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Geodatabase - 打开栅格数据

2024-07-30 08:09:55   211人阅读

打开栅格数据

　　和打开要素类的方式类似,打开栅格数据集需要用 IRasterWorkspace,如

 1 //获得栅格工作空间(普通目录). 2         public ESRI.ArcGIS.DataSourcesRaster.IRasterWorkspace GetRasterWorkspace(string rasterWorkspacePath) { 3             ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesRaster.RasterWorkspaceFactoryClass();    //使用RasterWorkspaceFactoryClass. 4             ESRI.ArcGIS.Geodatabase.IWorkspace ws = wsf.OpenFromFile(rasterWorkspacePath, 0); 5             ESRI.ArcGIS.DataSourcesRaster.IRasterWorkspace rws = (ESRI.ArcGIS.DataSourcesRaster.IRasterWorkspace)ws; 6             return rws; 7         } 8  9         /// <summary>10         /// 打开栅格数据集(普通目录).11         /// </summary>12         /// <param name="foldName">目录名称(普通目录),如,foldName="G:\doc\gis\1.400\data\raster".</param>13         /// <param name="fileName">栅格数据集的名称,如fileName="srtm_58_09.tif"</param>14         /// <returns></returns>15         public ESRI.ArcGIS.Geodatabase.IRasterDataset OpenRasterDataset(string foldName, string fileName) {16             ESRI.ArcGIS.DataSourcesRaster.IRasterWorkspace rws = GetRasterWorkspace(foldName);17             return rws.OpenRasterDataset(fileName);18         }19 20         //获得栅格工作空间(数据库中).21         //如rasterWorkspaceExPath="G:\doc\gis\1.400\data\pdb.mdb"22         public ESRI.ArcGIS.Geodatabase.IRasterWorkspaceEx GetRasterWorkspaceEx(string rasterWorkspaceExPath) {23             ESRI.ArcGIS.Geodatabase.IWorkspaceFactory wsf = new ESRI.ArcGIS.DataSourcesGDB.AccessWorkspaceFactoryClass();   //使用专门数据库.24             ESRI.ArcGIS.Geodatabase.IWorkspace ws = wsf.OpenFromFile(rasterWorkspaceExPath, 0);25             ESRI.ArcGIS.Geodatabase.IRasterWorkspaceEx rwsEx = (ESRI.ArcGIS.Geodatabase.IRasterWorkspaceEx)ws;26             return rwsEx;27         }28 29         /// <summary>30         /// 打开栅格数据集(数据库中)31         /// </summary>32         /// <param name="rasterWorkspaceEx"></param>33         /// <param name="rasterDatasetName">栅格数据集名称,如"rds"</param>34         /// <returns></returns>35         public ESRI.ArcGIS.Geodatabase.IRasterDataset OpenRasterDataset(ESRI.ArcGIS.Geodatabase.IRasterWorkspaceEx rasterWorkspaceEx, string rasterDatasetName) {36             return rasterWorkspaceEx.OpenRasterDataset(rasterDatasetName);37         }

 

需要指出的是,当我们的数据是存储在SDE数据库,FileGeodatabase或PersonalGeodatabase时,要用IRasterWorkspaceEx,而不是IRasterWorkspace.

IRasterWorkspace与IRasterWorkspaceEx的区别

　　　　1)IRasterWorkspace主要是用来读取以文件格式存储在本地的栅格数据.

　　　　2)IRasteWorkspaceEx接口主要是用来读取GeoDatabase中的栅格数据集和栅格目录.

 

打开栅格目录

　　打开栅格目录需要用IRasterWorkspaceEx,可以从以上(打开栅格数据集的第20~27行获取IRasterWorkspaceEx对象,然后通过OpenRasterCatalog获取.如

1 /// <summary>2         /// 打开栅格目录.3         /// </summary>4         /// <param name="rasterWorkspaceEx"></param>5         /// <param name="rasterCatalogName">栅格目录名,如rasterCatalogName="r_catalog"</param>6         /// <returns></returns>7         public ESRI.ArcGIS.Geodatabase.IRasterCatalog OpenRasterCatalog(ESRI.ArcGIS.Geodatabase.IRasterWorkspaceEx rasterWorkspaceEx, string rasterCatalogName) {8             return rasterWorkspaceEx.OpenRasterCatalog(rasterCatalogName);9         }

 打开栅格目录中的数据

1 //打开栅格目录中的数据.2         ESRI.ArcGIS.Geodatabase.IRasterDataset GetRasterCatalogItem(ESRI.ArcGIS.Geodatabase.IRasterCatalog rasterCatalog, int objectId) {3             ESRI.ArcGIS.Geodatabase.IFeatureClass fc = (ESRI.ArcGIS.Geodatabase.IFeatureClass)rasterCatalog;4             ESRI.ArcGIS.Geodatabase.IRasterCatalogItem rCataItem = (ESRI.ArcGIS.Geodatabase.IRasterCatalogItem)fc.GetFeature(objectId);5             return rCataItem.RasterDataset;6         }

 

Geodatabase - 打开栅格数据


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