PIE SDK柵格生成等值線、面

 

1.算法功能簡介

    等值線圖能直觀地展現數據的變化趨勢，是衆多領域展現成果的重要圖建之一，被普遍應用於石油勘探、礦物開採、氣象預報等衆多領域。等值線的繪製是指從大量採樣數據中提取出具備相同值的點的信息，並生成形態完整、位置精確的等值線的過程，包括等值線網格化、等值線追蹤、等值線光滑、等值線填充與標註幾個處理步驟。

    PIE支持算法功能的執行，下面對等值線生成算法功能進行介紹。

2.算法功能實現說明

2.1. 實現步驟

第一步	算法參數設置
第二步	算法執行
第三步	結果顯示

2.2. 算法參數

C#算法DLL	PIE.CommonAlgo.dll
C#算法名稱	PIE.CommonAlgo.RasterToContourContructAlgo
參數結構體	RasterToContourContruct_Exchange_Info
參數說明
BandIndex	Int	波段
BAutoSetStartEndValue	bool	是否自動計算起始終止值
BClosed	bool	是否閉合
BGenerateContourFace	bool	是否生成等值面
BGenerateContourLine	bool	是否生成等值線
EndValue	double	終止值
InputRasterDataset	IRasterDataset	輸入柵格數據集
OutputContourFaceFDataset	IFeatureDataset	輸出等值面（內存）
OutputContourLineFDataset	IFeatureDataset	輸出等值線 (內存)
SampleRatio	int	採樣比
StartValue	double	起始值
ValueInterval	double	間隔

2.3. 示例代碼

數據路徑	百度雲盤地址下/ PIE示例數據/柵格數/04.World/World.tif
視頻路徑	百度雲盤地址下/PIE視頻教程/10.算法調用/實用工具/等值線生成.avi
示例代碼
1 /// <summary> 2 /// 等值線生成算法測試 3 /// </summary> 4 private void Test_RasterToContourContructAlgo() 5 { 6 #region 1參數設置 7 #region 獲取待加載文件路徑 8 System.Windows.Forms.OpenFileDialog openFileDialog = new System.Windows.Forms.OpenFileDialog(); 9 openFileDialog.Title = "請選擇要打開的數據"; 10 openFileDialog.Multiselect = true; 11 openFileDialog.Filter = "Tiff|*.tif;*.tiff|全部文件|*.*"; 12 if (openFileDialog.ShowDialog() != System.Windows.Forms.DialogResult.OK) return; 13 string strFileName = openFileDialog.FileName; 14 #endregion 15 IRasterDataset rDataset = PIE.DataSource.DatasetFactory.OpenRasterDataset(strFileName, OpenMode.ReadOnly); 16 RasterToContourContruct_Exchange_Info info = new RasterToContourContruct_Exchange_Info(); 17 info.InputRasterDataset = rDataset; 18 info.BandIndex = 1; 19 info.BAutoSetStartEndValue = true; 20 info.BGenerateContourFace = true; 21 info.BGenerateContourLine = true; 22 info.BClosed = true; 23 info.ValueInterval = 50; 24 info.SampleRatio = 20; 25 #endregion 26 //二、算法執行 27 PIE.CommonAlgo.RasterToContourContructAlgo alog = new RasterToContourContructAlgo(); 28 alog.Params = info; 29 alog.Execute(); 30 //三、結果顯示 31 info = alog.Params as RasterToContourContruct_Exchange_Info; 32 if (info.OutputContourFaceFDataset != null)//等值面 33 { 34 IFeatureLayer featureLayerFace = new FeatureLayer(); 35 featureLayerFace.FeatureClass = new FeatureClass(info.OutputContourFaceFDataset); 36 m_HookHelper.FocusMap.AddLayer(featureLayerFace as ILayer); 37 } 38 if (info.OutputContourLineFDataset != null)//等值線 39 { 40 IFeatureLayer featureLayerLine = new FeatureLayer(); 41 featureLayerLine.FeatureClass = new FeatureClass(info.OutputContourLineFDataset); 42 m_HookHelper.FocusMap.AddLayer(featureLayerLine as ILayer); 43 } 44 m_HookHelper.ActiveView.Refresh(); 45 (rDataset as IDisposable).Dispose(); 46 rDataset = null; 47 } View Code

2.4. 示例截圖