public AbstractWarpDataset Clip(AbstractWarpDataset srcRaster, BlockDef blockDefs, int samplePercent,
string driver, string outdir, Action <int, string> progressCallback, out double validPercent,
params object[] options)
{
AbstractWarpDataset tProviders = null;
if (progressCallback != null)
{
progressCallback(0, "开始数据分幅");
}
//位置映射参数
int tBeginRow = -1, tEndRow = -1, tBeginCol = -1, tEndCol = -1;
int oBeginRow = -1, oEndRow = -1, oBeginCol = -1, oEndCol = -1;
Envelope oEnvelope = srcRaster.GetEnvelope();
Envelope tEnvelope = blockDefs.ToEnvelope();
Size oSize = new Size(srcRaster.Width, srcRaster.Height);
Size tSize = ClipCutHelper.GetTargetSize(blockDefs, srcRaster.ResolutionX, srcRaster.ResolutionY);
bool isInternal = new RasterMoasicClipHelper().ComputeBeginEndRowCol(oEnvelope, oSize, tEnvelope, tSize,
ref oBeginRow, ref oBeginCol, ref oEndRow, ref oEndCol,
ref tBeginRow, ref tBeginCol, ref tEndRow, ref tEndCol);
string blockFilename = ClipCutHelper.GetBlockFilename(blockDefs, srcRaster.fileName, outdir, driver);
int oWidth = 0;
int oHeight = 0;
float tResolutionX;
float tResolutionY;
if (samplePercent > 0 && samplePercent < 100)
{
oHeight = (int)(tSize.Width * samplePercent * 1f / 100 + 0.5);
oWidth = (int)(tSize.Width * samplePercent * 1f / 100 + 0.5);
tResolutionX = srcRaster.ResolutionX * samplePercent * 1f / 100;
tResolutionY = srcRaster.ResolutionY * samplePercent * 1f / 100;
}
else
{
oHeight = tSize.Height;
oWidth = tSize.Width;
tResolutionX = srcRaster.ResolutionX;
tResolutionY = srcRaster.ResolutionY;
}
string[] optionString = new string[]
{
"INTERLEAVE=BSQ",
"VERSION=LDF",
"WITHHDR=TRUE",
"SPATIALREF=" + srcRaster.SpatialRef.ExportToProj4(),
"MAPINFO={" + 1 + "," + 1 + "}:{" + tEnvelope.MinX + "," + tEnvelope.MaxY + "}:{" + tResolutionX + "," +
tResolutionY + "}"
};
string[] _options = new string[] { "header_offset=128" };
double[] geoTrans = new double[]
{
tEnvelope.MinX, Convert.ToDouble(tResolutionX.ToString("f6")), 0, tEnvelope.MaxY, 0,
-Convert.ToDouble(tResolutionY.ToString("f6"))
};
var rDs = DatasetFactory.CreateRasterDataset(blockFilename, oWidth, oHeight, srcRaster.BandCount,
srcRaster.DataType, "ENVI", null);
rDs.SetGeoTransform(geoTrans);
rDs.SetProjection(srcRaster.SpatialRef.ExportToWkt());
tProviders = new WarpDataset(rDs, blockFilename);
int rowStep = ClipCutHelper.ComputeRowStep(srcRaster, oBeginRow, oEndRow);
int sample = (oEndCol - oBeginCol);
int typeSize = ClipCutHelper.GetSize(srcRaster.DataType);
long allPixelByte = sample * (oEndRow - oBeginRow) * typeSize * srcRaster.BandCount;
long validPixelByte = 0;
long validPer = (int)(allPixelByte * 0.1f);
int stepCount = (int)((oEndRow - oBeginRow) / rowStep + 0.5) * srcRaster.BandCount;
int step = 0;
int percent = 0;
for (int oRow = oBeginRow; oRow < oEndRow; oRow += rowStep)
{
if (oRow + rowStep > oEndRow)
{
rowStep = oEndRow - oRow;
}
for (int bandIndex = 0; bandIndex < srcRaster.BandCount; bandIndex++)
{
step++;
percent = (int)(step * 1.0f / stepCount * 100);
if (progressCallback != null)
{
progressCallback(percent, "完成数据分幅" + percent + "%");
}
int bufferSize = sample * rowStep * typeSize;
byte[] databuffer = new byte[bufferSize];
unsafe
{
fixed(byte *ptr = databuffer)
{
IntPtr buffer = new IntPtr(ptr);
srcRaster.GetRasterBand(bandIndex).ReadRaster(oBeginCol, oRow, sample, rowStep, buffer, sample,
rowStep, srcRaster.DataType, 0, 0);
if (validPixelByte < validPer)
{
foreach (byte b in databuffer)
{
if (b != 0)
{
validPixelByte++;
}
}
}
if (validPixelByte == 0)
{
continue;
}
if (samplePercent > 0 && samplePercent < 100)
{
tProviders.GetRasterBand(bandIndex).WriteRaster(
(int)(tBeginCol * samplePercent * 1f / 100 + 0.5),
(int)((tBeginRow + (oRow - oBeginRow)) * samplePercent * 1f / 100 + 0.5),
(int)(sample * samplePercent * 1f / 100 + 0.5),
(int)(rowStep * samplePercent * 1f / 100 + 0.5), buffer,
(int)(sample * samplePercent * 1f / 100 + 0.5),
(int)(rowStep * samplePercent * 1f / 100 + 0.5), srcRaster.DataType, 0, 0);
}
else
{
tProviders.GetRasterBand(bandIndex).WriteRaster(tBeginCol, tBeginRow + (oRow - oBeginRow),
sample, rowStep, buffer, sample, rowStep, srcRaster.DataType, 0, 0);
}
}
}
}
}
validPercent = validPixelByte * 1.0d / allPixelByte;
if (progressCallback != null)
{
progressCallback(100, "完成数据分幅");
}
return(tProviders);
}
