arcgis engine 计算距离面积体积

旧城等待， 2022-09-21 13:02 225阅读 0赞

# 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         \}  
========