ArcEngine由点生成TIN

傷城~ 2022-08-27 05:45 119阅读 0赞

这两天替别人写一个三维校园的展示程序，用的是SceneControl二次开发。需要利用DOM和TIN构建三维地形。现在说下根据高程点生成TIN的过程：

（1）根据高程点文件（Excel）生成点shapefile

（2）使用ITinEdit的AddFromFeatureClass方法生成TIN

高程点数据格式如下：

![Center][]

操作界面如下：

![Center 1][]：

生成TIN效果图：

![Center 2][]

代码很容易理解，如下：

#region 创建TIN
            private void button_ok_Click(object sender , EventArgs e)
            {
                try
                {
                    strTinName=textBox_TINName.Text;
                    outFolder=textBox_outpath.Text;
                    if (strTinName=="")
                    {
                        MessageBox.Show("请输入TIN名称！");
                    } 
                    else if (outFolder=="")
                    {
                        MessageBox.Show("请选择TIN保存路径");
                    }
                    else
                    {
                        //生成点shape
                        Excel2Shape excel2shape = new Excel2Shape(textBox_point.Text);
                        excel2shape.CreateShapeFromExcel();
    
                        //获取shapefile
                        string path = excel2shape.path;
                        string name = excel2shape.name;
    
                        IWorkspaceFactory pWSFac = new ShapefileWorkspaceFactoryClass();
                        IFeatureWorkspace pFeatureWS = pWSFac.OpenFromFile(path , 0) as IFeatureWorkspace;
                        IFeatureClass pFeatureClass = pFeatureWS.OpenFeatureClass(name);
                        IField pField = pFeatureClass.Fields.get_Field(pFeatureClass.FindField("Z"));
                        //创建TIN
                        ITin pTin = Create_TIN(pFeatureClass , pField , outFolder);
                        ITinLayer pTinlayer = new TinLayerClass();
                        pTinlayer.Dataset = pTin;
                        pTinlayer.Name = strTinName;
    
                        pSceneControl.SceneGraph.Scene.AddLayer(pTinlayer as ILayer , true);
    
                        this.Close();
                    }
                  
                }
                catch (System.Exception ex)
                {
                    MessageBox.Show(ex.Message + "创建TIN失败！");
                }
    
            }
            /// <summary>
            /// 创建TIN
            /// </summary>
            /// <param name="pFeatureClass">点要素类</param>
            /// <param name="pField">Z字段</param>
            /// <param name="pPath">路径</param>
            public ITin Create_TIN(IFeatureClass pFeatureClass , IField pField , string pPath)
            {
                IGeoDataset pGeoDataset = pFeatureClass as IGeoDataset;
                ITinEdit pTinEdit = new TinClass();
                pTinEdit.InitNew(pGeoDataset.Extent);
                object pObj = Type.Missing;
    
                pTinEdit.AddFromFeatureClass(pFeatureClass , null , pField , null ,
                esriTinSurfaceType.esriTinMassPoint , ref pObj);
                if (System.IO.File.Exists(pPath))
                {
                    _3DCampus.helper.FolderHelper.DeleteFolder(pPath);
                }
                pTinEdit.SaveAs(pPath , ref pObj);
                pTinEdit.Refresh();
                return pTinEdit as ITin;
    
            }
            #endregion

[Center]: /images/20220824/54a1dd7a3bef4a5b96c7214c407a1c73.png
[Center 1]: /images/20220824/b0019d12933c4273910429b0934981d3.png
[Center 2]: /images/20220824/b32440e56b954ac9b16e6e2010e7e191.png