public override void Project(IRasterDataProvider srcRaster, FilePrjSettings prjSettings, ISpatialReference dstSpatialRef, Action <int, string> progressCallback, double weight, float zoom)
{
ISpatialReference srcSpatialRef = srcRaster.SpatialRef;
_projectionTransform = ProjectionTransformFactory.GetProjectionTransform(srcSpatialRef, dstSpatialRef);
ArgsCheck(srcRaster, prjSettings, dstSpatialRef);
ReadySession(srcRaster, prjSettings, dstSpatialRef, progressCallback);
if (prjSettings.OutEnvelope == null || prjSettings.OutEnvelope == PrjEnvelope.Empty)
{
PrjEnvelope dstEnvelope = null;
float srcResolutionX = srcRaster.ResolutionX;
float srcResolutionY = srcRaster.ResolutionY;
double srcLeftTopX = srcRaster.CoordEnvelope.MinX;
double srcLeftTopY = srcRaster.CoordEnvelope.MaxY;
int srcWidth = srcRaster.Width;
int srcHeight = srcRaster.Height;
Size srcSize = new Size(srcWidth, srcHeight);
int wSample = 1;
int hSample = 1;
if (srcWidth > 1000)
{
wSample = srcWidth / 1000;
}
if (srcHeight > 1000)
{
hSample = srcHeight / 1000;
}
double[] xs = new double[(srcWidth / wSample) * (srcHeight / hSample)];
double[] ys = new double[(srcWidth / wSample) * (srcHeight / hSample)];
int index = 0;//非真实的索引号，采样后的
for (int rowInx = 0; rowInx <= (srcHeight - hSample); rowInx += hSample)
{
for (int colInx = 0; colInx <= (srcWidth - wSample); colInx += wSample)
{
xs[index] = srcLeftTopX + colInx * srcResolutionX;
ys[index] = srcLeftTopY - rowInx * srcResolutionY;
index++;
}
}
_rasterProjector.ComputeDstEnvelope(srcSpatialRef, xs, ys, srcSize, dstSpatialRef, out dstEnvelope, null);
prjSettings.OutEnvelope = dstEnvelope;
}
GC.Collect();
ProjectToLDF(srcRaster, prjSettings, dstSpatialRef, progressCallback, weight, zoom);
}
private void TestProj()
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
Size srSize = Size.Empty;
Double[] lats = null;
Double[] longs = null;
using (IRasterDataProvider srcPrd = GeoDataDriver.Open(@"D:\masData\FY3A_VIRRX_GBAL_L1_20110322_0525_1000M_MS.HDF") as IRasterDataProvider)
{
using (IBandProvider srcbandpro = srcPrd.BandProvider as IBandProvider)
{
srSize = new System.Drawing.Size(srcPrd.Width, srcPrd.Height);
lats = new Double[srcPrd.Width * srcPrd.Height];
longs = new Double[srcPrd.Width * srcPrd.Height];
using (IRasterBand latBand = srcbandpro.GetBands("Latitude")[0])
{
using (IRasterBand lonsBand = srcbandpro.GetBands("Longitude")[0])
{
unsafe
{
fixed(Double *ptrLat = lats)
{
fixed(Double *ptrLong = longs)
{
IntPtr bufferPtrLat = new IntPtr(ptrLat);
IntPtr bufferPtrLong = new IntPtr(ptrLong);
latBand.Read(0, 0, srcPrd.Width, srcPrd.Height, bufferPtrLat, enumDataType.Double, srcPrd.Width, srcPrd.Height);
lonsBand.Read(0, 0, srcPrd.Width, srcPrd.Height, bufferPtrLong, enumDataType.Double, srcPrd.Width, srcPrd.Height);
}
}
}
}
}
stopwatch.Stop();
WriteLine("读取经纬度{0}ms", stopwatch.ElapsedMilliseconds);
stopwatch.Restart();
IRasterProjector raster = new RasterProjector();
