/// <summary>
/// Decode a METAR/TAF message
/// </summary>
/// <param name="msg">The message</param>
/// <returns>A filled MTData object</returns>
public static MTData Decode(string msg)
{
var mdata = new MTData {
RAW = msg
}; // save reference
if (string.IsNullOrWhiteSpace(msg))
{
return(mdata);
}
string raw = msg.Replace("\n", "") + " "; // remove CRLF and we need a space at the end...
raw = M_MsgTypeDecoder.Decode(raw, mdata); // defaults to METAR if not tagged with a Msg Type
if (mdata.MsgType == MsgType.METAR)
{
DecodeMetar(raw, mdata);
}
else if (mdata.MsgType == MsgType.SPECI)
{
DecodeMetar(raw, mdata);
}
else if (mdata.MsgType == MsgType.TAF)
{
DecodeTaf(raw, mdata);
}
return(mdata);
}
/// <summary>
/// Decode a part into mData and return the rest
/// </summary>
/// <param name="raw">The raw METAR input string</param>
/// <param name="mData">The MData record to fill in</param>
/// <returns>The reminder of the input string, (raw minus the processed part)</returns>
public static string Decode(string raw, MTData mData)
{
try {
Match match = RE_metar.Match(raw);
if (match.Success)
{
mData.MsgType = MsgType.METAR;
if (match.Groups["opt"].Success && match.Groups["opt"].Value == "COR")
{
mData.MsgModifier = MsgModifier.COR;
}
return(match.Groups["rest"].Value.TrimStart( ));
}
match = RE_speci.Match(raw);
if (match.Success)
{
mData.MsgType = MsgType.SPECI;
if (match.Groups["opt"].Success && match.Groups["opt"].Value == "COR")
{
mData.MsgModifier = MsgModifier.COR;
}
return(match.Groups["rest"].Value.TrimStart( ));
}
match = RE_taf.Match(raw);
if (match.Success)
{
mData.MsgType = MsgType.TAF;
if (match.Groups["opt"].Success && match.Groups["opt"].Value == "AMD")
{
mData.MsgModifier = MsgModifier.AMD;
}
else if (match.Groups["opt"].Success && match.Groups["opt"].Value == "COR")
{
mData.MsgModifier = MsgModifier.COR;
}
else
{
mData.MsgModifier = MsgModifier.NONE;
}
return(match.Groups["rest"].Value.TrimStart( ));
}
}
catch {
; // DEBUG STOP
}
return(raw);
}
// Static Decoder
/// <summary>
/// Decode a METAR Message
/// </summary>
/// <param name="raw">The raw message starting with the StationID</param>
/// <param name="mdata">The MData record to fill</param>
private static void DecodeMetar(string raw, MTData mdata)
{
raw = M_StationDecoder.Decode(raw, mdata.Station);
if (!mdata.Station.Valid)
{
return; // ERROR must have
}
raw = M_ObsTimeDecoder.Decode(raw, mdata.ObsTime);
if (!mdata.ObsTime.Valid)
{
return; // ERROR must have
}
raw = M_ModifierDecoder.Decode(raw, mdata.Modifier);
if (mdata.Modifier.IsNil)
{
// cancelled - forget the rest and return
return;
}
raw = M_WindDecoder.Decode(raw, mdata.Wind);
raw = M_WindDecoder.Decode(raw, mdata.Wind); // optional variable part, will capture if there
raw = M_VisibilityDecoder.Decode(raw, mdata.Visibility);
while (M_RunwayVRDecoder.IsMatch(raw))// optional multiple
{
raw = M_RunwayVRDecoder.Decode(raw, mdata.RunwayVRs);
}
;
while (M_WeatherDecoder.IsMatch(raw))// optional multiple
{
raw = M_WeatherDecoder.Decode(raw, mdata.Weather);
}
while (M_SkyConditionDecoder.IsMatch(raw))// optional multiple
{
raw = M_SkyConditionDecoder.Decode(raw, mdata.SkyConditions);
}
;
raw = M_TempDecoder.Decode(raw, mdata.Temperature);
raw = M_PressureDecoder.Decode(raw, mdata.Altimeter);
// RMKs
// Eval Category
mdata.FlightCategory = M_CategoryDecoder.Decode(mdata);
}
/// <summary>
/// Decode a part into mData and return the rest
/// </summary>
/// <param name="raw">The raw METAR input string</param>
/// <param name="mData">The MData record to fill in</param>
/// <returns>The reminder of the input string, (raw minus the processed part)</returns>
public static string Decode(string raw, MTData mData)
{
try {
Match match = RE_regular.Match(raw);
if (match.Success)
{
mData.CancelFlag = (match.Groups["rest"].Value == "CNL");
return(match.Groups["rest"].Value.TrimStart( ));
}
}
catch {
; // DEBUG STOP
}
return(raw);
}
/// <summary>
/// Decode a TAF Message
/// </summary>
/// <param name="raw">The raw message starting with the StationID</param>
/// <param name="mdata">The MData record to fill</param>
private static void DecodeTaf(string raw, MTData mdata)
{
raw = M_StationDecoder.Decode(raw, mdata.Station);
if (!mdata.Station.Valid)
{
return; // ERROR must have
}
raw = M_ObsTimeDecoder.Decode(raw, mdata.ObsTime);
if (!mdata.ObsTime.Valid)
{
return; // ERROR must have
}
raw = T_PeriodDecoder.Decode(raw, mdata.TafPeriod);
if (!mdata.TafPeriod.Valid)
{
return; // ERROR must have
}
if (T_CancelDecoder.IsMatch(raw))
{
// cancelled - collect the flag, forget the rest and return
raw = T_CancelDecoder.Decode(raw, mdata);
return;
}
// add the basic FC record here as we go and process further parts
mdata.Forecasts.Add(new T_Forecast( )
{
Valid = true, From = mdata.TafPeriod.From, To = mdata.TafPeriod.To, IsTimeSpan = true
});
raw = M_WindDecoder.Decode(raw, mdata.Forecasts.First( ).Wind);
raw = M_WindDecoder.Decode(raw, mdata.Forecasts.First( ).Wind); // optional variable part, will capture if there
raw = M_VisibilityDecoder.Decode(raw, mdata.Forecasts.First( ).Visibility);
while (M_WeatherDecoder.IsMatch(raw))// optional multiple
{
raw = M_WeatherDecoder.Decode(raw, mdata.Forecasts.First( ).Weather);
}
while (M_SkyConditionDecoder.IsMatch(raw))// optional multiple
{
raw = M_SkyConditionDecoder.Decode(raw, mdata.Forecasts.First( ).SkyConditions);
}
;
while (T_TempMinMaxDecoder.IsMatch(raw))// optional multiple
{
raw = T_TempMinMaxDecoder.Decode(raw, mdata.Forecasts.First( ).TempMinMax);
}
;
// Eval Category
mdata.Forecasts.First( ).FlightCategory = M_CategoryDecoder.Decode(mdata.Forecasts.First( ));
// We should get into the additional forecast records now..
