PostGIS  2.3.7dev-r@@SVN_REVISION@@
static void test_sphere_project ( void  )
static

Definition at line 92 of file cu_geodetic.c.

References geographic_point_init(), GEOGRAPHIC_POINT::lat, GEOGRAPHIC_POINT::lon, s, sphere_direction(), sphere_distance(), and sphere_project().

Referenced by geodetic_suite_setup().

93 {
95  double dir1, dist1, dir2, dist2;
96 
97  dir1 = M_PI_2;
98  dist1 = 0.1;
99 
100  geographic_point_init(0, 0, &s);
101  sphere_project(&s, dist1, dir1, &e);
102 
103  CU_ASSERT_DOUBLE_EQUAL(e.lon, 0.1, 1e-14);
104  CU_ASSERT_DOUBLE_EQUAL(e.lat, 0.0, 1e-14);
105 
106  /* Direct and inverse solutions agree */
107  dist2 = sphere_distance(&s, &e);
108  dir2 = sphere_direction(&s, &e, dist1);
109 
110  CU_ASSERT_DOUBLE_EQUAL(dist1, dist2, 1e-14);
111  CU_ASSERT_DOUBLE_EQUAL(dir1, dir2, 1e-14);
112 
113  dist1 = sphere_distance(&e, &s);
114  dir1 = sphere_direction(&e, &s, dist1);
115  sphere_project(&e, dist1, dir1, &s);
116 
117  CU_ASSERT_DOUBLE_EQUAL(s.lon, 0.0, 1e-14);
118  CU_ASSERT_DOUBLE_EQUAL(s.lat, 0.0, 1e-14);
119 
120  geographic_point_init(0, 0.2, &e);
121  geographic_point_init(0, 0.4, &s);
122  dist1 = sphere_distance(&s, &e);
123  dir1 = sphere_direction(&e, &s, dist1);
124  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "0.2 0 0.4 0" */
125  CU_ASSERT_DOUBLE_EQUAL(dir1, 0.0, 1e-14);
126  CU_ASSERT_DOUBLE_EQUAL(dist1, 0.0034906585039887, 1e-14);
127 
128  geographic_point_init(0, 1, &s); /* same start point for remainder of tests */
129  geographic_point_init(0, 2, &e);
130  dist2 = sphere_distance(&s, &e);
131  dir2 = sphere_direction(&s, &e, dist2);
132  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "1 0 2 0" */
133  CU_ASSERT_DOUBLE_EQUAL(dir2, 0.0, 1e-14);
134  CU_ASSERT_DOUBLE_EQUAL(dist2, 0.0174532925199433, 1e-14);
135 
136  geographic_point_init(1, 1, &e);
137  dist2 = sphere_distance(&s, &e);
138  dir2 = sphere_direction(&s, &e, dist2);
139  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "1 0 1 1" */
140  CU_ASSERT_DOUBLE_EQUAL(dir2, 89.991273575329292895136 * M_PI / 180.0, 1e-14);
141  CU_ASSERT_DOUBLE_EQUAL(dist2, 0.0174506342314906, 1e-14);
142 
143  geographic_point_init(0, 0, &e);
144  dist2 = sphere_distance(&s, &e);
145  dir2 = sphere_direction(&s, &e, dist2);
146  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "1 0 0 0" */
147  CU_ASSERT_DOUBLE_EQUAL(dir2, M_PI, 1e-14);
148  CU_ASSERT_DOUBLE_EQUAL(dist2, 0.0174532925199433, 1e-14);
149 
150  geographic_point_init(-1, 1, &e);
151  dist2 = sphere_distance(&s, &e);
152  dir2 = sphere_direction(&s, &e, dist2);
153  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "1 0 1 -1" */
154  CU_ASSERT_DOUBLE_EQUAL(dir2, -89.991273575329292895136 * M_PI / 180.0, 1e-14);
155  CU_ASSERT_DOUBLE_EQUAL(dist2, 0.0174506342314906, 1e-14);
156 
157  geographic_point_init(1, 2, &e);
158  dist2 = sphere_distance(&s, &e);
159  dir2 = sphere_direction(&s, &e, dist2);
160  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "1 0 2 1" */
161  CU_ASSERT_DOUBLE_EQUAL(dir2, 44.978182941465044354783 * M_PI / 180.0, 1e-14);
162  CU_ASSERT_DOUBLE_EQUAL(dist2, 0.0246782972905467, 1e-14);
163 
164  geographic_point_init(-1, 0, &e);
165  dist2 = sphere_distance(&s, &e);
166  dir2 = sphere_direction(&s, &e, dist2);
167  /* GeodSolve -i -E -p 16 -e 1 0 --input-string "1 0 0 -1" */
168  CU_ASSERT_DOUBLE_EQUAL(dir2, -134.995636455344851488216 * M_PI / 180.0, 1e-14);
169  CU_ASSERT_DOUBLE_EQUAL(dist2, 0.0246820563917664, 1e-14);
170 }
double sphere_distance(const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e)
Given two points on a unit sphere, calculate their distance apart in radians.
Definition: lwgeodetic.c:913
int sphere_project(const GEOGRAPHIC_POINT *r, double distance, double azimuth, GEOGRAPHIC_POINT *n)
Given a starting location r, a distance and an azimuth to the new point, compute the location of the ...
Definition: lwgeodetic.c:1279
Point in spherical coordinates on the world.
Definition: lwgeodetic.h:47
char * s
Definition: cu_in_wkt.c:23
void geographic_point_init(double lon, double lat, GEOGRAPHIC_POINT *g)
Initialize a geographic point.
Definition: lwgeodetic.c:171
double sphere_direction(const GEOGRAPHIC_POINT *s, const GEOGRAPHIC_POINT *e, double d)
Given two points on a unit sphere, calculate the direction from s to e.
Definition: lwgeodetic.c:940

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