GIS中复杂多边形的处理(例如孤岛、空心多边形)

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对于ArcGIS中的复杂多边形处理起来有时候比较棘手，我们可以使用IPolygon4接口，遍历IPolygon当中多有的外环和内环

下面给出代码示例：

 public  void PolygonToRing(IPolygon4 polygon)        {            IGeometryBag exteriorRingGeometryBag = polygon.ExteriorRingBag;            IGeometryCollection exteriorRingGeometryCollection = exteriorRingGeometryBag as IGeometryCollection;            for (int i = 0; i < exteriorRingGeometryCollection.GeometryCount; i++)            {                List<IPoint> PointResult = new List<IPoint>();                IGeometry exteriorRingGeometry = exteriorRingGeometryCollection.get_Geometry(i);                IPointCollection exteriorRingPointCollection = exteriorRingGeometry as IPointCollection;                ReadPoints(exteriorRingPointCollection,PointResult);                CreateJson(PointResult);                IGeometryBag interiorRingGeometryBag = polygon.get_InteriorRingBag(exteriorRingGeometry as IRing);                IGeometryCollection interiorRingGeometryCollection = interiorRingGeometryBag as IGeometryCollection;                for (int k = 0; k < interiorRingGeometryCollection.GeometryCount;k++ )                {                    IGeometry interiorRingGeometry = interiorRingGeometryCollection.get_Geometry(k);                    IPointCollection interiorRingPointCollection = interiorRingGeometry as IPointCollection;                    ReadPoints(interiorRingPointCollection, PointResult);                    CreateJson(PointResult);                }            }        }        /// <summary>        /// 获取结果多边形节点坐标        /// </summary>        /// <param name="ptCol"节>点集合</param>        private void ReadPoints(IPointCollection ptCol, List<IPoint> PointResult)        {            IPoint pnt;            for (int i = 0; i < ptCol.PointCount; i++)            {                pnt = ptCol.get_Point(i);                PointResult.Add(pnt);            }        }

ARCGIS复杂多边形基础知识讲解
http://www.cnblogs.com/willwayer/archive/2010/09/13/1824721.html

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