利用IFeatureIndex2 和 IIndexQuery2提高空间查询效率

http://www.cnblogs.com/cglNet/archive/2012/03/12/2391645.html

 1 StringBuilder tSB = new StringBuilder();
 2 
 3             IFeatureClass tFeatureClass = (IFeatureClass)this._InDataset;
 4 
 5            
 6 
 7             IGeoDataset tGeodataset=(IGeoDataset)this._InDataset;
 8 
 9  
10 
11             IFeatureIndex2 tFeatureIndex = new FeatureIndexClass();
12 
13             ESRI.ArcGIS.esriSystem.ITrackCancel tTrackCancel=new CancelTracker();
14 
15             IIndexQuery tIndexQuery = tFeatureIndex as IIndexQuery;
16 
17             IIndexQuery2 tIndexQuery2 = (IIndexQuery2)tIndexQuery;
18 
19             tFeatureIndex.FeatureClass = tFeatureClass;
20 
21             tFeatureIndex.set_OutputSpatialReference(tFeatureClass.OIDFieldName, tGeodataset.SpatialReference);
22 
23             tFeatureIndex.Index(tTrackCancel, tGeodataset.Extent);//tGeodataset.Extent
24 
25  
26 
27             int iDex = tFeatureClass.FindField(this._FieldName);
28 
29             for (int i = 0; i < _Rows; i++)
30 
31             {
32 
33                 for (int j = 0; j < _Cols; j++)
34 
35                 {
36 
37                     double[] pX = null;
38 
39                     double[] pY = null;
40 
41                     getPolygon(i, j, ref pX, ref pY);
42 
43                     IPoint tPoint = new PointClass();
44 
45                     tPoint.X = pX[0] + (pX[3] - pX[0]) / 2;
46 
47                     tPoint.Y = pY[0] + (pY[0] - pY[3]) / 2;
48 
49                     
50 
51                     int oid= tIndexQuery2.WithinFeature(tPoint);
52 
53                     if (oid>-1)
54 
55                     {
56 
57                         IFeature tFeature = tFeatureClass.GetFeature(oid);
58 
59                         object o = tFeature.get_Value(iDex);
60 
61                         if (o != null && o.ToString().Trim() != "")
62 
63                         {
64 
65                             tSB.Append(o.ToString() + "  ");
66 
67                         }
68 
69                         else
70 
71                         {
72 
73                             tSB.Append("-9999" + "  ");
74 
75                         }
76 
77                     }
78 
79                     else
80 
81                     {
82 
83                         tSB.Append("-9999" + "  ");
84 
85                     }
86 
87                    
88 
89                 }
90 
91             }
92 
93          
94 
95             return tSB;
96 
97         }

 

posted @ 2013-04-10 01:02  iLocationStudio  阅读(656)  评论(0)  编辑  收藏  举报