矢量裁剪栅格（过滤）（c#）

IClipFilter clipRaster = new ClipFilterClass();

      //Add the polygons from the shapefile to the clip filer
      IGeometry clipGeometry;
      IFeature feature;
      for ( int i = 0; i <= featureClass.FeatureCount( null) - 1; i++)
      {
        feature = featureClass.GetFeature(i);
        clipGeometry = (IGeometry)feature.Shape;
        clipRaster.Add(clipGeometry);
      }

      //Set the filter to the raster
      IPixelOperation pixelOp = (IPixelOperation)raster;
      pixelOp.PixelFilter = (IPixelFilter)clipRaster;

      //Now we need to specify properties for the output. The output can
      //be a file format or a geodatabase. This sample supports output
      //to File geodatabase and Personal Geodatabase.
      //If the output is a file format and input raster does not contain NoData and the max value
      //of the pixel depth is being used. (For example 255 is used for
      //8 bit unsigned case), output pixel depth needs to be promoted and NoData
      //value need to set up properly.

      IWorkspace workSpace = openWorkspace(outputFolder);
      IRasterProps rasterProps = (IRasterProps)raster;

      if (workSpace.PathName.Contains( ".gdb") == false)
      {
        rasterProps.NoDataValue = 256;
        rasterProps.PixelType = rstPixelType.PT_USHORT;
      }

      //Save the result out
      ISaveAs saveas = (ISaveAs)raster;
      saveas.SaveAs(outputFile, workSpace, Format);