public LogicalRasterDataProvider(string fileName, string[] fnames, object tag)
{
if (fnames == null || fnames.Length == 0)
{
throw new ArgumentNullException("fnames");
}
_tag = tag;
_fileNames = new string[fnames.Length + 1];
_fileNames[0] = fileName;
int i = 1;
bool isFirst = true;
foreach (string fname in fnames)
{
_fileNames[i++] = fname;
IRasterDataProvider prd = GeoDataDriver.Open(fname) as IRasterDataProvider;
if (prd == null)
{
continue;
}
if (isFirst)
{
_dataType = prd.DataType;
_width = prd.Width;
_height = prd.Height;
_coordEnvelope = prd.CoordEnvelope;
_coordType = prd.CoordType;
_spatialRef = prd.SpatialRef;
_coordTransform = prd.CoordTransform;
isFirst = false;
}
else
{
if (_dataType != prd.DataType ||
_coordType != prd.CoordType ||
!CoordEnvelopeEquals(_coordEnvelope, prd.CoordEnvelope) ||
_coordType != prd.CoordType ||
_width != prd.Width ||
_height != prd.Height ||
!_spatialRef.IsSame(prd.SpatialRef)
)
{
continue;
}
}
for (int b = 0; b < prd.BandCount; b++)
{
IRasterBand band = prd.GetRasterBand(b + 1);
band.Description = prd.fileName;
_rasterBands.Add(band);
band.BandNo = _rasterBands.Count;
}
_needDisposeObjects.Add(prd);
}
}
public IRasterDataProvider ConvertDataType <TSrc, TDst>(string srcFileName, enumDataType dstDataType, string dstFileName, Func <TSrc, TDst> converter)
{
IRasterDataProvider srcDataProvider = GeoDataDriver.Open(srcFileName) as IRasterDataProvider;
if (srcDataProvider == null)
{
new Exception("创建源数据提供者时发生错误！");
}
try
{
return(ConvertDataType <TSrc, TDst>(srcDataProvider, dstDataType, dstFileName, converter));
}
finally
{
srcDataProvider.Dispose();
}
}
private IRasterDataProvider CreateDstDataProvider(enumDataType dstDataType, IRasterDataProvider srcDataProvider, string dstFileName)
{
IRasterDataDriver driver = GeoDataDriver.GetDriverByName("LDF") as IRasterDataDriver;
if (driver == null)
{
throw new Exception("获取LDF栅格数据驱动时发生未知错误!");
}
if (!dstFileName.ToLower().EndsWith(".ldf"))
{
dstFileName += ".ldf";
}
return(driver.Create(dstFileName, srcDataProvider.Width,
srcDataProvider.Height,
srcDataProvider.BandCount,
dstDataType,
"SPATIALREF=" + GetSpatialRefString(srcDataProvider),
GetMapInfoString(srcDataProvider.CoordEnvelope, srcDataProvider.Width, srcDataProvider.Height)));
}