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  • Engine中如何进行七参数投影转换?

    来自:http://zhihu.esrichina.com.cn/?/question/6858

    解决办法】:
    首先创建自定义geotransformation,然后用IGeometry.ProjectEx进行投影转换。参考代码(以wgs1984转到Xian80为例):

    private void func1ToolStripMenuItem_Click(object sender, EventArgs e) 
    { 
    Type t = Type.GetTypeFromProgID(esriGeometry.SpatialReferenceEnvironment); 
    System.Object obj = Activator.CreateInstance(t); 
    ISpatialReferenceFactory srFact = obj as ISpatialReferenceFactory; 
    IGeographicCoordinateSystem wgs84GCS = srFact.CreateGeographicCoordinateSystem((int)esriSRGeoCSType.esriSRGeoCS_WGS1984); 
    IProjectedCoordinateSystem xian80PCS = srFact.CreateProjectedCoordinateSystem((int)esriSRProjCS4Type.esriSRProjCS_Xian1980_3_Degree_GK_CM_102E); 
    
    IGeoTransformation geoTrans = CreateGeoTransformation((ISpatialReference)wgs84GCS, (ISpatialReference)xian80PCS); 
    
    IWorkspaceFactory wksfac = new FileGDBWorkspaceFactoryClass(); 
    IFeatureWorkspace feawks = wksfac.OpenFromFile(@E:TEST.gdb,0) as IFeatureWorkspace; 
    IFeatureClass fc = feawks.OpenFeatureClass(POINT); 
    IFeature fea = fc.Search(null, false).NextFeature(); 
    IGeometry5 geometry; 
    IPoint point = fea.ShapeCopy as IPoint; 
    geometry = point as IGeometry5; 
    geometry.SpatialReference = wgs84GCS; 
    
    geometry.ProjectEx(xian80PCS, esriTransformDirection.esriTransformForward, geoTrans, false, 0.0, 0.0); 
    point = geometry as IPoint; 
    MessageBox.Show(point.X.ToString(),point.Y.ToString()); 
    } 
    
    private IGeoTransformation CreateGeoTransformation(ISpatialReference pInputSR, ISpatialReference pOutputSR) 
    { 
    IGeoTransformation pGeoTrans; 
    pGeoTrans = new CoordinateFrameTransformationClass(); 
    
    ((ICoordinateFrameTransformation)pGeoTrans).PutSpatialReferences(pInputSR, pOutputSR); 
    ((ICoordinateFrameTransformation)pGeoTrans).PutParameters(p1, p2, p3, p4, p5, p6, p7); 
    
    return pGeoTrans; 
    }
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  • 原文地址:https://www.cnblogs.com/gisoracle/p/5210047.html
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