AE中的坐标系统转换

AE 中的坐标系统转换中的坐标系统转换 ArcEngine 开发总结 2008 09 04 22 47 33 阅读 405 评论 0 字号 大中小 在搞 AE 开发的时候 经常碰到的一个问题就是不同坐标系统之间的转换 AE 中 IGlobeControl 控 件中提供了 IGlobeViewUtil 类实现了大地坐标 屏幕坐标和地理坐标三者之间的转换 IMapControl 中则 提供了 ToMapPoint 和 FromMapPoint 两种方法实现屏幕坐标和地理坐标之间的转换 但在实际开发中 这些转换还不够 比如当我们需要实现地理坐标转换到自定义格式的大地坐标时 上述方法则不能解决这 些问题 最好的解决方法是使用 IGeometry 对象的 Project 方法 实现不同空间参照系之间的相互转换 以下以地理坐标转为自定义的 Albers 坐标系统为例予以说明 其主要用到的接口有 ISpatialReferenceFactory IProjectedCoordinateSystem IProjectedCoordinateSystemEdit ISpatialRe ferenceFactory IGeographicCoordinateSystem ISpatialReference 等 其 C 代码如下 将任意坐标系统转换为自定义 Albers 大地坐标 米 public static IPoint GeoToGra IPoint point IPoint pt new PointClass pt PutCoords point X point Y ISpatialReferenceFactory2 pFact new SpatialReferenceEnvironmentClass 定义地理坐标 由输入的对象决定 也可以自己定义 参考 esriSRGeoCSType IGeographicCoordinateSystem pGCS new GeographicCoordinateSystemClass pGCS pFact CreateGeographicCoordinateSystem point SpatialReference FactoryCode 自定义投影方式 IProjectedCoordinateSystem pProjectedCS new ProjectedCoordinateSystemClass IProjectedCoordinateSystemEdit pProjectedCSEdit pProjectedCS as IProjectedCoordinateSystemEdit 定义投影方式 参考 esriSRProjectionType IProjection pProjection new ProjectionClass pProjection pFact CreateProjection int esriSRProjectionType esriSRProjection Albers 定义投影单位 参考 esriSRUnitType ILinearUnit pUnit new LinearUnitClass pUnit pFact CreateUnit int esriSRUnitType esriSRUnit Meter as ILinearUnit 定义其他参数 参考 esriSRParameterType IParameter pParm new IParameter 6 pParm 0 pFact CreateParameter int esriSRParameterType esriSRParameter FalseEasting pParm 0 Value 0 pParm 1 pFact CreateParameter int esriSRParameterType esriSRParameter FalseNorthing pParm 1 Value 0 pParm 2 pFact CreateParameter int esriSRParameterType esriSRParameter CentralMeridian pParm 2 Value 110 pParm 3 pFact CreateParameter int esriSRParameterType esriSRParameter StandardParallel1 pParm 3 Value 25 pParm 4 pFact CreateParameter int esriSRParameterType esriSRParameter StandardParallel2 pParm 4 Value 47 pParm 5 pFact CreateParameter int esriSRParameterType esriSRParameter LatitudeOfOrigin pParm 5 Value 0 设置投影相关信息 object name User Defined Albers object alias Albers object abbreviation Albers object remarks User Defined Albers is the projection object usage object gcs pGCS object projectedUnit pUnit object projection pProjection object parameters pParm pProjectedCSEdit Define ref name ref alias ref abbreviation ref remarks ref usage ref gcs ref projectedUnit ref projection ref parameters 获取自定义空间参考 ISpatialReference pSpatialRef pProjectedCS as ISpatialReference IGeometry pGeometry IGeometry pt pGeometry SpatialReference pGCS as ISpatialReference 重投影处理 pGeometry Project pSpatialRef return pt 将平面坐标转换为地理坐标 WGS1984 经纬度 public static IPoint GetGeo IGeometry pg IPoint pt new PointClass pt PutCoords pg Envelope XMax pg Envelope YMax 这里 IGeometry 对象可换成 IPoint 等 对象 ISpatialReferenceFactory2 spatialReferenceFact new SpatialReferenceEnvironmentClass IGeometry geo IGeometry pt geo SpatialReference spatialReferenceFact