/// <summary>
/// Tries to download from AGI's server a list of TLEs describing the satellite which has the given string
/// NORAD identifier for the 24 hour period following the given date. If AGI's server is unavailable
/// (i.e. if the machine on which the demo is running is not connected to the internet),
/// pulls the list of TLEs from the local Data directory.
/// </summary>
public static List <TwoLineElementSet> GetTles(string satelliteIdentifier, JulianDate date)
{
try
{
return(TwoLineElementSet.DownloadTles(satelliteIdentifier, date, date.AddDays(1.0)));
}
catch (DataUnavailableException)
{
// Read from local data if the machine does not have access to the internet.
string dataPath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, AppDomain.CurrentDomain.RelativeSearchPath ?? "", "Data");
var satelliteDatabase = new StkSatelliteDatabase(Path.Combine(dataPath, "SatelliteDatabase"), "stkSatDb");
var query = new StkSatelliteDatabaseQuery
{
SatelliteNumber = new Regex(satelliteIdentifier)
};
foreach (var entry in satelliteDatabase.GetEntries(query))
{
return(new List <TwoLineElementSet> {
entry.TwoLineElementSet
});
}
throw new DataUnavailableException("TLE data for " + satelliteIdentifier + " could not be found in local SatelliteDatabase");
}
}
/// <summary>
/// Load TLEs from a satellite database and create marker primitives for each satellite
/// </summary>
private void CreateSatellites(string fileName)
{
m_satellites.Clear();
JulianDate?epoch = null;
StkSatelliteDatabase db = new StkSatelliteDatabase(GetDataFilePath("SatelliteDatabase"), fileName);
foreach (StkSatelliteDatabaseEntry entry in db.GetEntries())
{
if (entry.TwoLineElementSet != null)
{
Sgp4Propagator propagator = new Sgp4Propagator(entry.TwoLineElementSet);
if (epoch == null)
{
epoch = propagator.InitialConditions.Epoch;
}
Duration epochDifference = epoch.Value - propagator.InitialConditions.Epoch;
if (epochDifference < Duration.FromDays(1))
{
m_satellites.Add(propagator.GetEvaluator(), entry.TwoLineElementSet.Epoch);
}
}
}
SetText(m_satellites.Count);
JulianDate time = epoch.Value.ToTimeStandard(TimeStandard.InternationalAtomicTime);
// Set epoch time
m_animation.Pause();
m_animation.StartTime = time;
m_animation.EndTime = time.AddDays(1.0);
m_animation.Time = time;
m_animation.PlayForward();
}
