1CSSGRIDD(3NCARG)                 NCAR GRAPHICS                CSSGRIDD(3NCARG)
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NAME

6       CSSGRIDD - tension spline interpolation on a sphere.
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SYNOPSIS

9       CALL CSSGRIDD (N, RLAT, RLON, F, NI, NJ, PLAT, PLON, FF, IWK, RWK, IER)
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DESCRIPTION

12       N           (integer,input) The number of input data points (N > 2).
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14       RLAT        (double precision, input) An array containing the latitudes
15                   of the input data, expressed in degrees.  The  first  three
16                   points  must  not  be collinear (lie on a common great cir‐
17                   cle).
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19       RLON        (double precision, input) An array  containing  the  longi‐
20                   tudes of the input data, expressed in degrees.
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22       F           (double  precision, input) An array containing data values.
23                   F(I) is a functional value at (RLAT(I),RLON(I)) for I  =  1
24                   to N.
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26       NI          (integer,  input)  The number of rows in the uniform output
27                   grid. NI can be 1.
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29       NJ          (integer, input) The number of columns in the uniform  out‐
30                   put grid. NJ can be 1.
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32       PLAT        (double precision, intput) An array of length NI containing
33                   the latitudes the output grid lines.  The  values  in  PLAT
34                   should be in degrees.
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36       PLON        (double precision, intput) An array of length NJ containing
37                   the longitudes the output grid lines.  The  value  in  PLON
38                   should be in degrees.
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40       FF          (double precision, output) An NI by NJ array containing the
41                   desired interpolated values. FF(I,J)  is  the  interpolated
42                   value  at  the  coordinate specified by PLAT(I) and PLON(J)
43                   for I = 1 to NI and J = 1 to NJ.
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45       IWK         (integer, input) An integer workspace of length 27*N.
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47       RWK         (double precision, input)  A  work  array  dimensioned  for
48                   13*N.  Note that RWK must be typed DOUBLE PRECISION.
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50       IER         (integer,  output)  An  error  return  value.   If  IER  is
51                   returned as 0, then no errors were detected. If IER is non-
52                   zero,  then  refer  to  the man page for cssgrid_errors for
53                   details.
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USAGE

56       CSSGRIDD is called to find an interpolating  tension  spline  for  data
57       randomly  positioned  on a sphere.  CSSGRIDD is a double precision ver‐
58       sion of CSSGRID.
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ACCESS

61       To use CSSGRIDD, load the NCAR Graphics library ngmath.
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SEE ALSO

64       css_overview, csstri, cssgrid, cssgrid_errors
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66       Complete documentation for Cssgrid is available at URL
67       http://ngwww.ucar.edu/ngdoc/ng/ngmath/cssgrid/csshome.html
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70       Copyright (C) 2000
71       University Corporation for Atmospheric Research
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73       This documentation is free software; you  can  redistribute  it  and/or
74       modify  it  under  the  terms of the GNU General Public License as pub‐
75       lished by the  Free  Software  Foundation;  either  version  2  of  the
76       License, or (at your option) any later version.
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78       This  software  is  distributed in the hope that it will be useful, but
79       WITHOUT ANY  WARRANTY;  without  even  the  implied  warranty  of  MER‐
80       CHANTABILITY  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
81       Public License for more details.
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83       You should have received a copy of the GNU General Public License along
84       with  this  software;  if  not,  write to the Free Software Foundation,
85       Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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90UNIX                               MAY 2000                   CSSGRIDD(3NCARG)
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