1.算法功能简介

等值线图能直观地展示数据的变化趋势,是众多领域展示成果的重要图建之一,被广泛应用于石油勘探、矿物开采、气象预报等众多领域。等值线的绘制是指从大量采样数据中提取出具有相同值的点的信息,并生成形态完整、位置精确的等值线的过程,包括等值线网格化、等值线追踪、等值线光滑、等值线填充与标注几个处理步骤。

PIE支持算法功能的执行,下面对等值线生成算法功能进行介绍。

2.算法功能实现说明

2.1. 实现步骤

第一步

算法参数设置

第二步

算法执行

第三步

结果显示

2.2. 算法参数

C#算法DLL

PIE.CommonAlgo.dll

C#算法名称

PIE.CommonAlgo.RasterToContourContructAlgo

参数结构体

RasterToContourContruct_Exchange_Info

参数说明

BandIndex

Int

波段

BAutoSetStartEndValue

bool

是否自动计算起始终止值

BClosed

bool

是否闭合

BGenerateContourFace

bool

是否生成等值面

BGenerateContourLine

bool

是否生成等值线

EndValue

double

终止值

InputRasterDataset

IRasterDataset

输入栅格数据集

OutputContourFaceFDataset

IFeatureDataset

输出等值面(内存)

OutputContourLineFDataset

IFeatureDataset

输出等值线 (内存)

SampleRatio

int

采样比

StartValue

double

起始值

ValueInterval

double

间隔

2.3. 示例代码

数据路径

百度云盘地址下/ PIE示例数据/栅格数/04.World/World.tif

视频路径

百度云盘地址下/PIE视频教程/10.算法调用/实用工具/等值线生成.avi

示例代码

          /// <summary>
/// 等值线生成算法测试
/// </summary>
private void Test_RasterToContourContructAlgo()
{
#region 1参数设置
#region 获取待加载文件路径
System.Windows.Forms.OpenFileDialog openFileDialog = new System.Windows.Forms.OpenFileDialog();
openFileDialog.Title = "请选择要打开的数据";
openFileDialog.Multiselect = true;
openFileDialog.Filter = "Tiff|*.tif;*.tiff|所有文件|*.*";
if (openFileDialog.ShowDialog() != System.Windows.Forms.DialogResult.OK) return;
string strFileName = openFileDialog.FileName;
#endregion
IRasterDataset rDataset = PIE.DataSource.DatasetFactory.OpenRasterDataset(strFileName, OpenMode.ReadOnly);
RasterToContourContruct_Exchange_Info info = new RasterToContourContruct_Exchange_Info();
info.InputRasterDataset = rDataset;
info.BandIndex = ;
info.BAutoSetStartEndValue = true;
info.BGenerateContourFace = true;
info.BGenerateContourLine = true;
info.BClosed = true;
info.ValueInterval = ;
info.SampleRatio = ;
#endregion
//2、算法执行
PIE.CommonAlgo.RasterToContourContructAlgo alog = new RasterToContourContructAlgo();
alog.Params = info;
alog.Execute();
//3、结果显示
info = alog.Params as RasterToContourContruct_Exchange_Info;
if (info.OutputContourFaceFDataset != null)//等值面
{
IFeatureLayer featureLayerFace = new FeatureLayer();
featureLayerFace.FeatureClass = new FeatureClass(info.OutputContourFaceFDataset);
m_HookHelper.FocusMap.AddLayer(featureLayerFace as ILayer);
}
if (info.OutputContourLineFDataset != null)//等值线
{
IFeatureLayer featureLayerLine = new FeatureLayer();
featureLayerLine.FeatureClass = new FeatureClass(info.OutputContourLineFDataset);
m_HookHelper.FocusMap.AddLayer(featureLayerLine as ILayer);
}
m_HookHelper.ActiveView.Refresh();
(rDataset as IDisposable).Dispose();
rDataset = null;
}

2.4. 示例截图

PIE SDK栅格生成等值线、面-LMLPHP

05-12 20:50