1CPSPS2(3NCARG) NCAR GRAPHICS CPSPS2(3NCARG)
2
6 CPSPS2 - Interpolates from an array of data on a "sparse" rectangular
7 grid which is irregularly spaced in X and Y to an array of data on a
8 "dense" rectangular grid and initializes contouring from the array on
9 the dense grid. (By a "sparse" grid is meant one whose dimensions are
10 smaller than one would like, so that contour lines constructed directly
11 on it are composed of long straight segments.) CPSPS2 may be viewed as
12 a data smoothing routine.
13
15 CALL CPSPS2 (XSPS, YSPS, ZSPS, KSPS, MSPS, NSPS, RWRK,
16 + LRWK, IWRK, LIWK, ZDAT, LZDT)
17
19 #include <ncarg/ncargC.h>
20 void c_cpsps2 (float *xsps, float *ysps, float *zsps,
22 int ksps, int msps, int nsps, float *rwrk, int lrwk,
23 int *iwrk, int liwk, float *zdat, int lzdt)
24
26 XSPS (REAL array, dimensioned MSPS) is the array of X
27 coordinates of the irregular rectangular grid. These must
28 be in strictly increasing numerical order.
29 YSPS (REAL array, dimensioned NSPS) is the array of Y
31 coordinates of the irregular rectangular grid. These must
32 be in strictly increasing numerical order.
33 ZSPS (REAL array, dimensioned KSPS x n, where "n" is greater
35 than or equal to NSPS, input) is the "sparse" array of
36 data, from which the "dense" array is to be generated.
37 KSPS (INTEGER, input) is the first dimension of the array ZSPS.
39 MSPS (INTEGER, input) is the first dimension of the "sparse"
41 array of data in ZSPS. MSPS must be less than or equal to
42 KSPS.
43 NSPS (INTEGER, input) is the second dimension of the "sparse"
45 array of data in ZSPS. NSPS must be less than or equal to
46 the declared second dimension of the array ZSPS.
47 RWRK (REAL array, dimensioned LRWK, input/output) is the real
49 work array.
50 LRWK (INTEGER, input) is the length of RWRK.
52 IWRK (INTEGER array, dimensioned LIWK, input/output) is the
54 integer work array.
55 LIWK (INTEGER, input) is the length of IWRK.
57 ZDAT (REAL array, dimensioned LZDT, output) is the array in
59 which the interpolated "dense" array of data is to be
60 returned. The dimensions of the interpolated array may be
61 supplied by the user or determined by Conpack, depending on
62 the value of the parameter 'ZDS'. Note that, if Conpack
63 determines the dimensions of the "dense" array, it will
64 attempt to use an aspect ratio which is close to that
65 implied by the value of the ratio
66 (XSPS(MSPS)-XSPS(1))/(YSPS(NSPS)-YSPS(1))
68 LZDT (INTEGER, input) is the length of ZDAT.
70
72 The C-binding argument descriptions are the same as the FORTRAN
73 argument descriptions, with the following exceptions:
74 zsps(l,ksps)
77 Dimensioned l by ksps, where l ≤ nsps.
78 ksps The second dimension of the array zsps.
80 msps The second dimension of the sparse array of data in zsps.
82 msps ≤ ksps.
83 nsps The first dimension of the sparse array of data in zsps.
85 nsps ≤ l, the declared first dimension of the array zsps.
86
88 CPSPS2 performs the same functions as CPRECT, but, in addition, it
89 interpolates from a sparse array of data to a dense array of data.
90 CPSPS2 does this by using the routines SURF1 and SURF2, from the
91 package Fitpack, by Alan K. Cline, to fit bicubic splines under tension
92 to the sparse array of data and to compute the dense grid of data that
93 is returned to you. The tension on the spline surfaces is specified by
94 the parameter 'T3D'. By default, CPSPS2 selects the dimensions of the
95 dense array of data; if desired, you can specify these dimensions by
96 setting the parameter 'ZDS' non-zero and the parameters 'ZD1', 'ZDM',
97 and 'ZDN' to the desired values. In either case, once 'ZD1', 'ZDM', and
98 'ZDN' are set, they should not be reset by you until the contour plot
99 is complete and a different contour plot is to be drawn.
100 Because the routines SURF1 and SURF2 do not have a built-in special
102 value feature, if the special value parameter 'SPV' is set non-zero and
103 the sparse array contains occurrences of that value, special action
104 must be taken. The indices of the special values in the sparse array
105 are saved in a part of the integer workspace array; the special values
106 are then replaced by values interpolated from adjacent grid points and
107 the resulting array is used to obtain the dense array; then, the
108 special values in the sparse array are restored and the corresponding
109 elements of the dense array are also given the special value.
110
112 Use the ncargex command to see the following relevant example: ccpsps2.
113
115 To use CPSPS2 or c_cpsps2, load the NCAR Graphics libraries ncarg,
116 ncarg_gks, and ncarg_c, preferably in that order.
117
119 See the conpack man page for a description of all Conpack error
120 messages and/or informational messages.
121
123 Online: conpack, cpback, cpchcf, cpchcl, cpchhl, cpchil, cpchll,
124 cpcica, cpclam, cpcldm, cpcldr, cpcltr, cpcnrc, cpdrpl, cpezct, cpgetc,
125 cpgeti, cpgetr, cplbam, cplbdr, cpmpxy, cpmviw, cpmvrw, cppkcl, cppklb,
126 cprect, cprset, cpscae, cpsetc, cpseti, cpsetr, cpsps1, ncarg_cbind
127 Hardcopy: NCAR Graphics Contouring and Mapping Tutorial
129
131 Copyright (C) 1987-2009
132 University Corporation for Atmospheric Research
133 The use of this Software is governed by a License Agreement.
135UNIX March 1993 CPSPS2(3NCARG)