set for the various parameters described in dsgrid_params.   Values  for
       these parameters can be set using the subroutines DSSETI, DSSETR, and DSSETC.

       In  almost  all cases the ngmath function NATGRIDS is superior to DSGRID2S for 2D interpolation.  See the
       man page for NATGRIDS for details.