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
128
129
130
|
#define PJ_LIB__
#include <projects.h>
PROJ_HEAD(goode, "Goode Homolosine") "\n\tPCyl, Sph.";
#define Y_COR 0.05280
#define PHI_LIM 0.71093078197902358062
C_NAMESPACE PJ *pj_sinu(PJ *), *pj_moll(PJ *);
struct pj_opaque {
PJ *sinu;
PJ *moll;
};
static XY s_forward (LP lp, PJ *P) { /* Spheroidal, forward */
XY xy = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
if (fabs(lp.phi) <= PHI_LIM)
xy = Q->sinu->fwd(lp, Q->sinu);
else {
xy = Q->moll->fwd(lp, Q->moll);
xy.y -= lp.phi >= 0.0 ? Y_COR : -Y_COR;
}
return xy;
}
static LP s_inverse (XY xy, PJ *P) { /* Spheroidal, inverse */
LP lp = {0.0,0.0};
struct pj_opaque *Q = P->opaque;
if (fabs(xy.y) <= PHI_LIM)
lp = Q->sinu->inv(xy, Q->sinu);
else {
xy.y += xy.y >= 0.0 ? Y_COR : -Y_COR;
lp = Q->moll->inv(xy, Q->moll);
}
return lp;
}
static void *freeup_new (PJ *P) { /* Destructor */
if (0==P)
return 0;
if (0==P->opaque)
return pj_dealloc(P);
if (P->opaque->sinu)
pj_dealloc(P->opaque->sinu);
if (P->opaque->moll)
pj_dealloc(P->opaque->moll);
pj_dealloc (P->opaque);
return pj_dealloc(P);
}
static void freeup (PJ *P) {
freeup_new (P);
return;
}
PJ *PROJECTION(goode) {
struct pj_opaque *Q = pj_calloc (1, sizeof (struct pj_opaque));
if (0==Q)
return freeup_new (P);
P->opaque = Q;
P->es = 0.;
if (!(Q->sinu = pj_sinu(0)) || !(Q->moll = pj_moll(0)))
E_ERROR_0;
Q->sinu->es = 0.;
Q->sinu->ctx = P->ctx;
Q->moll->ctx = P->ctx;
if (!(Q->sinu = pj_sinu(Q->sinu)) || !(Q->moll = pj_moll(Q->moll)))
E_ERROR_0;
P->fwd = s_forward;
P->inv = s_inverse;
return P;
}
#ifndef PJ_SELFTEST
int pj_goode_selftest (void) {return 0;}
#else
int pj_goode_selftest (void) {
double tolerance_lp = 1e-10;
double tolerance_xy = 1e-7;
char s_args[] = {"+proj=goode +a=6400000 +lat_1=0.5 +lat_2=2"};
LP fwd_in[] = {
{ 2, 1},
{ 2,-1},
{-2, 1},
{-2,-1}
};
XY s_fwd_expect[] = {
{ 223368.11902663155, 111701.07212763709},
{ 223368.11902663155, -111701.07212763709},
{-223368.11902663155, 111701.07212763709},
{-223368.11902663155, -111701.07212763709},
};
XY inv_in[] = {
{ 200, 100},
{ 200,-100},
{-200, 100},
{-200,-100}
};
LP s_inv_expect[] = {
{ 0.0017904931100023887, 0.00089524655489191132},
{ 0.0017904931100023887, -0.00089524655489191132},
{-0.0017904931100023887, 0.00089524655489191132},
{-0.0017904931100023887, -0.00089524655489191132},
};
return pj_generic_selftest (0, s_args, tolerance_xy, tolerance_lp, 4, 4, fwd_in, 0, s_fwd_expect, inv_in, 0, s_inv_expect);
}
#endif
|
