基于C#的AE二次开发之影像数据的裁切（掩膜）

基于C#的AE二次开发之影像数据的裁切（掩膜）

我的开发环境为ArcGIS Engine 10.2与Visual studio2010，主地图名称为axMapControl1，如果变动则需要修改（注意相关事件的添加与动态链接库的引入）。

• 效果预览

裁剪前

裁剪后

实现代码

• 引用类库

using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.ADF;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.GeoAnalyst;
using ESRI.ArcGIS.Geodatabase;
using ESRI.ArcGIS.DataSourcesRaster;
using ESRI.ArcGIS.DataSourcesGDB;
using ESRI.ArcGIS.SpatialAnalyst;
using ESRI.ArcGIS.Geometry;

• 代码实现

private void 影像裁剪ToolStripMenuItem_Click(object sender, EventArgs e)
{if (axMapControl1.get_Layer(0) is IFeatureLayer && axMapControl1.get_Layer(1) is IRasterLayer){IFeatureLayer pFeatureLayer = axMapControl1.get_Layer(0) as IFeatureLayer;//输入裁剪矢量图层IRasterLayer pRasterLayer = axMapControl1.get_Layer(1) as IRasterLayer;//输入裁剪栅格图层IPolygon pPoly = pFeatureLayer.FeatureClass.GetFeature(0).Shape as IPolygon;//设置裁剪要素rasterClip(pRasterLayer, pPoly, "rasterClip0");//调用裁剪方法//强提醒，完成裁剪MessageBox.Show("裁剪完成！");}
}/// <summary>
/// 掩膜处理
/// </summary>
/// <param name="pRasterLayer">输入裁剪栅格图层</param>
/// <param name="clipGeo">输入裁剪矢量要素</param>
/// <param name="FileName">输出文件名称</param>
public void rasterClip(IRasterLayer pRasterLayer, IPolygon clipGeo, string FileName)
{IRaster pRaster = pRasterLayer.Raster;//获取栅格文件IRasterProps pProps = pRaster as IRasterProps;object cellSizeProvider = pProps.MeanCellSize().X;IGeoDataset pInputDataset = pRaster as IGeoDataset;IExtractionOp pExtractionOp = new RasterExtractionOp() as IExtractionOp;IRasterAnalysisEnvironment pRasterAnaEnvir = pExtractionOp as IRasterAnalysisEnvironment;pRasterAnaEnvir.SetCellSize(esriRasterEnvSettingEnum.esriRasterEnvValue, ref cellSizeProvider);object extentProvider = clipGeo.Envelope;//获取矢量图形范围object snapRasterData = Type.Missing;pRasterAnaEnvir.SetExtent(esriRasterEnvSettingEnum.esriRasterEnvValue, ref extentProvider, ref snapRasterData);IGeoDataset pOutputDataset = pExtractionOp.Polygon(pInputDataset, clipGeo as IPolygon, true);IRaster clipRaster;  //裁切后得到的IRasterif (pOutputDataset is IRasterLayer){IRasterLayer rasterLayer = pOutputDataset as IRasterLayer;clipRaster = rasterLayer.Raster;}else if (pOutputDataset is IRasterDataset){IRasterDataset rasterDataset = pOutputDataset as IRasterDataset;clipRaster = rasterDataset.CreateDefaultRaster();}else if (pOutputDataset is IRaster){clipRaster = pOutputDataset as IRaster;}else{return;}//保存裁切后得到的clipRaster,直接保存为tif影像文件IWorkspaceFactory pWKSF = new RasterWorkspaceFactory();//保存裁剪后的影像到本地路径下string filepath = @"c:\dat\";//判断文件夹是否存在，如果不存在新建文件夹if (false == System.IO.Directory.Exists(filepath)){//创建文件夹Directory.CreateDirectory(filepath);}IWorkspace pWorkspace = pWKSF.OpenFromFile(filepath, 0);ISaveAs pSaveAs = clipRaster as ISaveAs;//输出要素类的名称，文件后缀可以设置pSaveAs.SaveAs(FileName+".tif", pWorkspace, "TIFF");
}

• 导出图像格式