/// <summary>/// rectangle/envelop 裁剪线/// </summary>/// <param name="pPolyLine"></param>/// <param name="pEnvelop"></param>/// <returns></returns>public static IPolyline GetClippedPolyline(IPolyline pPolyLine,IEnvelope pEnvelop){ISpatialReferenceFactory spatialReferenceFactory = new SpatialReferenceEnvironmentClass();IGeographicCoordinateSystem gcsSys = spatialReferenceFactory.CreateGeographicCoordinateSystem((int)esriSRGeoCS3Type.esriSRGeoCS_Xian1980);pPolyLine.SpatialReference = gcsSys;pEnvelop.SpatialReference = gcsSys;ITopologicalOperator2 pTopOper = pPolyLine as ITopologicalOperator2;IGeometry pGeoafter=new PolylineClass();pTopOper.QueryClipped(pEnvelop, pGeoafter);return pGeoafter as IPolyline;}

     /// <summary>/// 获取多边形和矿层表面的  相交多边形/// </summary>/// <param name="pPolygon">传入的多边形</param>/// <param name="pTinsurface">矿层表面</param>/// <returns></returns>public static IPolygon GetIntersectedRegion(IPolygon pPolygon,ITinSurface pTinsurface){/*进行Clip和Intersect分析之前,featrue必须设置空间参考,否则出现*System.Runtime.InteropServices.COMException*/ISpatialReferenceFactory pSpaRefFactory = new SpatialReferenceEnvironmentClass();IProjectedCoordinateSystem pcsSys = pSpaRefFactory.CreateProjectedCoordinateSystem((int)esriSRProjCS4Type.esriSRProjCS_Xian1980_3_Degree_GK_Zone_39);IPolygon resultPolygon = new PolygonClass();ITopologicalOperator pTopoOper = pPolygon as ITopologicalOperator;IPolygon pTinPolygon = GetProjectedPolygonFromTin(pTinsurface);pPolygon.SpatialReference = pcsSys;pTinPolygon.SpatialReference = pcsSys;IGeometry otherGeometry = pTinPolygon as IGeometry;resultPolygon =pTopoOper.Intersect(otherGeometry, esriGeometryDimension.esriGeometry1Dimension) as IPolygon;return resultPolygon;}