public static Ldf1Header MvgHeaderToLdfHeader(MvgHeader mvgHeader)
{
Ldf1Header ldfHeader = new Ldf1Header();
FillLdfHeaderAttributes(mvgHeader, ldfHeader);
return(ldfHeader);
}
public static void FillMvgHeader(Ldf1Header ldfHeader, MvgHeader mvgHeader)
{
mvgHeader.CreatedDateTime = ldfHeader.YMDHM;
mvgHeader.ProjectType = ldfHeader.ProjectType;
mvgHeader.Width = (Int16)ldfHeader.Width;
mvgHeader.Height = (Int16)ldfHeader.Height;
mvgHeader.LongitudeResolution = ldfHeader.LonSolution;
mvgHeader.LatitudeResolution = ldfHeader.LatSolution;
mvgHeader.StandardLatitude1 = ldfHeader.StandardLat1;
mvgHeader.StandardLatitude2 = ldfHeader.StandardLat2;
mvgHeader.EarthRadius = ldfHeader.EarthRadius;
mvgHeader.MinLat = ldfHeader.MinLat;
mvgHeader.MaxLat = ldfHeader.MaxLat;
mvgHeader.MinLon = ldfHeader.MinLon;
mvgHeader.MaxLon = ldfHeader.MaxLon;
mvgHeader.IsExtend = ldfHeader.IsExtended;
mvgHeader.SpatialRef = ldfHeader.SpatialRef;
if (ldfHeader.IsExtended)
{
mvgHeader.GeoDoIdentify = ldfHeader.GeoDoIdentify;
mvgHeader.PrjId = ldfHeader.PrjId;
mvgHeader.A = ldfHeader.A;
mvgHeader.B = ldfHeader.B;
mvgHeader.Sp1 = ldfHeader.Sp1;
mvgHeader.Sp2 = ldfHeader.Sp2;
mvgHeader.Lat0 = ldfHeader.Lat0;
mvgHeader.Lon0 = ldfHeader.Lon0;
mvgHeader.X0 = ldfHeader.X0;
mvgHeader.Y0 = ldfHeader.Y0;
mvgHeader.K0 = ldfHeader.K0;
}
}
private static void GetLdfHeaderSpatialRef(MvgHeader mvgHeader, Ldf1Header ldfHeader)
{
if (mvgHeader.Version == 3)
{
GetLdfHeaderSpatialRefByExtend(mvgHeader, ldfHeader);
}
}
//适用于打开文件的情况
public MvgDataProvider(string fileName, IGeoDataDriver dataDriver, bool isReadOnly)
: base(fileName, dataDriver)
{
_driver = dataDriver;
_fileName = fileName;
string hdrfile = HdrFile.GetHdrFileName(_fileName);
if (File.Exists(hdrfile))
{
_filelist = new string[] { _fileName, hdrfile }
}
;
else
{
_filelist = new string[] { _fileName }
};
_header = new MvgHeader(fileName);
FillProviderAttributes();
_fsStream = new FileStream(_fileName, FileMode.Open, isReadOnly ? FileAccess.Read : FileAccess.ReadWrite);
if (!isReadOnly)
{
_binaryWriter = new BinaryWriter(_fsStream);
}
_binaryReader = new BinaryReader(_fsStream);
LoadBands();
}
private static void GetLdfHeaderSpatialRefByExtend(MvgHeader mvgHeader, Ldf1Header ldfHeader)
{
ldfHeader.GeoDoIdentify = mvgHeader.GeoDoIdentify;
ldfHeader.PrjId = mvgHeader.PrjId;
ldfHeader.A = mvgHeader.A;
ldfHeader.B = mvgHeader.B;
ldfHeader.Sp1 = mvgHeader.Sp1;
ldfHeader.Sp2 = mvgHeader.Sp2;
ldfHeader.Lat0 = mvgHeader.Lat0;
ldfHeader.Lon0 = mvgHeader.Lon0;
ldfHeader.X0 = mvgHeader.X0;
ldfHeader.Y0 = mvgHeader.Y0;
ldfHeader.K0 = mvgHeader.K0;
}
public MvgRasterBand(IRasterDataProvider rasterDataProvider, BinaryReader binaryReader, BinaryWriter binaryWriter, FileStream fileStream)
: base(rasterDataProvider)
{
_rasterDataProvider = rasterDataProvider;
_fileStream = fileStream;
_binaryReader = binaryReader;
_binaryWriter = binaryWriter;
_bandNo = 1;
_dataType = enumDataType.Int16;
_header = (rasterDataProvider as IMvgDataProvider).Header;
_spatialRef = (rasterDataProvider as IMvgDataProvider).Header.SpatialRef;
_width = (rasterDataProvider as IMvgDataProvider).Width;
_height = (rasterDataProvider as IMvgDataProvider).Height;
//_noDataValue
//CoordTransform
//MaxByMeasureBits
}
private MvgHeader CreateMvgHeader(int xSize, int ySize, ISpatialReference spatialRef, HdrMapInfo mapInfo, Int16 valueCount, Int16[] values, string[] valueNames)
{
if (values == null || valueNames == null || valueCount == 0)
{
throw new NotSupportedException("所给参数(values,valueNames,valueCount)不完整！");
}
MvgHeader mvgHeader = new MvgHeader();
mvgHeader.Width = (Int16)xSize;
mvgHeader.Height = (Int16)ySize;
mvgHeader.SpatialRef = spatialRef;
mvgHeader.ValueCount = valueCount;
mvgHeader.Values = values;
mvgHeader.ValueNames = valueNames;
mvgHeader.SetMapInfo(mapInfo);
return(mvgHeader);
}
private static void FillLdfHeaderAttributes(MvgHeader mvgHeader, Ldf1Header ldfHeader)
{
//ldfHeaderBase 成员
ldfHeader._channelCount = 1;
ldfHeader._dataType = (Int16)LdfHeaderBase.DataTypeToIntValue(typeof(Int16));
ldfHeader._width = (UInt16)mvgHeader.Width;
ldfHeader._height = (UInt16)mvgHeader.Height;
ldfHeader._headerSize = 128;
ldfHeader._interleave = (Int16)LdfHeaderBase.InterleaveToInt(enumInterleave.BSQ);
//ldf1Header成员
ldfHeader.FileIdentify = "LA";
ldfHeader.YMDHM = mvgHeader.CreatedDateTime;
ldfHeader.ProjectType = mvgHeader.ProjectType;
ldfHeader.LonSolution = mvgHeader.LongitudeResolution;
ldfHeader.LatSolution = mvgHeader.LatitudeResolution;
ldfHeader.StandardLat1 = mvgHeader.StandardLatitude1;
ldfHeader.StandardLat2 = mvgHeader.StandardLatitude2;
ldfHeader.EarthRadius = mvgHeader.EarthRadius;
ldfHeader.MinLat = mvgHeader.MinLat;
ldfHeader.MaxLat = mvgHeader.MaxLat;
ldfHeader.MinLon = mvgHeader.MinLon;
ldfHeader.MaxLon = mvgHeader.MaxLon;
GetLdfHeaderSpatialRef(mvgHeader, ldfHeader);
}
protected override bool IsCompatible(string fileName, byte[] header1024, params object[] args)
{
string fileExtension = Path.GetExtension(fileName).ToUpper();
return(MvgHeader.IsMVG(header1024, fileExtension));
}
private IGeoDataProvider BuildDataProviderByArgs(string fileName, enumDataProviderAccess access, MvgHeader mvgHeader)
{
return(new MvgDataProvider(fileName, this as RasterDataDriver, mvgHeader, access == enumDataProviderAccess.ReadOnly));
}
