ArcObjects 波段合成

可以用地理处理

CompositeBands

Creates a single raster dataset from multiple bands and can also create a raster dataset using only a subset of bands.

也可以不用，贴代码了

public static IRaster toColor(IRaster raster, ITable redTable, ITable greenTable, ITable blueTable)
        {
            IReclassOp reclassOp = new RasterReclassOpClass();
            IGeoDataset red = reclassOp.Reclass(raster as IGeoDataset, redTable, "FromField",
                "ToField", "OutField", true);
            IGeoDataset green = reclassOp.Reclass(raster as IGeoDataset, redTable, "FromField",
                "ToField", "OutField", true);
            IGeoDataset blue = reclassOp.Reclass(raster as IGeoDataset, redTable, "FromField",
                "ToField", "OutField", true);

            IRasterBandCollection rasterBandCollection;
            IRaster newRaster = new RasterClass();
            rasterBandCollection = newRaster as IRasterBandCollection;

            IRasterBandCollection tempRasterBandCollection;
            IRasterBand tempRasterBand;

            tempRasterBandCollection = red as IRasterBandCollection;
            tempRasterBand = tempRasterBandCollection.Item(0);
            rasterBandCollection.AppendBand(tempRasterBand);
            
            tempRasterBandCollection = green as IRasterBandCollection;
            tempRasterBand = tempRasterBandCollection.Item(0);
            rasterBandCollection.AppendBand(tempRasterBand);

            tempRasterBandCollection = blue as IRasterBandCollection;
            tempRasterBand = tempRasterBandCollection.Item(0);
            rasterBandCollection.AppendBand(tempRasterBand);

            return newRaster;
        }

　　保存的时候一定要注意，保存成TIFF格式，保存成GRID格式，会报错Stack name *** is too long，是GRID不支持多波段吧

            ISaveAs2 save = MyRasterTools.toColor(raster, rTable, gTable, bTable) as  ISaveAs2;
            IDataset outRasterDS = save.SaveAs("multibands.tif", rasterWorkspace as IWorkspace, "TIFF");
            System.Runtime.InteropServices.Marshal.ReleaseComObject(outRasterDS);

　　最后一句释放保存的结果，要不然之后从Workspace打开，会报错