ll2cart()

void ll2cart	(	const POINT2D *	g,
		POINT3D *	p
	)

Convert lon/lat coordinates to cartesion coordinates on unit sphere.

Definition at line 419 of file lwgeodetic.c.

References POINT2D::x, POINT3D::x, POINT2D::y, POINT3D::y, and POINT3D::z.

Referenced by lwpoly_intersects_line(), ptarray_calculate_gbox_geodetic(), ptarray_contains_point_sphere(), and test_sphere_project().

{
        double x_rad = M_PI * g->x / 180.0;
        double y_rad = M_PI * g->y / 180.0;
        double cos_y_rad = cos(y_rad);
        p->x = cos_y_rad * cos(x_rad);
        p->y = cos_y_rad * sin(x_rad);
        p->z = sin(y_rad);
}

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