LineOfVisibility.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.
+
+# LineOfVisibility
+
+**Extends** : [CZMLPrimaryObjects](CZMLPrimaryObjects)
+
+**Example** : 
+```json
+{
+    "id":"Toulouse Frame/Keplerian parameters: {a: 6928000.0; e: 0.0; i: 60.00000000000001; pa: 0.0; raan: 90.0; v: 90.0;}",
+    "name":"Line between Toulouse Frame and Keplerian parameters: {a: 6928000.0; e: 0.0; i: 60.00000000000001; pa: 0.0; raan: 90.0; v: 90.0;}",
+    "availability":"0001-01-01T00:00:00Z/2022-01-17T13:00:00Z",
+    "polyline":{
+      "width":1,
+      "material":{
+        "solidColor":{
+          "color":{
+            "rgba":[
+              0,255,255,255
+            ]
+          }
+        }
+      },
+      "arcType":"NONE",
+      "positions":{
+        "references":[
+          "VIS/Toulouse Frame/Keplerian parameters: {a: 6928000.0; e: 0.0; i: 60.00000000000001; pa: 0.0; raan: 90.0; v: 90.0;}#position",
+          "Keplerian parameters: {a: 6928000.0; e: 0.0; i: 60.00000000000001; pa: 0.0; raan: 90.0; v: 90.0;}#position"
+        ]
+      },
+      "show":[
+        {
+          "interval":"0001-01-01T00:00:00Z/2022-01-17T13:00:00Z",
+          "boolean":false
+        }
+      ]
+    }
+  },
+```
+
+# Properties
+
+**id** - String : Identification of the line of visibility, *default* : " [Name of the ground station]/[Id of the satellite]".
+
+**name** String : Name of the CZML ground station, *default* : "Line between [Name of the ground station] and [Name of the satellite].
+
+**polyline** - [Polyline](Polyline) : A polyline object that represents the line that will be displayed to follow the satellite
+
+## Intrinsic arguments
+
+**TopocentricFrame** - [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html) : The Orekit Topocentric Frame
+
+**angleOfAperture** - Double : The angle of aperture for the visiblity, *default* : 80.0°.
+
+# Build
+
+These arguments can be used to build a line of visibility object :
+
+* A [Visibility Cone](VisibilityCone) :
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(visibilityCone);
+```
+
+* A [Visibility Cone](VisibilityCone), an angle of aperture :
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(visibilityCone, angleOfAperture);
+```
+
+* A [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html), a [Satellite](Satellite), a [Header](Header) :
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(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
+LineOfVisibility lineOfVisibility = new LineOfVisibility(topocentricFrame, satellite, header, angleOfAperture);
+```
+
+* A [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html), a [Constellation](Constellation), a [Header](Header) : (**This builder will create all lines of visibility for all satellites of a constellation for a given ground station**)
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(topocentricFrame, constellation, header);
+```
+
+* A [TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html), a [Constellation](Constellation), a [Header](Header), an angle of aperture : (**This builder will create all lines of visibility for all satellites of a constellation for a given ground station**)
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(topocentricFrame, constellation, header, angleOfAperture);
+```
+
+* A List<[TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html)>, a [Constellation](Constellation), a [Header](Header) : (**This builder will create all lines of visibility for all satellites of a constellation for all the stations for each topocentricFrame**).
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(topocentricFrameList, constellation, header);
+```
+
+* A List<[TopocentricFrame](https://www.orekit.org/site-orekit-development/apidocs/org/orekit/frames/TopocentricFrame.html)>, a [Constellation](Constellation), a [Header](Header), an angle of aperture : (**This builder will create all lines of visibility for all satellites of a constellation for all the stations for each topocentricFrame**).
+```Java
+LineOfVisibility lineOfVisibility = new LineOfVisibility(topocentricFrameList, constellation, header, angleOfAperture);
+```
+