enclosure_cnvx.F90 File Reference

Test whether a point is inside a spherical convex polygon. More...

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Functions/Subroutines
LOGICAL function	enclosure_cnvx (v, n, p, co_gc)
	Test whether a given point 'p' is inside a convex spherical polygon defined with a series of 'n' vertices. More...

Detailed Description

Test whether a point is inside a spherical convex polygon.

Author

N Wang

Definition in file enclosure_cnvx.F90.

Function/Subroutine Documentation

LOGICAL function enclosure_cnvx	(	real*8, dimension(2,n), intent(in)	v,
		integer, intent(in)	n,
		real*8, dimension(2), intent(in)	p,
		integer, intent(out)	co_gc
	)

Test whether a given point 'p' is inside a convex spherical polygon defined with a series of 'n' vertices.

Both the test point and the polygon are specified in latitude and longitude radians. It is assumed that a side of a spherical polygon is a great-circle arc that connects 2 adjacent vertices of the polygon.

Parameters

[in]	v	set of vertices
[in]	n	number of vertices in v
[in]	p	point to test
[out]	co_gc	'i' if p is on or within epsilon to side 'i' of the given spherical polygon, or 0 if point is not on any side of the given polygon.

Returns

enclosure_cnvx whether the point is inside the polygon

Author

N Wang

Definition at line 49 of file enclosure_cnvx.F90.

Referenced by cal_lake_frac_depth().