![IPoint从自定义的投影坐标系转换到自定义的地理坐标系 IPoint从自定义的投影坐标系转换到自定义的地理坐标系](https://image.shishitao.com:8440/aHR0cHM6Ly9ia3FzaW1nLmlrYWZhbi5jb20vdXBsb2FkL2NoYXRncHQtcy5wbmc%2FIQ%3D%3D.png?!?w=700&webp=1)
IPoint pointStart = new PointClass();
pointStart = xyPolyline.FromPoint; ISpatialReferenceFactory pSpatialRefFtry = new SpatialReferenceEnvironmentClass();
ISpatialReference fromSpatialRef = pSpatialRefFtry.CreateESRISpatialReferenceFromPRJFile(Application.StartupPath + "\\CoordinateSystems\\2000_3_Degree_117E.prj");
ISpatialReference toSpatialRef = pSpatialRefFtry.CreateESRISpatialReferenceFromPRJFile(Application.StartupPath + "\\CoordinateSystems\\China Geodetic Coordinate System 2000.prj");
ISpatialReferenceFactory pSRF = new SpatialReferenceEnvironmentClass();
pointStart.SpatialReference = fromSpatialRef;
pointStart.Project(toSpatialRef);