Crs.IntersectCircles Method
Returns the points where two circles intersect.
IntersectCircles(Point center1, System.Double radius1, Point center2, System.Double radius2)
Returns the points where two circles intersect.Syntax
public PointCollection IntersectCircles (
Point center1,
System.Double radius1,
Point center2,
System.Double radius2
)Parameters
The center of the first circle, expressed in the Crs.
The radius of the first circle, in meters.
The center of the second circle, expressed in the Crs.
The radius of the second circle, in meters.
Return Value
A collection of the points where the two circles intersect.
Remarks
Two circles are specified by center (in the Crs) and radius (in meters). Although their centers are defined in the Crs, the circles are defined on the surface on the reference Ellipsoid. In other words, the distance from any point on a circle to its center is constant when computed as distance on the ellipsoid surface.
The returned collection will contain two points if the circles intersect each other, and no points otherwise.
Accuracy:
The method throws an exception if the Projection is a NonGeoreferencedProjection. Otherwise, the circle centers are first unprojected to LongLat, then the computation is done on the ellipsoid with submillimeter accuracy, then the results are projected. The errors caused by UnprojectToLongLat and ProjectFromLongLat may be larger.
Intersection angle and error propagation: The z value of each intersection point does not mean altitude: it is the angle of intersection in degrees, in the range 0° to 90°. A small intersection angle means that small errors in the radii or center coordinates can cause large errors in the intersection points. See IntersectLineSegments for details.
Platforms
Windows, Linux, Android