不同gdb，相同数据集合并

众所周知，数据处理是GIS中一项重要且繁琐的工作，处理数据的工具和方法也太多了，在做数据处理的时候，经常会遇到这样的问题：对存储在不同gdb中、并且数据集名称相同的数据进行合并处理：

如图：数据组织如下，每个gdb中都存储了一些列FeatureClass，（但gdb中的FeatureClass数量并不相同）

思路是：

1.先对每个gdb中的数据进行处理，使得每个gdb中的featureclass数量和名称相同。由于对Engine比较熟悉，这里我是用Engine进行处理的，具体代码如下：

private function Execute(){  //初始执行函数：
     string templatePath = @"F:\testout";
     DirectoryInfo directoryInfo = new DirectoryInfo(templatePath);
     DirectoryInfo[] dirInfo = directoryInfo.GetDirectories();
     string yy = dirInfo[].Name;
     string FeatureClassName = "ROALK_arc";  //FeatureClass名称，这里可以设置一个数组，存储所有的FeatureClass
     for (int i = ; i < dirInfo.Length; i++)
     {
         string gdbName = dirInfo[i].Name;
         //打开filegdb
         bool value = oper(@"F:\testout\" + gdbName, FeatureClassName);//判断FeatureClass是否存在
         string path = @"F:\testout\" + gdbName;
         if (value == false)
         {
             copyFeatureClass(path, FeatureClassName);
          }

    }
}

public bool oper(string filename,string featureClassName) //判断FeatureClass是否存在

        {

            IWorkspace2 workspace = null;
            IWorkspaceFactory2 workspaceFactory = new FileGDBWorkspaceFactoryClass();
            workspace = workspaceFactory.OpenFromFile(filename, ) as IWorkspace2;

            IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;

            bool flag = workspace.get_NameExists(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTFeatureClass, featureClassName);

            return flag;

        }

public bool oper(string filename,string featureClassName) //判断是gdb中是否存在某个FeatureClass

        {

            IWorkspace2 workspace = null;
            IWorkspaceFactory2 workspaceFactory = new FileGDBWorkspaceFactoryClass();
            workspace = workspaceFactory.OpenFromFile(filename, ) as IWorkspace2;

            IFeatureWorkspace featureWorkspace = workspace as IFeatureWorkspace;

            bool flag = workspace.get_NameExists(ESRI.ArcGIS.Geodatabase.esriDatasetType.esriDTFeatureClass, featureClassName);

            return flag;

        }

//拷贝所有的FeatureClass到gdb，并删除里面的数据，保证每个featureclass为空，注:D：\Data\Shapefiles存储了所有的要合并的FeatureClass的空图层，便于拷贝。

 private void convert()
        {
                 IWorkspaceName sourceWorkspaceName = new WorkspaceNameClass
                 {
                     WorkspaceFactoryProgID = "esriDataSourcesFile.ShapefileWorkspaceFactory",
                     PathName = @"D:\Data\Shapefiles"
                 };
                 IName sourceWorkspaceIName = (IName)sourceWorkspaceName;
                 IWorkspace sourceWorkspace = (IWorkspace)sourceWorkspaceIName.Open();

                 // Create a name object for the target (file GDB) workspace and open it.
                 IWorkspaceName targetWorkspaceName = new WorkspaceNameClass
                 {
                     WorkspaceFactoryProgID = "esriDataSourcesGDB.FileGDBWorkspaceFactory",
                     PathName = @"D:\Data\Public.gdb"
                 };
                 IName targetWorkspaceIName = (IName)targetWorkspaceName;
                 IWorkspace targetWorkspace = (IWorkspace)targetWorkspaceIName.Open();

                 // Create a name object for the source dataset.
                 IFeatureClassName sourceFeatureClassName = new FeatureClassNameClass();
                 IDatasetName sourceDatasetName = (IDatasetName)sourceFeatureClassName;
                 sourceDatasetName.Name = "BOUNT_arc";
                 sourceDatasetName.WorkspaceName = sourceWorkspaceName;

                 // Create a name object for the target dataset.
                 IFeatureClassName targetFeatureClassName = new FeatureClassNameClass();
                 IDatasetName targetDatasetName = (IDatasetName)targetFeatureClassName;
                 targetDatasetName.Name = "BOUNT_arc";
                 targetDatasetName.WorkspaceName = targetWorkspaceName;

                 // Open source feature class to get field definitions.
                 IName sourceName = (IName)sourceFeatureClassName;
                 IFeatureClass sourceFeatureClass = (IFeatureClass)sourceName.Open();

                 // Create the objects and references necessary for field validation.
                 IFieldChecker fieldChecker = new FieldCheckerClass();
                 IFields sourceFields = sourceFeatureClass.Fields;
                 IFields targetFields = null;
                 IEnumFieldError enumFieldError = null;

                 // Set the required properties for the IFieldChecker interface.
                 fieldChecker.InputWorkspace = sourceWorkspace;
                 fieldChecker.ValidateWorkspace = targetWorkspace;

                 // Validate the fields and check for errors.
                 fieldChecker.Validate(sourceFields, out enumFieldError, out targetFields);
                 if (enumFieldError != null)
                 {
                     // Handle the errors in a way appropriate to your application.
                     MessageBox.Show("Errors were encountered during field validation.");
                 }    // Find the shape field.

                 String shapeFieldName = sourceFeatureClass.ShapeFieldName;
                 int shapeFieldIndex = sourceFeatureClass.FindField(shapeFieldName);
                 IField shapeField = sourceFields.get_Field(shapeFieldIndex);

                 // Get the geometry definition from the shape field and clone it.
                 IGeometryDef geometryDef = shapeField.GeometryDef;
                 IClone geometryDefClone = (IClone)geometryDef;
                 IClone targetGeometryDefClone = geometryDefClone.Clone();
                 IGeometryDef targetGeometryDef = (IGeometryDef)targetGeometryDefClone;

                 // Cast the IGeometryDef to the IGeometryDefEdit interface.
                 IGeometryDefEdit targetGeometryDefEdit = (IGeometryDefEdit)targetGeometryDef;
                 // Set the IGeometryDefEdit properties.
                 targetGeometryDefEdit.GridCount_2 = ;
                 targetGeometryDefEdit.set_GridSize(, 0.75);

                 IFeatureDataConverter featureDataConverter = new FeatureDataConverterClass();
                 IEnumInvalidObject enumInvalidObject = featureDataConverter.ConvertFeatureClass
                     (sourceFeatureClassName, null, null, targetFeatureClassName,
                     targetGeometryDef, targetFields, "", , );    // Check for errors.
                 IInvalidObjectInfo invalidObjectInfo = null; enumInvalidObject.Reset();

        }

2.合并，在ArcGIS中采用Python:

可以参考http://blog.csdn.net/esrichinacd/article/details/14146653

最后需要注意的地方是：在10.2的ArcMap中执行时会如下错误

我也是检查了好长时间，原因是10.2的ArcMap中执行结果会自动添加到ArcMap中，即使右键取消“添加至结果”也不行。（导致了第二次循环的时候合并的数据是结果集相同的数据的合并，所以会报上面错误）

所以这里，我们执行的时候可以到ArcCatalog中执行python脚本：