/// <summary>
/// 0、先生成目标文件，以防止目标空间不足。
/// 1、计算查找表
/// 2、对所有波段执行投影
/// </summary>
private void ProjectToLDF(IRasterDataProvider srcRaster, FY3_VIRR_PrjSettings prjSettings, ISpatialReference dstSpatialRef, Action <int, string> progressCallback)
{
string outFormat = prjSettings.OutFormat;
string outfilename = prjSettings.OutPathAndFileName;
string dstProj4 = dstSpatialRef.ToProj4String();
List <BandMap> bandMaps = prjSettings.BandMapTable;
int dstBandCount = bandMaps.Count;
Size srcSize = new Size(srcRaster.Width, srcRaster.Height);
Size dstSize = prjSettings.OutSize;
using (IRasterDataDriver drv = GeoDataDriver.GetDriverByName("LDF") as IRasterDataDriver)
{
PrjEnvelope dstEnvelope = prjSettings.OutEnvelope;
string mapInfo = "MAPINFO={" + 1 + "," + 1 + "}:{" + dstEnvelope.MinX + "," + dstEnvelope.MaxY + "}:{" + prjSettings.OutResolutionX + "," + prjSettings.OutResolutionY + "}";
using (IRasterDataProvider prdWriter = drv.Create(outfilename, dstSize.Width, dstSize.Height, dstBandCount,
enumDataType.UInt16, "INTERLEAVE=BSQ", "VERSION=LDF", "SPATIALREF=" + dstProj4, mapInfo, "WITHHDR=TRUE") as IRasterDataProvider)
{
//计算查找表
//ISpatialReference srcSpatialRef = srcRaster.SpatialRef;
UInt16[] dstRowLookUpTable = new UInt16[dstSize.Width * dstSize.Height];
UInt16[] dstColLookUpTable = new UInt16[dstSize.Width * dstSize.Height];
_rasterProjector.ComputeIndexMapTable(_xs, _ys, srcSize, dstSize, dstEnvelope, _maxPrjEnvelope,
out dstRowLookUpTable, out dstColLookUpTable, progressCallback);
//执行投影
UInt16[] srcBandData = new UInt16[srcSize.Width * srcSize.Height];
UInt16[] dstBandData = new UInt16[dstSize.Width * dstSize.Height];
int progress = 0;
for (int i = 0; i < dstBandCount; i++) //读取原始通道值，投影到目标区域
{
if (progressCallback != null)
{
progress = (int)((i + 1) * 100 / dstBandCount);
progressCallback(progress, string.Format("投影第{0}共{1}通道", i + 1, dstBandCount));
}
BandMap bandMap = bandMaps[i];
ReadBandData(srcBandData, bandMap.File, bandMap.DatasetName, bandMap.BandIndex, srcSize);
if (prjSettings.IsRadiation)
{
DoRadiation(srcBandData, srcSize, bandMap.DatasetName, bandMap.BandIndex, prjSettings.IsSolarZenith);
}
_rasterProjector.Project <UInt16>(srcBandData, srcSize, dstRowLookUpTable, dstColLookUpTable, dstSize, dstBandData, 0, progressCallback);
using (IRasterBand band = prdWriter.GetRasterBand(i + 1))
{
unsafe
{
fixed(UInt16 *ptr = dstBandData)
{
IntPtr bufferPtr = new IntPtr(ptr);
band.Write(0, 0, band.Width, band.Height, bufferPtr, enumDataType.UInt16, band.Width, band.Height);
}
}
}
}
}
}
}
private void ProjectToLDF0500(IRasterDataProvider srcRaster, Size srcLocationSize, EOS_MODIS_PrjSettings prjSettings, ISpatialReference dstSpatialRef, Action <int, string> progressCallback)
{
if (srcRaster == null || srcRaster.Width == 0 || srcRaster.Height == 0)
{
throw new Exception("投影250米MERSI数据失败：无法读取源数据,或者源数据高或宽为0。");
}
Size srcDataSize = new Size(srcRaster.Width, srcRaster.Height);
string outFormat = prjSettings.OutFormat;
string outfilename = prjSettings.OutPathAndFileName;
