/// <summary>
/// 获取上一个GPS节点
/// </summary>
/// <param name="obj"></param>
/// <param name="StrCodePrefix"></param>
/// <returns></returns>
public GPSDataEntity GetLastGPSData(YW3000Data data)
{
return CacheUtility.GetCurrentInfoFromHT(data.FullGpsCode);
}
public YW3000Data NewYW3000Data(ref string[] headers, ref string[] options)
{
try
{
double pvalue = 0;
YW3000Data data = new YW3000Data();
data.BaseData.IsLocatedData = true;
data.BaseData.GPSCode = headers[1];
data.FullGpsCode = mStrCodePrefix + data.BaseData.GPSCode;
DateTime time = DateTime.MinValue;
if (!CommandHelper.ParseGpsTime(options[1], out time))
data.BaseData.IsLocatedData = false;
else
time = time.AddHours(8);
data.BaseData.ReportTime = time;
data.BaseData.ReceiveTime = DateTime.Now;
data.BaseData.Longitude = (decimal)CommandHelper.ParseLongitude(options[2]);
data.BaseData.Latitude = (decimal)CommandHelper.ParseLatitude(options[3]);
data.BaseData.Speed = (decimal)(double.TryParse(options[5], out pvalue) ? pvalue : 0);
data.BaseData.Direction = (decimal)(double.TryParse(options[6], out pvalue) ? pvalue : 0);
switch (options[0])
{
case "0":
case "1":
data.IsAlarm = false;
break;
case "2"://发生事件位置
switch (headers[0])
{
case "%AP"://报警通知
if (options[8] == "25")
data.IsAlarm = true;
break;
default:
data.IsAlarm = false;
break;
}
break;
default:
data = null;
break;
}
//过滤掉经纬度为0的记录
if (data.BaseData.Longitude == 0 || data.BaseData.Latitude == 0)
data = null;
return data;
}
catch { return null; }
}
/// <summary>
/// 检查异常漂移
/// </summary>
///<param name="obj">GPS信息</param>
/// <param name="aPreviousValidGPSData">有效的上一点GPS数据</param>
/// <param name="MaxSpeedMeterPerSecond">最大速度：米/秒</param>
private bool ComputeMileAgeAndVerifyData(ref YW3000Data aGPSInfo, GPSDataEntity aPreviousValidGPSData, double MaxSpeedMeterPerSecond)
{
bool flag = false;
if (aGPSInfo == null) return false;
if (aGPSInfo.BaseData.IsLocatedData == false)
{
return false;
}
//是否是第一个点
bool blnIsFirstGPSData = false;
if (aPreviousValidGPSData == null)
{
blnIsFirstGPSData = true;
}
TimeSpan dtSpan;
double dclMileage = 0;
bool blnIsGPSOverflow = false;
//是否要记录里程
bool blnShoudBeStillness = false;
//是否前条时间超过后一条时间
bool blnIsArrivalDelayed = false;
if (!blnIsFirstGPSData)
{
if (DateTime.Compare(aGPSInfo.BaseData.ReportTime, aPreviousValidGPSData.ReportTime) <= 0 || aGPSInfo.BaseData.ReportTime >= DateTime.Now.AddHours(1))
{
//当前时间小于上一点时间，为补传数据。2010-01-13 gxl 若当前数据时间大于服务器时间1小时，认为是异常数据，也标记为补传数据
aGPSInfo.BaseData.IsFetchData = true;
blnIsArrivalDelayed = true;
flag = true;
}
double CurrentLatitude =(double)aGPSInfo.BaseData.Latitude;
double CurrentLongitude =(double)aGPSInfo.BaseData.Longitude;
double LastLatitude = (double)aPreviousValidGPSData.Latitude;
double LastLongitude = (double)aPreviousValidGPSData.Longitude;
if ((CurrentLatitude != LastLatitude) || (CurrentLongitude != LastLongitude))
{
dclMileage =Transfer.GetDistance(LastLatitude, LastLongitude, CurrentLatitude, CurrentLongitude);
}
//计算当前点与其上一点之间的时间差
dtSpan = aGPSInfo.BaseData.ReportTime - aPreviousValidGPSData.ReportTime;
//两点之间最大比较里程
double dclMaxMileage = Math.Abs(Convert.ToDouble(MaxSpeedMeterPerSecond * dtSpan.TotalSeconds));
//最大比较速度:换算为公里/每小时
double maxSpeed = MaxSpeedMeterPerSecond * 3.6;
//速度过大或里程过大，均认为是漂移数据
if (dclMileage > dclMaxMileage || aGPSInfo.BaseData.Speed > (decimal)maxSpeed)
{
//异常：GPS漂移数据
blnIsGPSOverflow = true;
aGPSInfo.BaseData.IsOverflowGPSData = blnIsGPSOverflow;
}
//是否要记录里程
if ((aGPSInfo.BaseData.Speed == 0) && (aPreviousValidGPSData.Speed == 0) && (dtSpan.TotalMinutes < 30))
{
blnShoudBeStillness = true;
}
aGPSInfo.BaseData.StarkMileage = aPreviousValidGPSData.StarkMileage;
}
if (((!blnIsGPSOverflow) && (!blnIsFirstGPSData) && (!blnShoudBeStillness)) && (!blnIsArrivalDelayed))
{
aGPSInfo.BaseData.Mileage = (decimal)dclMileage;
aGPSInfo.BaseData.StarkMileage = aGPSInfo.BaseData.StarkMileage + aGPSInfo.BaseData.Mileage;
}
return flag;
}