CreateProjectedCoordinateSystem pg SpatialReference FactoryCode ISpatialReference pSR spatialReferenceFact CreateGeographicCoordinateSystem int esriSRGeoCSType esriSRGeoCS WG S1984 geo Project pSR return pt 以上实现可以参考 ESRI 提供的相关帮助示例文档 IProjectedCoordinateSystemEdit Define Example CreateParameter Example ISpatialReferenceFactory Example CreateProjection Example CreateUnit Example CreateGeographicCoordinateSystem Example CreateProjectedCoordinateSystem Example 自定义不同的坐标系统 需要设置不同的参数 所有的地图投影都必须有 FalseEasting 和 FalseNorthing 两个参数 每种不同投影的其他参数的参数如下所示 具体参照 IProjectedCoordinateSystemEdit Interface Aitoff CentralMeridian Albers CentralMeridian StandardParallel1 StandardParallel2 LatitudeOfOrigin Azimuthal Equidistant CentralMeridian LatitudeOfOrigin Behrmann CentralMeridian Bonne CentralMeridian StandardParallel1 Cassini CentralMeridian ScaleFactor LatitudeOfOrigin Craster Parabolic CentralMeridian Cylindrical Equal Area CentralMeridian StandardParallel1 Double Stereographic CentralMeridian ScaleFactor LatitudeOfOrigin Eckert I CentralMeridian Eckert II CentralMeridian Eckert III CentralMeridian Eckert IV CentralMeridian Eckert V CentralMeridian Eckert VI CentralMeridian Equidistant Conic CentralMeridian StandardParallel1 StandardParallel2 LatitudeOfOrigin Equidistant Cylindrical CentralMeridian StandardParallel1 Flat Polar Quartic CentralMeridian Gall Stereographic CentralMeridian Gauss Kruger CentralMeridian ScaleFactor LatitudeOfOrigin Gnomonic LongitudeOfCenter LatitudeOfCenter Hammer Aitoff CentralMeridian Hotine Oblique Mercator Azimuth Center ScaleFactor Azimuth LongitudeOfCenter LatitudeOfCenter Hotine Oblique Mercator Azimuth Natural Origin ScaleFactor Azimuth LongitudeOfCenter LatitudeOfCenter Hotine Oblique Mercator Two Point Center LatitudeOf1st LatitudeOf2nd ScaleFactor LongitudeOf1st LongitudeOf2nd LatitudeOfCenter Hotine Oblique Mercator Two Point Natural Origin LatitudeOf1st LatitudeOf2nd ScaleFactor LongitudeOf1st LongitudeOf2nd LatitudeOfCenter Krovak PseudoStandardParallel1 ScaleFactor Azimuth LongitudeOfCenter LatitudeOfCenter XScaleFactor YScaleFactor Rotation Lambert Azimuthal Equal Area CentralMeridian LatitudeOfOrigin Lambert Conformal Conic CentralMeridian StandardParallel1 StandardParallel2 ScaleFactor LatitudeOfOrigin Local ScaleFactor Azimuth LongitudeOfCenter LatitudeOfCenter Loximuthal CentralMeridian CentralParallel Mercator CentralMeridian StandardParallel1 Miller Cylindrical CentralMeridian Mollweide CentralMeridian New Zealand Map Grid LongitudeOfOrigin LatitudeOfOrigin Orthographic LongitudeOfCenter LatitudeOfCenter Plate Carree CentralMeridian Polyconic CentralMeridian LatitudeOfOrigin Quartic Authalic CentralMeridian Rectified Skew Orthomorphic Center ScaleFactor Azimuth LongitudeOfCenter LatitudeOfCenter Rotation Rectified Skew Orthomorphic Natural Origin ScaleFactor Azimuth LongitudeOfCenter LatitudeOfCenter Rotation Robinson CentralMeridian Robinson ARC INFO CentralMeridian Sinusoidal 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