while (T_ForecastDecoder.IsMatch(raw))
{
raw = T_ForecastDecoder.Decode(raw, mdata.Forecasts);
// collect the allowed forecast records
raw = M_WindDecoder.Decode(raw, mdata.Forecasts.Last( ).Wind);
raw = M_WindDecoder.Decode(raw, mdata.Forecasts.Last( ).Wind); // optional variable part, will capture if there
raw = M_VisibilityDecoder.Decode(raw, mdata.Forecasts.Last( ).Visibility);
while (M_WeatherDecoder.IsMatch(raw))// optional multiple
{
raw = M_WeatherDecoder.Decode(raw, mdata.Forecasts.Last( ).Weather);
}
while (M_SkyConditionDecoder.IsMatch(raw))// optional multiple
{
raw = M_SkyConditionDecoder.Decode(raw, mdata.Forecasts.Last( ).SkyConditions);
}
;
// Eval Category
mdata.Forecasts.Last( ).FlightCategory = M_CategoryDecoder.Decode(mdata.Forecasts.Last( ));
}
}
/// <summary>
/// Evaluate the FlightCategory
/// </summary>
/// <param name="mdata">An MData record</param>
/// <returns>A FlightCategory record</returns>
public static M_Category Decode(MTData mdata)
{
var ret = new M_Category();
// OFF_LIMIT Ceilings are less than 200 feet above ground level and/or visibility is less than 0.5 mile.
bool trigger = false;
trigger |= mdata.Visibility.Valid && mdata.Visibility.Distance_SM < 0.5;
trigger |= mdata.SkyConditions.Count > 0 && mdata.SkyConditions[0].Height_ft < 200;
if (trigger)
{
ret.FlightCategory = FLCat.LIFR;
ret.Valid = true;
return(ret);
}
// LIFR Ceilings are less than 500 feet above ground level and/or visibility is less than 1 mile.
trigger = false;
trigger |= mdata.Visibility.Valid && mdata.Visibility.Distance_SM < 1.0;
trigger |= mdata.SkyConditions.Count > 0 && mdata.SkyConditions[0].Height_ft < 500;
if (trigger)
{
ret.FlightCategory = FLCat.LIFR;
ret.Valid = true;
return(ret);
}
// IFR Ceilings 500 to less than 1,000 feet and/or visibility 1 to less than 3 miles.
trigger = false;
trigger |= mdata.Visibility.Valid && mdata.Visibility.Distance_SM >= 1.0 && mdata.Visibility.Distance_SM < 3.0;
trigger |= mdata.SkyConditions.Count > 0 && mdata.SkyConditions[0].Height_ft >= 500 && mdata.SkyConditions[0].Height_ft < 1000;
if (trigger)
{
ret.FlightCategory = FLCat.IFR;
ret.Valid = true;
return(ret);
}
// MVFR Ceilings 1,000 to 3,000 feet and/or visibility is 3-5 miles inclusive.
trigger = false;
trigger |= mdata.Visibility.Valid && mdata.Visibility.Distance_SM >= 3.0 && mdata.Visibility.Distance_SM <= 5.0;
trigger |= mdata.SkyConditions.Count > 0 && mdata.SkyConditions[0].Height_ft >= 1000 && mdata.SkyConditions[0].Height_ft <= 3000;
if (trigger)
{
ret.FlightCategory = FLCat.MVFR;
ret.Valid = true;
return(ret);
}
// VFR Ceiling greater than 3000 feet and visibility greater than 5 miles (includes sky clear).
trigger = true;
trigger &= mdata.Visibility.Valid && mdata.Visibility.Distance_SM > 5.0;
trigger &= mdata.SkyConditions.Count > 0 && mdata.SkyConditions[0].Height_ft > 3000;
trigger |= mdata.Visibility.CAVOK; // overrides
if (trigger)
{
ret.FlightCategory = FLCat.VFR;
ret.Valid = true;
return(ret);
}
// missing data
ret.FlightCategory = FLCat.UNKOWN;
ret.Valid = true;
return(ret);
}
