/// <summary>
/// Get the GPS data from the ensemble using the database reader.
/// </summary>
/// <param name="reader">Database reader.</param>
/// <returns>If NMEA data exist, pass the data, or return NULL.</returns>
public static GpsData GetGpsData(DbDataReader reader)
{
// Get the NMEA data
string jsonNmea = reader["NmeaDS"].ToString();
DbDataHelper.GpsData gpsData = null;
if (!string.IsNullOrEmpty(jsonNmea))
{
// Convert to a JSON object
JObject ensNmea = JObject.Parse(jsonNmea);
string[] nmeaStrings = ensNmea["NmeaStrings"].ToObject <string[]>();
if (nmeaStrings != null && nmeaStrings.Length > 0)
{
gpsData = DbDataHelper.DecodeNmea(nmeaStrings);
}
}
// Check if we have a valid GPS speed
if (gpsData != null && gpsData.GPVTG != null && gpsData.GPHDT != null && gpsData.GPVTG.IsValid && gpsData.GPHDT.IsValid)
{
// Convert the speed and east and north component
// Speed from the GPS
double speed = gpsData.GPVTG.Speed.ToMetersPerSecond().Value;
// Calculate the East and North component of the GPS speed
gpsData.BackupShipEast = Convert.ToSingle(speed * Math.Sin(gpsData.GPHDT.Heading.ToRadians().Value));
gpsData.BackupShipNorth = Convert.ToSingle(speed * Math.Cos(gpsData.GPHDT.Heading.ToRadians().Value));
gpsData.IsBackShipSpeedGood = true;
}
else if (gpsData != null && gpsData.GPHDT != null && gpsData.GPRMC != null && gpsData.GPRMC.IsValid && gpsData.GPHDT.IsValid)
{
// Convert the speed and east and north component
// Speed from the GPS
double speed = gpsData.GPRMC.Speed.ToMetersPerSecond().Value;
// Calculate the East and North component of the GPS speed
gpsData.BackupShipEast = Convert.ToSingle(speed * Math.Sin(gpsData.GPHDT.Heading.ToRadians().Value));
gpsData.BackupShipNorth = Convert.ToSingle(speed * Math.Cos(gpsData.GPHDT.Heading.ToRadians().Value));
gpsData.IsBackShipSpeedGood = true;
}
return(gpsData);
}
/// <summary>
/// Query the data from the database.
/// </summary>
/// <param name="cnn">SQLite connection.</param>
/// <param name="query">Query for the data.</param>
/// <param name="magScale">Magnitude scale.</param>
/// <param name="minIndex">Minimum index.</param>
/// <param name="maxIndex">Maximum index.</param>
/// <returns></returns>
private List <ShipTrackData> QueryDataFromDb(SQLiteConnection cnn, string query, double magScale, int minIndex = 0, int maxIndex = 0)
{
// Init list
double prevBtEast = DbDataHelper.BAD_VELOCITY;
double prevBtNorth = DbDataHelper.BAD_VELOCITY;
double prevBtTime = 0.0;
// Init the new series data
List <ShipTrackData> stDataList = new List <ShipTrackData>();
//stData.MagScale = magScale;
// Ensure a connection was made
if (cnn == null)
{
return(null);
}
using (DbCommand cmd = cnn.CreateCommand())
{
cmd.CommandText = query;
// Get Result
DbDataReader reader = cmd.ExecuteReader();
while (reader.Read())
{
ShipTrackData stData = new ShipTrackData();
// Update the status
StatusProgress++;
StatusMsg = reader["EnsembleNum"].ToString();
// Get the Ensemble number and Date and time
stData.DateTime = reader["DateTime"].ToString();
stData.EnsNum = reader["EnsembleNum"].ToString();
// Plot the lat/lon
//stData.LatLon = reader["Position"].ToString();
// Heading
//DbDataHelper.HPR hpr = DbDataHelper.GetHPR(reader);
//stData.Heading = hpr.Heading;
//// Get the range bin
//int rangeBin = DbDataHelper.GetRangeBin(reader);
//// Get the magnitude data
//string jsonEarth = reader["EarthVelocityDS"].ToString();
//if (!string.IsNullOrEmpty(jsonEarth))
//{
// // Convert to a JSON object
// JObject ensEarth = JObject.Parse(jsonEarth);
// // Average the data
// avgMag = DbDataHelper.GetAvgMag(ensEarth, IsMarkBadBelowBottom, rangeBin, DbDataHelper.BAD_VELOCITY);
// avgDir = DbDataHelper.GetAvgDir(ensEarth, IsMarkBadBelowBottom, rangeBin, DbDataHelper.BAD_VELOCITY);
// //Debug.WriteLine(string.Format("Avg Dir: {0} Avg Mag: {1}", avgDir, avgMag));
//}
if (IsUseGpsSpeedBackup)
{
// Get the GPS data from the database
DbDataHelper.GpsData gpsData = DbDataHelper.GetGpsData(reader);
// Check for a backup value for BT East and North speed from the GPS if a Bottom Track value is never found
if (Math.Round(prevBtEast, 4) == BAD_VELOCITY && gpsData != null && gpsData.IsBackShipSpeedGood)
{
prevBtEast = gpsData.BackupShipEast;
prevBtNorth = gpsData.BackupShipNorth;
}
}
// Get the velocity
DbDataHelper.VelocityMagDir velMagDir = DbDataHelper.CreateVelocityVectors(reader, prevBtEast, prevBtNorth, true, true);
if (velMagDir.IsBtVelGood)
{
// Get the average range
//stData.AvgRange = DbDataHelper.GetAverageRange(reader);
DataPoint pt = CalculateDistanceTraveledPoint(velMagDir, prevBtTime, prevBtEast, prevBtNorth);
stData.ShipData.Add(pt);
// Store the backup value
prevBtEast = velMagDir.BtEastVel;
prevBtNorth = velMagDir.BtNorthVel;
prevBtTime = velMagDir.BtFirstPingTime;
}
// Add the data to the list
stDataList.Add(stData);
}
}
return(stDataList);
}
