ArcEngine下投影坐标和经纬度坐标的相互转换

投影转经纬度

private IPoint PRJtoGCS( double x, double y)
{
    IPoint pPoint = 
new PointClass();
    pPoint.PutCoords(x, y);
    ISpatialReferenceFactory pSRF = 
new SpatialReferenceEnvironmentClass();
    pPoint.SpatialReference = pSRF.CreateProjectedCoordinateSystem(
 2414 );
pPoint.Project(pSRF.CreateGeographicCoordinateSystem((
 int )esriSRGeoCSType.esriSRGeoCS_Beijing1954));
    
return pPoint;
}

 

其中,pPoint.SpatialReference = pSRF.CreateProjectedCoordinateSystem( 2414 );

这行代码是设置pPoint 的空间参考,也就是要转化的点的投影坐标。如果不知道投影坐标的话,转化会报异常。

2414 为该投影的enum 值

pPoint.Project(pSRF.CreateGeographicCoordinateSystem(( int )esriSRGeoCSType.esriSRGeoCS_Beijing1954));
将该点的投影坐标转化为经纬度。

 

经纬度到投影:

private IPoint GCStoPRJ(IPoint pPoint, int GCSType, int PRJType)
{
    ISpatialReferenceFactory pSRF = 
new SpatialReferenceEnvironmentClass();
    pPoint.SpatialReference = pSRF.CreateGeographicCoordinateSystem(GCSType);
    pPoint.Project(pSRF.CreateProjectedCoordinateSystem(PRJType));
    
return pPoint;
}

转载自:https://blog.csdn.net/jojojojo2002/article/details/44834521

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