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  • ISurfaceOp 接口生成等高线(一)

    (1)ISurfaceOp.Contour 根据DEM生成等高线图层:

           private void button1_Click(object sender, EventArgs e)
            {
                //得到Raster
                ILayer tLayer=this.axMapControl1.get_Layer(0);
                IRasterLayer tRasterLayer=(IRasterLayer)tLayer;

                IFeatureClass tFeatureClass=null;
                IGeoDataset tGeodataset=null;
                //使用接口 参数(Raster,等高线间距,基值)
                ISurfaceOp tSurfaceop = new RasterSurfaceOpClass();
                object obj = 0;
                tGeodataset=tSurfaceop.Contour((IGeoDataset)tRasterLayer.Raster, 10, ref obj);
                //判断是否生成等高线层,如果生成,加载到Map中
                if (tGeodataset != null)
                {
                    tFeatureClass = (IFeatureClass)tGeodataset;
                    if (tFeatureClass != null)
                    {
                        IFeatureLayer tFeatureLayer = new FeatureLayerClass();
                        tFeatureLayer.FeatureClass = tFeatureClass;
                        this.axMapControl1.AddLayer((ILayer)tFeatureLayer);
                        this.axMapControl1.Refresh();
                    }
                }
            }

    (2) ISurfaceOp.ContourAsPolyline 根据已知点,返回穿过改点的等高线和改点的高程

           private void axMapControl1_OnMouseDown(object sender, ESRI.ArcGIS.Controls.IMapControlEvents2_OnMouseDownEvent e)
            {
                //通过鼠标获取点击的点坐标
                IPoint tPoint = new PointClass();
                tPoint.X = e.mapX;
                tPoint.Y = e.mapY;
                //得到Raster
                ILayer tLayer = this.axMapControl1.get_Layer(0);
                IRasterLayer tRasterLayer = (IRasterLayer)tLayer;
               

                ISurfaceOp tSurfaceop = new RasterSurfaceOpClass();

                //定义返回的线
                IPolyline tPolygline = new PolylineClass();
                //定义返回的高程点
                double tEve = 0;
                tSurfaceop.ContourAsPolyline((IGeoDataset)tRasterLayer.Raster, tPoint, out tPolygline, out tEve);//tSurfaceop.Contour((IGeoDataset)tRasterLayer.Raster, 10, ref obj);

                //把生成的等高线画到Map上
                ILineElement tLineElement = new LineElementClass();
                IElement tElement = (IElement)tLineElement;
                tElement.Geometry = tPolygline;
                this.axMapControl1.ActiveView.GraphicsContainer.AddElement(tElement, 0);
                //刷新Map
                this.axMapControl1.Refresh();
            }

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  • 原文地址:https://www.cnblogs.com/cglNet/p/1970061.html
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