C#+AE 用MapControl加载栅格格式文件

需要引入DataSourceRaster命名空间。

具体步骤如下:

①:利用工作控件工厂抽象类定义接口变量,利用工作空间工厂的子类RatserWorkspaceFactory对应的组件类RasterWorkspaceFactoryClass实例化该接口变量。

②:定义并实例化工作空间变量,定义并实例化栅格工作空间变量;

③:定义栅格数据集,并利用所选栅格数据文件进行实例化,判断该文件是否具有金字塔,若没有,则创建金字塔,以提高大数据量图像的显示效率;

④:定义栅格数据,栅格数据层和数据层,并向MapControl控件中添加数据层数据。

具体代码如下:

System.Windows.Forms.OpenFileDialog ofd = new OpenFileDialog();
ofd.Filter = "*.bmp|*.bmp|*.jpg|*.jpg|*.tif|*.tif";
ofd.ShowDialog();

string filePath = ofd.FileName;

//此两个路径和文件名作为参数:
string pathName = System.IO.Path.GetDirectoryName(filePath);
string fileName = System.IO.Path.GetFileName(filePath);

//定义工作空间工厂并实例化:
IWorkspaceFactory pWSF;
pWSF = new RasterWorkspaceFactoryClass();

IWorkspace pWS;
pWS = pWSF.OpenFromFile(pathName,0);

IRasterWorkspace pRWS;
pRWS = pWS as IRasterWorkspace;

IRasterDataset pRasterDataset;
pRasterDataset = pRWS.OpenRasterDataset(fileName);

//影像金字塔的判断与创建
IRasterPyramid pRasPyrmid;
pRasPyrmid = pRasterDataset as IRasterPyramid;

if(pRasPyrmid!=null)
{
    if(!(pRasPyrmid.Present))
    {
        pRasPyrmid.Create();
    }
}

IRaster pRaster;
pRaster = pRasterDataset.CreateDefaultRaster();

IRasterLayer pRasterLayer;
pRasterLayer = new RasterLayerClass();
pRasterLayer.CreateFromRaster(pRaster);

ILayer pLayer = pRasterLayer as ILayer;
axMapControl1.AddLayer(pLayer,0);

 

posted @ 2016-09-24 11:41  wenglabs  阅读(1184)  评论(0编辑  收藏  举报