arcgis engine 计算距离面积体积

ArcGIS Engine二次开发——计算shapefile面图层要素的面积

http://blog.csdn.net/giselite/article/details/44750349

全部都应该学会看AE的类图和帮助，尤其是类图，在安装目录下的Diagram目录里，看多了自然就会得心应手。废话不多说了，下面是我写的一段试验代码

，公布一下，希望能帮助那些有需求的童鞋，给他们节省点时间。

using System.Runtime;

using System.Runtime.InteropServices;

using ESRI.ArcGIS.Geodatabase;

using ESRI.ArcGIS.DataSourcesFile;

using ESRI.ArcGIS.Geometry;

private void Form1_Click(object sender, EventArgs e)

{

IWorkspaceFactory pWSF = null;

double dArea = 0;

try

{

pWSF = new ShapefileWorkspaceFactoryClass();

IFeatureWorkspace pWS = pWSF.OpenFromFile(@"H:\水体淹没面积", 0) as IFeatureWorkspace;

IFeatureClass pFC = pWS.OpenFeatureClass("水体淹没面积专题.shp");

IFeatureCursor pFeatureCur = pFC.Search(null, false);

IFeature pFeature = pFeatureCur.NextFeature();

while (pFeature != null)

{

if (pFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolygon)

{

IArea pArea = pFeature.Shape as IArea;

dArea = dArea + pArea.Area;

}

pFeature = pFeatureCur.NextFeature();

}

Marshal.ReleaseComObject(pFeatureCur);

}

catch (System.Exception ex)

{

}

Marshal.ReleaseComObject(pWSF);

}

========

6.5 IProximityOperator接口

http://www.cnblogs.com/gisoracle/archive/2012/03/28/2420706.html

6.5.1 IProximityOperator接口简介

IProximityOperator接口用于获取两个几何图形的距离，以及给定一个 Point，求另一个几何图形上离离给定点最近的点。IProximityOperator接口的主

要方法有：QueryNearesPoint,ReturnDistance, ReturnNearestPoint

ReturnDistance方法用于返回两个几何对象间的最短距离，QueryNearesPoint方法用于查询获取几何对象上离给定输入点的最近距离的点的引用，

ReturnNearestPoint方法用于创建并返回几何对象上离给定输入点的最近距离的点。

6.5.2 最近点查询功能开发

以下代码片段演示如何使用IProximityOperator接口获取给定点与要查询的几何图形的最近点：

/// 在pGeometry上返回一个离pInputPoint最近的point

/// </summary>

/// <param name="pInputPoint">给定的点对象</param>

/// <param name="pGeometry">要查询的几何图形</param>

/// <returns>the nearest Point</returns>

private IPoint NearestPoint(IPoint pInputPoint, IGeometry pGeometry)

{

try

{

　IProximityOperator pProximity = (IProximityOperator)pGeometry;

IPoint pNearestPoint = pProximity.ReturnNearestPoint(pInputPoint, esriSegmentExtension.esriNoExtension);

return pNearestPoint;

}

catch(Exception Err)

{

MessageBox.Show(Err.Message, "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);

return null;

}

}

复制代码

以下代码片段演示如何使用IProximityOperator接口查询给定的两个几何对象的距离：

/// <summary>

/// 获取两个几何图形的距离

/// </summary>

/// <param name="pGeometryA">几何图形A</param>

/// <param name="pGeometryB">几何图形B</param>

/// <returns>两个几何图形的距离</returns>

private double GetTwoGeometryDistance(IGeometry pGeometryA, IGeometry pGeometryB)

{

IProximityOperator pProOperator = pGeometryA as IProximityOperator;

if (pGeometryA!=null|| pGeometryB !=null)

{

double distance= pProOperator.ReturnDistance(pGeometryB);

return distance;

}

else

{

return 0;

}

}

========

空间关系(计算两点间距离、计算范围)

http://xitong.iteye.com/blog/1715755

计算两点间距离

1 /// <summary>计算两点间距离

2 /// </summary>

3 /// <param name="point1"></param>

4 /// <param name="point2"></param>

5 /// <returns></returns>

6 public static double getDistanceOfTwoPoints(ESRI.ArcGIS.Geometry.IPoint point1, ESRI.ArcGIS.Geometry.IPoint point2)

7 {

8 return Math.Sqrt((point1.X - point2.X) * (point1.X - point2.X) + (point1.Y - point2.Y) * (point1.Y - point2.Y));

9 }

feature平移

1 IGeometry geo＝feature.Shape;

2 ((ITransform2D)geo).Move(20,20);

计算范围

得到点集合的n倍Envelope范围

1 /// <summary>得到点集合的n倍Envelope范围

2 /// </summary>

3 /// <param name="points"></param>

4 /// <param name="zoomInNumber"></param>

5 /// <returns></returns>

6 public static IEnvelope getBigEnvelope(IPointCollection points, double zoomInNumber)

7 {

8 IEnvelope result = new EnvelopeClass();

9

10 double xmax = 0, xmin = 999999999999, ymax = 0, ymin = 999999999999;

11

12 for (int i = 0; i < points.PointCount; i++)

13 {

14 ESRI.ArcGIS.Geometry.IPoint p = points.get_Point(i);

15 if (xmax < p.X) xmax = p.X;

16 if (ymax < p.Y) ymax = p.Y;

17 if (xmin > p.X) xmin = p.X;

18 if (ymin > p.Y) ymin = p.Y;

19 }

20 result.XMax = xmax + xmax - xmin;

21 result.XMin = xmin - xmax + xmin;

22 result.YMax = ymax + ymax - ymin;

23 result.YMin = ymin - ymax + ymin;

24

25 return result;

26 }

========