Calculates an elevation circle on an ellipsoid model.

Namespace: Zeptomoby.OrbitTools.Track
Assembly: Zeptomoby.OrbitTools.Track (in Zeptomoby.OrbitTools.Track.dll) Version: (


public static List<Geo> IsoElevationCircle(
	this WgsModel ellipsoid,
	EciTime subpoint,
	Eci target,
	double degAngle,
	double kmSpacing,
	double kmLoft
Visual Basic
<ExtensionAttribute> _
Public Shared Function IsoElevationCircle ( _
	ellipsoid As WgsModel, _
	subpoint As EciTime, _
	target As Eci, _
	degAngle As Double, _
	kmSpacing As Double, _
	kmLoft As Double _
) As List(Of Geo)
Visual C++
static List<Geo^>^ IsoElevationCircle(
	WgsModel^ ellipsoid, 
	EciTime^ subpoint, 
	Eci^ target, 
	double degAngle, 
	double kmSpacing, 
	double kmLoft


Type: WgsModel
The ellipsoid model.
Type: EciTime
The center location of elevation circle.
Type: Eci
The target location.
Type: System..::..Double
The viewing angle, from the circle perimeter to the target location, [0..90] degrees.
Type: System..::..Double
The distance between each point in the circle, in kilometers.
Type: System..::..Double
The height of the circle above the earth ellipsoid model, in kilometers.

Return Value

A list of Geodetic coordinate points that form a circle on the ellipsoid, centered around a given subpoint location. The points all have the same viewing angle of elevation to the given target location.

Usage Note

In Visual Basic and C#, you can call this method as an instance method on any object of type WgsModel. When you use instance method syntax to call this method, omit the first parameter. For more information, see or .


The returned points do not always form a perfect circle due to the Earth's equatorial bulge.

See Also