PostGIS  2.2.8dev-r@@SVN_REVISION@@

◆ circ_node_min_distance()

static double circ_node_min_distance ( const CIRC_NODE n1,
const CIRC_NODE n2 
)
static

Definition at line 535 of file lwgeodetic_tree.c.

References circ_node::center, circ_node::radius, and sphere_distance().

Referenced by circ_tree_distance_tree_internal().

536 {
537  double d = sphere_distance(&(n1->center), &(n2->center));
538  double r1 = n1->radius;
539  double r2 = n2->radius;
540 
541  if ( d < r1 + r2 )
542  return 0.0;
543 
544  return d - r1 - r2;
545 }
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:898
GEOGRAPHIC_POINT center
double radius
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