string dstProj4 = dstSpatialRef.ToProj4String();
List <BandMap> bandMaps = prjSettings.BandMapTable;
int dstBandCount = bandMaps.Count;
Size dstSize = prjSettings.OutSize;
using (IRasterDataDriver drv = GeoDataDriver.GetDriverByName("LDF") as IRasterDataDriver)
{
PrjEnvelope dstEnvelope = prjSettings.OutEnvelope;
string mapInfo = "MAPINFO={" + 1 + "," + 1 + "}:{" + dstEnvelope.MinX + "," + dstEnvelope.MaxY + "}:{" + prjSettings.OutResolutionX + "," + prjSettings.OutResolutionY + "}";
using (IRasterDataProvider prdWriter = drv.Create(outfilename, dstSize.Width, dstSize.Height, dstBandCount,
enumDataType.UInt16, "INTERLEAVE=BSQ", "VERSION=LDF", "SPATIALREF=" + dstProj4, mapInfo, "WITHHDR=TRUE") as IRasterDataProvider)
{
//考虑分块
float outResolutionX = prjSettings.OutResolutionX;
float outResolutionY = prjSettings.OutResolutionY;
Size outSize = dstEnvelope.GetSize(outResolutionX, outResolutionY);
#region 计算分块个数、分块高宽
int blockXNum;
int blockYNum;
int blockWidth;
int blockHeight;
GetBlockNumber(outSize, out blockXNum, out blockYNum, out blockWidth, out blockHeight);
#endregion
Size blockSize = new Size(blockWidth, blockHeight);
for (int blockYIndex = 0; blockYIndex < blockYNum; blockYIndex++)
{
for (int blockXIndex = 0; blockXIndex < blockXNum; blockXIndex++)
{
//当前块的四角范围
double blockMinX = dstEnvelope.MinX + blockWidth * outResolutionX * blockXIndex;
double blockMaxX = blockMinX + blockWidth * outResolutionX;
double blockMaxY = dstEnvelope.MaxY - blockHeight * outResolutionY * blockYIndex;
double blockMinY = blockMaxY - blockHeight * outResolutionY;
PrjEnvelope blockEnvelope = new PrjEnvelope(blockMinX, blockMaxX, blockMinY, blockMaxY);
UInt16[] dstRowLookUpTable = new UInt16[blockWidth * blockHeight];
UInt16[] dstColLookUpTable = new UInt16[blockWidth * blockHeight];
_rasterProjector.ComputeIndexMapTable(_xs, _ys, srcLocationSize, srcDataSize, blockSize, blockEnvelope,
out dstRowLookUpTable, out dstColLookUpTable, progressCallback);
//执行投影
UInt16[] srcBandData = null;
UInt16[] dstBandData = new UInt16[blockWidth * blockHeight];
for (int i = 0; i < dstBandCount; i++) //读取原始通道值，投影到目标区域
{
BandMap bandMap = bandMaps[i];
ReadBandData(out srcBandData, bandMap.File, bandMap.DatasetName, bandMap.BandIndex, srcDataSize);
if (prjSettings.IsRadiation) //亮温转换，这里处理的不好，如果是做了一个小块的分幅，这里花的代价太高,
{
DoRadiation(srcBandData, srcDataSize, srcLocationSize, bandMap.DatasetName, bandMap.BandIndex, srcRaster, prjSettings.IsRadiation, prjSettings.IsSolarZenith);
}
_rasterProjector.Project <UInt16>(srcBandData, srcDataSize, dstRowLookUpTable, dstColLookUpTable, blockSize, dstBandData, 0, progressCallback);
using (IRasterBand band = prdWriter.GetRasterBand(i + 1))
{
unsafe
{
fixed(UInt16 *ptr = dstBandData)
{
IntPtr bufferPtr = new IntPtr(ptr);
int blockOffsetY = blockYIndex * blockSize.Height;
int blockOffsetX = blockWidth * blockXIndex;
band.Write(blockOffsetX, blockOffsetY, blockWidth, blockHeight, bufferPtr, enumDataType.UInt16, blockWidth, blockHeight);
}
}
}
}
}
}
}
}
}