public static bool TryParse(string inputString, out Elevation elevation)
{
try
{
elevation = Parse(inputString);
return(true);
}
catch (Exception e)
{
elevation = null;
return(false);
}
}
//=======================================================================
#region -= static methods =-
/// <summary>
/// Must be in the format 2398,M
/// </summary>
/// <param name="inputString"></param>
/// <returns></returns>
public static Elevation Parse(string inputString)
{
//---- declare vars
Elevation elevation = new Elevation();
//---- split it in half
string[] halves = inputString.Trim().Split(',');
//----
if (halves.Length < 2)
{
throw new FormatException("Input string must be in the format 2398,M");
}
//---- parse the value
elevation.Value = decimal.Parse(halves[0]);
//---- parse the units (should always be meters)
elevation.UnitType = UnitTypeUtil.Parse(halves[1]);
//----
return(elevation);
}
//=======================================================================
#region -= static methods =-
//=======================================================================
public static GgaData Parse(string inputString)
{
if (string.IsNullOrEmpty(inputString) || inputString.IndexOf("*", StringComparison.Ordinal) < 0)
{
return(null);
}
//---- declare vars
GgaData data = new GgaData();
string dataString = inputString.Substring(0, inputString.IndexOf('*')); // strip off the checksum
string[] values = dataString.Split(',');
//---- if we don't have 15 (header + 14), it's no good
if (values.Length < 15)
{
throw new FormatException();
}
//---- if the time is six digits
if (values[1].Length == 9)
{
//---- make sure that they're actually numbers
//int temp;
//if (int.TryParse(values[1], out temp))
//{
//---- should add more validation here
int hour = int.Parse(values[1].Substring(0, 2));
int minute = int.Parse(values[1].Substring(2, 2));
int second = int.Parse(values[1].Substring(4, 2));
int millisecond = 0;
if (values[1].Length >= 9)
{
millisecond = Convert.ToInt32(double.Parse(values[1].Substring(6, 3)) * 1000);
}
data.UtcTime = new DateTime(DateTime.Now.Year, DateTime.Now.Month, DateTime.Now.Day, hour, minute, second, millisecond);
//}
//else { throw new FormatException("Date or time string is invalid"); }
}
//由于长春老网口版，上面会抛异常所以注销掉，20160323
//else { throw new FormatException("Date or time string is invalid"); }
//---- lat/long position
data.Position = Position.Parse(values[2] + "," + values[3] + ";" + values[4] + "," + values[5]);
//---- quality
data.Quality = (Quality)Enum.Parse(typeof(Quality), values[6]);
switch (int.Parse(values[6]))
{
case 0:
data.Quality = Quality.NoFix;
break;
case 1:
data.Quality = Quality.GpsFix;
break;
case 2:
//data.Quality = Quality.DifferentialGpsFix;
//todo:北斗星通，E,2时认为是高精度
data.Quality = Quality.FixedRealTimeKinematic;
break;
case 3:
data.Quality = Quality.PulsePerSecond;
break;
case 4:
data.Quality = Quality.FixedRealTimeKinematic;
break;
case 5:
data.Quality = Quality.FloatRealTimeKinematic;
break;
case 6:
data.Quality = Quality.Estimated;
break;
case 7:
data.Quality = Quality.ManualInput;
break;
case 8:
data.Quality = Quality.Simulated;
break;
default:
data.Quality = Quality.Unknown;
break;
}
//---- number of satellites
data.NumberOfSatelitesInUse = int.Parse(values[7]);
//---- HDOP
data.HorizontalDilutionOfPrecision = (string.IsNullOrEmpty(values[8]) ? 0 : decimal.Parse(values[8]));
//---- elevation
if (!string.IsNullOrEmpty(values[9]) && !string.IsNullOrEmpty(values[10]))
{
data.Elevation = Elevation.Parse(values[9] + "," + values[10]);
}
//---- geoidal separation
if (!string.IsNullOrEmpty(values[11]) && !string.IsNullOrEmpty(values[12]))
{
data.GeoidalSeparation = GeoidalSeparation.Parse(values[11] + "," + values[12]);
}
//---- age
data.DifferenceCorrection.Age = (string.IsNullOrEmpty(values[13]) ? 0M : decimal.Parse(values[13]));
//---- station ID
if (!string.IsNullOrEmpty(values[14]))
{
data.DifferenceCorrection.StationID = values[14];
}
//---- return
return(data);
//eg3. $GPGGA,hhmmss.ss,llll.ll,a,yyyyy.yy,a,x,xx,x.x,x.x,M,x.x,M,x.x,xxxx*hh
//1 = UTC of Position
//2 = Latitude
//3 = N or S
//4 = Longitude
//5 = E or W
//6 = GPS quality indicator (0=invalid; 1=GPS fix; 2=Diff. GPS fix)
//7 = Number of satellites in use [not those in view]
//8 = Horizontal dilution of position
//9 = Antenna altitude above/below mean sea level (geoid)
//10 = Meters (Antenna height unit)
//11 = Geoidal separation (Diff. between WGS-84 earth ellipsoid and
// mean sea level. -=geoid is below WGS-84 ellipsoid)
//12 = Meters (Units of geoidal separation)
//13 = Age in seconds since last update from diff. reference station
//14 = Diff. reference station ID#
//15 = Checksum
}