PrjEnvelope destEnvelope;
Action <int, string> progressCallback = new Action <int, string>(OutProgress);
//progressCallback = null; //测试不用进度条的情况
ISpatialReference srcSpatialRef = SpatialReferenceFactory.GetSpatialReferenceByPrjFile("WGS 1984.prj");
ISpatialReference dstSpatialRef = SpatialReferenceFactory.GetSpatialReferenceByPrjFile("ChinaBoundary.prj");
raster.ComputeDstEnvelope(srcSpatialRef, longs, lats, srSize, dstSpatialRef, out destEnvelope, progressCallback);
stopwatch.Stop();
WriteLine("计算范围{0}ms", stopwatch.ElapsedMilliseconds);
WriteLine("范围{0}", destEnvelope.ToString());
Size dstSize = new Size((int)(destEnvelope.Width / 0.01), (int)(destEnvelope.Height / 0.01));
UInt16[] dstRowLookUpTable = new UInt16[dstSize.Width * dstSize.Height];
UInt16[] dstColLookUpTable = new UInt16[dstSize.Width * dstSize.Height];
raster.ComputeIndexMapTable(srcSpatialRef, longs, lats, srSize, dstSpatialRef, dstSize, destEnvelope,
out dstRowLookUpTable, out dstColLookUpTable, progressCallback);
stopwatch.Stop();
WriteLine("计算投影查找表{0}ms", stopwatch.ElapsedMilliseconds);
stopwatch.Restart();
int srcBandCount = srcPrd.BandCount;
using (IRasterDataDriver drv = GeoDataDriver.GetDriverByName("LDF") as IRasterDataDriver)
{
string proj4 = dstSpatialRef.ToProj4String();
using (IRasterDataProvider prdWriter = drv.Create(@"d:\Myproj4LutX.ldf", dstSize.Width, dstSize.Height, srcBandCount,
enumDataType.UInt16, "INTERLEAVE=BSQ", "VERSION=LDF", "SPATIALREF=" + proj4) as IRasterDataProvider)
{
UInt16[] dstData = new UInt16[dstSize.Width * dstSize.Height];
UInt16[] srcData = new UInt16[srSize.Width * srSize.Height];
//int perProgress = 0;
//int curProgress = 0;
for (int i = 0; i < srcBandCount; i++)
{
using (IRasterBand latBand = srcPrd.GetRasterBand(i + 1))
{
unsafe
{
fixed(UInt16 *ptr = srcData)
{
IntPtr bufferptr = new IntPtr(ptr);
latBand.Read(0, 0, srSize.Width, srSize.Height, bufferptr, enumDataType.UInt16, srSize.Width, srSize.Height);
}
}
}
//stopwatch.Stop();
//WriteLine("读取一个通道{0}ms,通道索引{1}", stopwatch.ElapsedMilliseconds, i + 1);
//stopwatch.Restart();
raster.Project <UInt16>(srcData, srSize, dstRowLookUpTable, dstColLookUpTable, dstSize, dstData, 0, progressCallback);
//stopwatch.Stop();
//WriteLine("投影一个通道{0}ms,通道索引{1}", stopwatch.ElapsedMilliseconds, i + 1);
//stopwatch.Restart();
using (IRasterBand band = prdWriter.GetRasterBand(i + 1))
{
unsafe
{
fixed(UInt16 *ptr = dstData)
{
IntPtr bufferPtr = new IntPtr(ptr);
band.Write(0, 0, band.Width, band.Height, bufferPtr, enumDataType.UInt16, band.Width, band.Height);
}
}
}
//curProgress = (i+1) * 100 / srcBandCount;
//if (progressCallback != null && curProgress > perProgress)
//{
// progressCallback(curProgress, "");
// perProgress = curProgress;
//}
//stopwatch.Stop();
//WriteLine("写出一个通道{0}ms", stopwatch.ElapsedMilliseconds);
//stopwatch.Restart();
}
}
}
stopwatch.Stop();
WriteLine("投影完所有通道{0}ms", stopwatch.ElapsedMilliseconds);
stopwatch.Restart();
}
}
}