先來看看ITopologicalOperator的成員：截圖來自幫助文檔：

簡要介紹下各個成員的漢語翻譯：

1、Boundary，邊界，獲取一個Geometry的邊界；

用法：

ITopologicalOperator pTopologBoundary = pGeo as ITopologicalOperator;IGeometry pGeometry = pTopologBoundary.Boundary;（1）多邊形Polygon的邊界獲取的是Polyline

（2）Polyline獲得的是IPiontColletion點集；（3）點沒有邊界

2、Buffer，緩沖區(qū)，可以為點、線、面做緩沖區(qū)，參數(shù)為緩沖區(qū)范圍的大小，大于0向外做緩沖區(qū)，小于0向內(nèi)做緩沖區(qū)；

用法：

ITopologicalOperator pTopologBoundary = pGeo as ITopologicalOperator; IGeometry pGeometry = pTopologBoundary.Buffer(2);

3、Clip，疊加裁剪，從源圖層中裁剪掉分割圖層后的圖形；參數(shù)類型為IEnvelope類型

用法：

ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator; pTopologBoundary.Clip(pClipGeometry.Envelope as IEnvelope);

4、Cut，分割，將一個Geometry分割為兩部分。

用法：

IGeometry pSourceGeometry = null, pClipGeometry = null; IGeometry pLeftGeo,pRightGo; IPolyline pPolyline=null; ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator; pTopologBoundary.Cut(pPolyline, out pLeftGeo, out pRightGo);
5、Difference，區(qū)別，保留下源圖層與操作圖層中不同的部分。

用法：

IGeometry pSourceGeometry = null, pDifGeometry = null; ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator; IGeometry pResultGeo= pTopologBoundary.Difference(pDifGeometry);
6、Intersect，相交，求兩個圖層相交，返回IGeometry對象

用法：

ITopologicalOperator pTopological = (pSubFeature.Shape) as ITopologicalOperator; IGeometry pGeoIntersect=pTopological.Intersect(pFeature.Shape, esriGeometryDimension.esriGeometry2Dimension);
7、IsSimple，是否拓撲閉合

用法：

ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator; bool bIsSimple = pTopologBoundary.IsSimple;8、Simplify，使一個Geometry拓撲閉合；

用法：

ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator; pTopologBoundary.Simplify();9、Union，使Geometry組合起來用法：<pre name="code" class="csharp">IGeometry pSourceGeometry = null, pUnionGeometry = null; ITopologicalOperator pTopologBoundary = pSourceGeometry as ITopologicalOperator; IGeometry pUnionGeo=pTopologBoundary.Union(pUnionGeometry);

轉(zhuǎn)載于:https://www.cnblogs.com/dengshiwei/p/4258716.html

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