public static GpsFile Read(string fileName)
{
GpsFile gpsFile = new GpsFile();
gpsFile.Tracks.Add(new GpsTrack());
gpsFile.Tracks.First().Segments.Add(new GpsTrackSegment());
List <List <string> > nmeaFile = NmeaFileManager.ReadFile(fileName);
// Save the current date
DateTime currentDate;
// Look for first GPGGA record, which contains the current date
List <string> gprmcRecord = nmeaFile.Where(x => x[0].StartsWith("$GPRMC")).FirstOrDefault();
if (gprmcRecord == null)
{
throw new Exception("Unable to find a valid GPRMC in the Nmea file");
}
else
{
currentDate = NmeaFileManager.ParseGPRMC(gprmcRecord);
}
foreach (List <string> nmeaLine in nmeaFile)
{
// See what type of data it is
switch (nmeaLine[0])
{
case "$GPRMC":
// Date
currentDate = NmeaFileManager.ParseGPRMC(nmeaLine);
break;
case "$GPGGA":
// Gps Coordinate
GpsTrackPoint trackPoint = NmeaFileManager.ParseGPGGA(nmeaLine, currentDate);
if (trackPoint.IsValidCoordinate)
{
gpsFile.Tracks.Last().Segments.Last().Points.Add(trackPoint);
}
break;
default:
break;
}
}
return(gpsFile);
}
public static GpsTrackPoint ParseGPGGA(List <string> sentence, DateTime currentDate)
{
// Spec from http://aprs.gids.nl/nmea/
// Example $GPGGA,150353.1,4739.466643,N,12207.287734,W,1,09,1.1,9.4,M,-16.0,M,,*67
GpsTrackPoint gpsTrackPoint = new GpsTrackPoint();
gpsTrackPoint.Source = "Nmea File";
// Get the Date and Time
if (sentence[1] != "")
{
// && sentence[9] != "")
// Get hours, minutes, seconds and milliseconds
int utcHours = Convert.ToInt32(sentence[1].Substring(0, 2));
int utcMinutes = Convert.ToInt32(sentence[1].Substring(2, 2));
int utcSeconds = Convert.ToInt32(sentence[1].Substring(4, 2));
int utcMilliseconds = 0;
// Get milliseconds if it is available
if (sentence[1].Length > 7)
{
utcMilliseconds = Convert.ToInt32(float.Parse(sentence[1].Substring(6), new CultureInfo("en-US")) * 1000);
}
// Save the time
gpsTrackPoint.Time = new DateTime(currentDate.Year, currentDate.Month, currentDate.Day, utcHours, utcMinutes, utcSeconds, utcMilliseconds);
}
// Get Latitude and Longitude
if (sentence[2] != "" && sentence[3] != "" && sentence[4] != "" && sentence[5] != "")
{
// Get Latitude
double latHours = Math.Floor(Convert.ToDouble(sentence[2], NumberFormatInfo.InvariantInfo) / 100);
double latMinutes = Convert.ToDouble(sentence[2], NumberFormatInfo.InvariantInfo) - (latHours * 100);
if (sentence[3] == "N")
{
gpsTrackPoint.Latitude = new GpsCoordinate(GpsCoordinate.LatitudeRef.North, latHours, latMinutes);
}
else if (sentence[3] == "S")
{
gpsTrackPoint.Latitude = new GpsCoordinate(GpsCoordinate.LatitudeRef.South, latHours, latMinutes);
}
// Get Longitude
double lonHours = Math.Floor(Convert.ToDouble(sentence[4], NumberFormatInfo.InvariantInfo) / 100);
double lonMinutes = Convert.ToDouble(sentence[4], NumberFormatInfo.InvariantInfo) - (lonHours * 100);
if (sentence[5] == "E")
{
gpsTrackPoint.Longitude = new GpsCoordinate(GpsCoordinate.LongitudeRef.East, lonHours, lonMinutes);
}
else if (sentence[5] == "W")
{
gpsTrackPoint.Longitude = new GpsCoordinate(GpsCoordinate.LongitudeRef.West, lonHours, lonMinutes);
}
}
// Get Latitude and Longitude
if (sentence[9] != "" && sentence[10] != "")
{
// Get Altitude
double altitude = Convert.ToDouble(sentence[9], NumberFormatInfo.InvariantInfo);
gpsTrackPoint.Altitude = altitude;
}
if (gpsTrackPoint.IsValidCoordinate)
{
return(gpsTrackPoint);
}
else
{
return(new GpsTrackPoint());
}
}
