VisibilityCone.md

+This page describes the content of a CZML document. Please read [How to get started]() for an explanation of how a CZML document is put together.
+
+**Extends** : [CZMLPrimaryObject](CZMLPrimaryObject)
+
+**Example** : 
+```json
+{
+    "id":"VIS/Toulouse Frame/Keplerian parameters: {a: 6928000.0; e: 0.0; i: 60.00000000000001; pa: 0.0; raan: 90.0; v: 90.0;}",
+    "name":"Visibility of Toulouse Frame looking at Keplerian parameters: {a: 6928000.0; e: 0.0; i: 60.00000000000001; pa: 0.0; raan: 90.0; v: 90.0;}",
+    "availability":"2022-01-17T12:00:00Z/2022-01-17T13:00:00Z",
+    "cylinder":{
+      "bottomRadius":10,
+      "topRadius":31188660.731582925,
+      "length":3464000,
+      "material":{
+        "solidColor":{
+          "color":{
+            "rgba":[
+              0,0,0,0
+            ]
+          }
+        }
+      },
+      "heightReference":"CLAMP_TO_GROUND"
+    },
+    "position":{
+      "interval":"2022-01-17T12:00:00Z/2022-01-17T13:00:00Z",
+      "cartesian":[
+        4624415.12018318,116587.90809901741,4376399.285187051
+      ]
+    }
+  },
+```
+
+# Parameters
+
+**id** - String : Identification of the visibility cone, *default* : "VIS/[Name of the station]/[Name of the satellite].
+
+**name** - String : Name of the visibility cone, *default* : "Frame of the station [name of the station] looking at [name of the satellite].
+
+**Cylinder** - [Cylinder](Cylinder) : The cylinder object, that describes the geometric objects representing the visibility.
+
+**availability** - [TimeInterval](https://cesium.com/learn/cesiumjs/ref-doc/TimeInterval.html) : Time interval where the visibility cone is displayed.
+
+**position** - [Position](Position) : The position in a given frame of the visibility cone (usually on the ground station)
+
+**angle of aperture** - Double : The angle of aperture of the station, *default* : 80.0°
+
+##Intrinsic arguments
+
+**TopocentricFrame** - [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html) : The Orekit TopocentricFrame Object
+
+# Build
+
+These arguments can be used to build a visibility cone object :
+
+* An id, a name, a cylinder, an availability : (**this visibility cone will have a fix height of a terrestrial radius**)
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(id, name, cylinder, avalability);
+```
+
+* An id, a name, a cylinder, an availability, a [Satellite](Satellite) : (**This constructor allows the visibility cone to reach only the given satellite, so the height is fixed to the altitude of the satellite**)
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(id, name, cylinder, avalabilityn satellite);
+```
+
+* A [CZMLGroundStation](CZMLGroundStation), a [Header](Header) : 
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(groundStation, header);
+```
+
+* A [CZMLGroundStation](CZMLGroundStation), a [Header](Header), a [Satellite](Satellite) : 
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(groundStation, satellite, header);
+```
+
+* A [CZMLGroundStation](CZMLGroundStation), a [Header](Header) , an angle of aperture : 
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(groundStation, header, angleOfAperture);
+```
+
+* A [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html), a [Satellite](Satellite), a [Header](Header) :
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(topocentricFrame, satellite, header);
+```
+
+* A [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html), a [Satellite](Satellite), a [Header](Header), an angle of aperture :
+```Java
+new VisibilityCone visibilityCone = new VisibilityCone(topocentricFrame, satellite, header, angleOfAperture);
+```
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