NAME

       Natgrid is a package for gridding 2D randomly-spaced data using a natural neighbor
       algorithm.  Single precison and double precision interfaces exist in both Fortran and C.

SYNOPSIS

       FORTRAN single precision
       ------------------------

        NATGRIDS     -  primary function for gridding.
        NNSETI       -  set INTEGER parameter values.
        NNGETI       -  retrieve values for INTEGER parameters.
        NNSETR       -  set REAL parameter values.
        NNGETR       -  retrieve values for REAL parameters.
        NNSETC       -  set CHARACTER valued parameters.
        NNGETC       -  retrieve values for CHARACTER parameters.
        NNGETSLOPES  -  get slope values, if calculated.
        NNGETASPECTS -  get aspect values, if calculated.
        NNPNTINITS   -  initiate single point mode.
        NNPNTS       -  interpolate at a single point.
        NNPNTEND     -  terminate single point mode.

       Fortran double precision (not supported on UNICOS):
       --------------------------------------------------

        NATGRIDD     -  primary function for gridding.
        NNSETI       -  set INTEGER parameter values.
        NNGETI       -  retrieve values for INTEGER parameters.
        NNSETRD      -  set DOUBLE PRECISION parameter values.
        NNGETRD      -  retrieve DOUBLE PRECISION parameters.
        NNSETC       -  set CHARACTER valued parameters.
        NNGETC       -  retrieve values for CHARACTER parameters.
        NNGETSLOPED  -  get slope values, if calculated.
        NNGETASPECTD -  get aspect values, if calculated.
        NNPNTINITD   -  initiate single point mode.
        NNPNTD       -  interpolate at a single point.
        NNPNTENDD    -  terminate single point mode.

       C single precision:
       ------------------

        c_natgrids     -  primary function for gridding.
        c_nnseti       -  set int parameter values.
        c_nngeti       -  retrieve values for int parameters.
        c_nnsetr       -  set float parameter values.
        c_nngetr       -  retrieve values for float parameters.
        c_nnsetc       -  set char valued parameters.
        c_nngetc       -  retrieve values for char parameters.
        c_nngetslopes  -  get slope values, if calculated.
        c_nngetaspects -  get aspect values, if calculated.
        c_nnpntinits   -  initiate single point mode.
        c_nnpnts       -  interpolate at a single point.
        c_nnpntend     -  terminate single point mode.

       C double precision:
       ------------------

        c_natgridd     -  primary function for gridding.
        c_nnseti       -  set int parameter values.
        c_nngeti       -  retrieve values for int parameters.
        c_nnsetrd      -  set double parameter values.
        c_nngetrd      -  retrieve values for double parameters.
        c_nnsetc       -  set char valued parameters.
        c_nngetc       -  retrieve values for char parameters.
        c_nngetsloped  -  get slope values, if calculated.
        c_nngetaspectd -  get aspect values, if calculated.
        c_nnpntinitd   -  initiate single point mode.
        c_nnpntd       -  interpolate at a single point.
        c_nnpntendd    -  terminate single point mode.

ACCESS

       To use Natgrid entries, load the NCAR Graphics library ngmath.

SEE ALSO

       Individual entries, natgrid_params, natgrid_errors.

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

       An NCL (NCAR Command Language) interface also exists for Natgrid procedures.

COPYRIGHT

       Copyright (C) 2000
       University Corporation for Atmospheric Research

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