ArcEngine下投影坐标和经纬度坐标的相互转换

来源：互联网发布：程序员电脑壁纸高清编辑：程序博客网时间：2024/04/29 20:24

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;
}