ArcEngine下投影坐标和经纬度坐标的相互转换

jojojojo2002 原文 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;
}
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