ArcGIS Engine中空间参照(地理坐标)相关方法总结

1.创建空间参考

/// <summary>  
/// 根据prj文件创建空间参考  
/// </summary>  
/// <param name="strProFile">空间参照文件</param>  
/// <returns></returns>  
public static ISpatialReference CreateSpatialReference(string strProFile)  
{  
    ISpatialReferenceFactory pSpatialReferenceFactory = new SpatialReferenceEnvironmentClass();  
    ISpatialReference pSpatialReference = pSpatialReferenceFactory.CreateESRISpatialReferenceFromPRJFile(strProFile);  
    return pSpatialReference;             
}  


/// <summary>  
/// 创建地理坐标系  
/// </summary>  
/// <param name="gcType">esriSRProjCS4Type</param>  
/// <returns></returns>  
public static ISpatialReference CreateGeographicCoordinate(esriSRProjCS4Type gcsType)  
{  
    ISpatialReferenceFactory pSpatialReferenceFactory = new SpatialReferenceEnvironmentClass();  
    ISpatialReference pSpatialReference = pSpatialReferenceFactory.CreateGeographicCoordinateSystem((int)gcsType);  
    return pSpatialReference;  
}  


/// <summary>  
/// 创建投影坐标系  
/// </summary>  
/// <param name="pcType">esriSRProjCS4Type</param>  
/// <returns></returns>  
public static ISpatialReference CreateProjectedCoordinate(esriSRProjCS4Type pcsType)  
{  
    ISpatialReferenceFactory2 pSpatialReferenceFactory = new SpatialReferenceEnvironmentClass();  
    ISpatialReference pSpatialReference = pSpatialReferenceFactory.CreateProjectedCoordinateSystem((int)pcsType);  
    return pSpatialReference;  
}  


/// <summary>  
/// 获取空投影  
/// </summary>  
/// <returns></returns>  
public static ISpatialReference CreateUnKnownSpatialReference()  
{  
    ISpatialReference pSpatialReference = new UnknownCoordinateSystemClass();  
    pSpatialReference.SetDomain(0, 99999999, 0, 99999999);//设置空间范围  
    return pSpatialReference;  
}  

2.获取空间参考

/// <summary>  
/// 获取要素集空间参考  
/// </summary>  
/// <param name="pFeatureDataset">要素集</param>  
/// <returns></returns>  
public static ISpatialReference GetSpatialReference(IFeatureDataset pFeatureDataset)  
{  
    IGeoDataset pGeoDataset = pFeatureDataset as IGeoDataset;  
    ISpatialReference pSpatialReference = pGeoDataset.SpatialReference;  
    return pSpatialReference;             
}  


/// <summary>  
/// 获取要素层空间参考  
/// </summary>  
/// <param name="pFeatureLayer">要素层</param>  
/// <returns></returns>  
public static ISpatialReference GetSpatialReferenc(IFeatureLayer pFeatureLayer)  
{IFeatureClass pFeatureClass = pFeatureLayer.FeatureClass;  
    IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;  
    ISpatialReference pSpatialReference = pGeoDataset.SpatialReference;  
    return pSpatialReference;             
}  


/// <summary>  
/// 获取要素类空间参考  
/// </summary>  
/// <param name="pFeatureClass">要素类</param>  
/// <returns></returns>  
public static ISpatialReference GetSpatialReference(IFeatureClass pFeatureClass)  
{  
    IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;  
    ISpatialReference pSpatialReference = pGeoDataset.SpatialReference;  
    return pSpatialReference;             
}  

3.修改空间参考

/// <summary>  
/// 修改要素集空间参考  
/// </summary>  
/// <param name="pFeatureDataset">要素集</param>  
/// <param name="pSpatialReference">新空间参考</param>  
public static void AlterSpatialReference(IFeatureDataset pFeatureDataset, ISpatialReference pSpatialReference)  
{  
    IGeoDataset pGeoDataset = pFeatureDataset as IGeoDataset;  
    IGeoDatasetSchemaEdit pGeoDatasetSchemaEdit = pGeoDataset as IGeoDatasetSchemaEdit;  
    if (pGeoDatasetSchemaEdit.CanAlterSpatialReference == true)  
        pGeoDatasetSchemaEdit.AlterSpatialReference(pSpatialReference);  
}  


/// <summary>  
/// 修改要素类空间参考  
/// </summary>  
/// <param name="pFeatureClass">要素类</param>  
/// <param name="pSpatialReference">新空间参考</param>  
public static void AlterSpatialReference(IFeatureClass pFeatureClass, ISpatialReference pSpatialReference)  
{  
    IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;  
    IGeoDatasetSchemaEdit pGeoDatasetSchemaEdit = pGeoDataset as IGeoDatasetSchemaEdit;  
    if (pGeoDatasetSchemaEdit.CanAlterSpatialReference == true)  
        pGeoDatasetSchemaEdit.AlterSpatialReference(pSpatialReference);  
}