向各为大侠请教一下Tin转Raster的问题，下面是我用C#写的函数，转出来的Raster高程值不知为何老是范围巨大无比，完全是错误的，哎```希望有大侠能给我指出错误所在，不胜感激。
public void TintoRaster(ITinAdvanced ipT)
{
IGeoDataset pInTin = (IGeoDataset)ipT;
IEnvelope pExtent;
pExtent = pInTin.Extent;
IPoint pOrigin;
pOrigin = pExtent.LowerLeft;
double x,y;
x = pOrigin.X;
y = pOrigin.Y;
pOrigin.X = x - edit_viewshedCellsize * 0.5;
pOrigin.Y = y - edit_viewshedCellsize * 0.5;
int nCol,nRow;
double width,height;
width = pExtent.Width;
height = pExtent.Height;
nCol = (int)Math.Round((width / edit_viewshedCellsize) + 1);
nRow = (int)Math.Round((height / edit_viewshedCellsize) + 1);
ISpatialReference2 pSR;
pSR = (ISpatialReference2)pInTin.SpatialReference;
IRasterDataset pRDS;
IWorkspaceFactory rWksFac = new RasterWorkspaceFactoryClass();
IWorkspace wks;
wks = rWksFac.OpenFromFile(m_OutputPath,0);
IRasterWorkspace2 rWks = (IRasterWorkspace2)wks;
int numbands = 1;
//try
//{
pRDS = rWks.CreateRasterDataset("tempTtoR","GRID",pOrigin,nCol,nRow,edit_viewshedCellsize,edit_viewshedCellsize,numbands,rstPixelType.PT_LONG,pSR,true);
//}
//catch
//{
//return;
//}
//下面是调用GetRawPixels函数
IRasterBandCollection pBandCollection = (IRasterBandCollection)pRDS;
IRasterBand pRasterBand;
pRasterBand = pBandCollection.Item(0);
IRawPixels pRawPixels = (IRawPixels)pRasterBand;
object pCache;
pCache = pRawPixels.AcquireCache();
ITinSurface pTinSurf = (ITinSurface)ipT;
IRasterProps pRasterProps = (IRasterProps)pRawPixels;
object nodataInt;
nodataInt = pRasterProps.NoDataValue;
// object nodataFloat;
// double dZMin;
// dZMin = pExtent.ZMin;
// float a;
// a = (float)(dZMin - 1);
// nodataFloat = (object)a;
// pRasterProps.NoDataValue = nodataFloat;
int mxblk_x = 2048;
int mxblk_y = 2048;
if(nCol < mxblk_x) mxblk_x = nCol;
if(nRow < mxblk_y) mxblk_y = nRow;
IPnt pBlockSize = new DblPntClass();
IPnt pOffset = new DblPntClass();
pBlockSize.X = mxblk_x;
pBlockSize.Y = mxblk_y;
IPixelBlock3 pPixelBlock;
pPixelBlock = (IPixelBlock3)pRawPixels.CreatePixelBlock(pBlockSize);
object blockArray;
//blockArray = pPixelBlock.get_SafeArray(0);
blockArray = pPixelBlock.get_PixelDataByRef(0);
IPoint blkOrigin = new PointClass();
int iRowOffset;
int iColOffset;
for(iRowOffset = 0;iRowOffset < nRow;iRowOffset += mxblk_y)
{
for(iColOffset = 0;iColOffset < nCol;iColOffset += mxblk_x)
{
if((nCol - iColOffset) < mxblk_x)
{
pBlockSize.X = nCol - iColOffset;
pPixelBlock = (IPixelBlock3)pRawPixels.CreatePixelBlock(pBlockSize);
blockArray = pPixelBlock.get_PixelDataByRef(0);
}
blkOrigin.X = pOrigin.X + iColOffset * edit_viewshedCellsize + edit_viewshedCellsize * 0.5;
blkOrigin.Y = pOrigin.Y + (nRow - iRowOffset) * edit_viewshedCellsize - edit_viewshedCellsize * 0.5;
pTinSurf.QueryPixelBlock(blkOrigin.X,blkOrigin.Y,edit_viewshedCellsize,edit_viewshedCellsize,esriRasterizationType.esriElevationAsRaster,nodataInt,blockArray);
pOffset.X = iColOffset;
pOffset.Y = iRowOffset;
pRawPixels.Write(pOffset,(IPixelBlock)pPixelBlock);
}
bool reset = false;
if(pBlockSize.X != mxblk_x)
{
pBlockSize.X = mxblk_x;
reset = true;
}
if((nRow - iRowOffset) < mxblk_y)
{
pBlockSize.Y = nRow - iRowOffset;
reset = true;
}
if(reset)
{
pPixelBlock = (IPixelBlock3)pRawPixels.CreatePixelBlock(pBlockSize);
blockArray = pPixelBlock.get_PixelDataByRef(0);
}
}
//x = pOrigin.X;
//y = pOrigin.Y;
//pOrigin.X = x + edit_viewshedCellsize * 0.5;
//pOrigin.Y = y + edit_viewshedCellsize * nRow - edit_viewshedCellsize * 0.5;
//x = pOrigin.X;
//y = pOrigin.Y;
//pTinSurf.QueryPixelBlock(x,y,edit_viewshedCellsize,edit_viewshedCellsize,esriRasterizationType.esriElevationAsRaster,nodataFloat,val);
//IPnt pOffset = new DblPntClass();
//pOffset.X = 0;
//pOffset.Y = 0;
//pRawPixels.Write(pOffset,pPixelBlock);
pRawPixels.ReturnCache(pCache);
pCache = null;
}
