public static bool Is1A5(byte[] bytes, string fileExtension)
{
UInt16 satelliteId = ToLocalEndian.ToUInt16FromBig(new byte[] { bytes[0], bytes[1] });
if (satelliteId != 113 && satelliteId != 114)
{
return(false);
}
return(true);
}
private static D1A5Header CreateFileHeader(FileStream fs, BinaryReader br, int offset, int endOffset)
{
D1A5Header hInfo = new D1A5Header();
fs.Seek(offset, SeekOrigin.Begin);
hInfo.SatelliteIdentify = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.DataBeginYear = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.DataBeginMilliSecond = ToLocalEndian.ToUInt32FromBig(br.ReadBytes(4));
hInfo.DataBeginDayNums = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.DataEndYear = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.DataEndMilliSecond = ToLocalEndian.ToUInt32FromBig(br.ReadBytes(4));
hInfo.DataEndDayNums = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.RecordCount = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.LastRecord = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.ErrorFrameCount = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.BitErrorRatio = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
fs.Seek(2, SeekOrigin.Current);
hInfo.ErrorTimeOrder = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.LostRecordCount = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.SlopeAnalyseResult = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
fs.Seek(164, SeekOrigin.Current);
hInfo.TrackNumber = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.EpochTrackTime = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.Time = GetTime(hInfo.EpochTrackTime);
hInfo.OrbitSemiMajorAxis = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.OrbitEccentricity = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.OrbitInclination = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.LongitudeAscendingNode = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.PerigeeAngle = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.MeanAnomaly = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.AscDescendTag = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.ResurceType = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
hInfo.OrbitNumber = ToLocalEndian.ToUInt16FromBig(br.ReadBytes(2));
fs.Seek(2, SeekOrigin.Current);
hInfo.OrbitCycle = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
//角度信息
hInfo.Angles = GetAngles(br.ReadBytes(24));
fs.Seek(20, SeekOrigin.Current);
float[] lats, lons;
GetPosition(br.ReadBytes(32), out lats, out lons);
hInfo.Lats = lats;
hInfo.Lons = lons;
fs.Seek(4, SeekOrigin.Current);
hInfo.DataBeginSecond = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.DataEndSecond = ToLocalEndian.ToDouble64FromBig(br.ReadBytes(8));
hInfo.SatelliteName = hInfo.SatelliteIdentify == 113 ? "FY1C" : "FY1D";
hInfo.OrbitBeginTime = DateTime.Parse(hInfo.DataBeginYear.ToString() + "-01-01").AddDays(hInfo.DataBeginDayNums - 1).AddMilliseconds(hInfo.DataBeginMilliSecond);
return(hInfo);
}