ArcEngine 读取栅格图层中像素块的光谱波段值

客户要求从TIFF图像中提取光谱波段值，画光谱曲线。自己也是刚学AE，搞了半天才提取到光谱波段值。添加注释分享一下。

private void axMapControl_OnMouseDown(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e)
        {
            if (e.button == 2)
            {
                //栅格图层
                var rasterLayer = this.axMapControl.get_Layer(0) as IRasterLayer;
                //栅格图层光谱波段集合
                var rasterBandCollection = rasterLayer.Raster as IRasterBandCollection;
                //读取栅格图层的属性
                var rasterProps = rasterLayer.Raster as IRasterProps;
                //像素点X方向的大小（图层含有地理坐标）
                double pixelXsize = (rasterProps.Extent.XMax - rasterProps.Extent.XMin) / rasterProps.Width;
                //像素点Y方向的大小（图层含有地理坐标）
                double pixelYsize = (rasterProps.Extent.YMax - rasterProps.Extent.YMin) / rasterProps.Height;
                //栅格图层的位置（以像素为单位）
                var pnt = new PntClass() { X = (e.mapX - rasterProps.Extent.XMin) / pixelXsize, Y = (rasterProps.Extent.YMax - e.mapY) / pixelYsize };
                //定义像素块大小
                IPixelBlock pixelBlock = rasterLayer.Raster.CreatePixelBlock(new PntClass() { X = 1, Y = 1 });
                //将栅格图层中指定位置的像素信息读入像素块中
                rasterLayer.Raster.Read(pnt,pixelBlock);
                StringBuilder sb = new StringBuilder();
                //遍历所有波段
                for (int i = 0; i < rasterBandCollection.Count; i++)
                {
                    //获取像素块中的值
                    sb.AppendFormat("{0}:{1};", rasterBandCollection.Item(i).Bandname, pixelBlock.GetVal(i, 0, 0));
                }
                this.Text = sb.ToString();
            }
        }

https://www.cnblogs.com/sunqin/archive/2012/12/11/2813378.html