C#平面坐标与经纬度转换

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一般空间参考ISpatialReferencemSpa；一般可从AE控件axMapControl得到

 

ESRI.ArcGIS.Controls.AxMapControlaxMapControl;

mSpa= axMapControl. SpatialReference;

投影坐标系为

mGeographic =(int)esriSRGeoCSType.esriSRGeoCS_WGS1984;

mProject= (int)esriSRProjCSType.esriSRProjCS_Beijing1954GK_23N;

经纬度点转换为平面坐标：

public static IPoint GetProject(double x, double y) { ISpatialReferenceFactory2 sprf = new SpatialReferenceEnvironmentClass(); IPoint pt = new PointClass(); pt.PutCoords(x, y); IGeometry geo = (IGeometry)pt; IGeographicCoordinateSystem pGeoSys = sprf.CreateGeographicCoordinateSystem(mGeographic); geo.SpatialReference = pGeoSys; //创建你希望投影到的平面坐标系统 IProjectedCoordinateSystem pProSys = sprf.CreateProjectedCoordinateSystem(mSpa.FactoryCode); geo.Project(pProSys); return pt; }

 

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平面坐标转换为经纬度 :

public static IPoint GetGeo(double x, double y) { ISpatialReferenceFactory2 sprf= new SpatialReferenceEnvironmentClass(); IPoint pt=new PointClass(); pt.PutCoords(x,y); IGeometry geo = (IGeometry)pt; if(null==mSpa) { IProjectedCoordinateSystem pProSys = sprf.CreateProjectedCoordinateSystem(mProject); geo.SpatialReference = pProSys; } else { geo.SpatialReference = mSpa; } IGeographicCoordinateSystem pGeoSys =sprf.CreateGeographicCoordinateSystem(mGeographic); geo.Project(pGeoSys); return pt; }

 

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Ps ： FactoryCode 是把空间参考转换为相应的数值。默认为 0