1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
|
#include <stdio.h>
#include <stdlib.h>
#include "grib2.h"
g2int g2_unpack3(unsigned char *,g2int *,g2int **,g2int **,
g2int *,g2int **,g2int *);
g2int getdim(unsigned char *csec3,g2int *width,g2int *height,g2int *iscan)
//$$$ SUBPROGRAM DOCUMENTATION BLOCK
// . . . .
// SUBPROGRAM: getdim
// PRGMMR: Gilbert ORG: W/NP11 DATE: 2002-12-11
//
// ABSTRACT: This subroutine returns the dimensions and scanning mode of
// a grid definition packed in GRIB2 Grid Definition Section 3 format.
//
// PROGRAM HISTORY LOG:
// 2002-12-11 Gilbert
//
// USAGE: int getdim(unsigned char *csec3,g2int *width,
// g2int *height, g2int *iscan)
// INPUT ARGUMENT LIST:
// csec3 - Character array that contains the packed GRIB2 GDS
//
// OUTPUT ARGUMENT LIST:
// width - x (or i) dimension of the grid.
// height - y (or j) dimension of the grid.
// iscan - Scanning mode ( see Code Table 3.4 )
//
// REMARKS: Returns width and height set to zero, if grid template
// not recognized.
//
// ATTRIBUTES:
// LANGUAGE: C
// MACHINE: IBM SP
//
//$$$
{
g2int *igdstmpl,*list_opt;
g2int *igds;
g2int iofst,igdtlen,num_opt,jerr;
igdstmpl=0;
list_opt=0;
igds=0;
iofst=0; // set offset to beginning of section
jerr= g2_unpack3(csec3,&iofst,&igds,&igdstmpl,
&igdtlen,&list_opt,&num_opt);
if (jerr == 0) {
switch ( igds[4] ) // Template number
{
case 0: // Lat/Lon
case 1:
case 2:
case 3:
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[18];
break;
}
case 10: // Mercator
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[15];
break;
}
case 20: // Polar Stereographic
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[17];
break;
}
case 30: // Lambert Conformal
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[17];
break;
}
case 40: // Gaussian
case 41:
case 42:
case 43:
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[18];
break;
}
case 90: // Space View/Orthographic
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[16];
break;
}
case 110: // Equatorial Azimuthal
{
*width=igdstmpl[7];
*height=igdstmpl[8];
*iscan=igdstmpl[15];
break;
}
default:
{
*width=0;
*height=0;
*iscan=0;
break;
}
} // end switch
}
else {
*width=0;
*height=0;
}
if (igds != 0) free(igds);
if (igdstmpl != 0) free(igdstmpl);
if (list_opt != 0) free(list_opt);
return 0;
}
|
