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  • ArcGIS Spatial Query

    Creates a spatial query which performs a spatial search for features in the supplied feature class and has the option to also apply an attribute query via a where clause.

    ///<summary>Creates a spatial query which performs a spatial search for features in the supplied feature class and has the option to also apply an attribute query via a where clause.</summary>
    ///  
    ///<param name="featureClass">An ESRI.ArcGIS.Geodatabase.IFeatureClass</param>
    ///<param name="searchGeometry">An ESRI.ArcGIS.Geometry.IGeometry (Only high-level geometries can be used)</param>
    ///<param name="spatialRelation">An ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum (e.g., esriSpatialRelIntersects)</param>
    ///<param name="whereClause">A System.String, (e.g., "city_name = 'Redlands'").</param>
    ///   
    ///<returns>An IFeatureCursor holding the results of the query will be returned.</returns>
    ///   
    ///<remarks>Call the SpatialQuery method by passing in a reference to the Feature Class, a Geometry used for the search and the spatial operation to be preformed. An exmaple of a spatial opertaion would be intersects (e.g., esriSpatialRelEnum.esriSpatialRelContains). If you would like to return everything found by the spatial operation use "" for the where clause. Optionally a whereclause (e.g. "income > 1000") maybe applied if desired. The SQL syntax used to specify the where clause is the same as that of the underlying database holding the data.</remarks>
    public ESRI.ArcGIS.Geodatabase.IFeatureCursor PerformSpatialQuery(ESRI.ArcGIS.Geodatabase.IFeatureClass featureClass, ESRI.ArcGIS.Geometry.IGeometry searchGeometry, ESRI.ArcGIS.Geodatabase.esriSpatialRelEnum spatialRelation, System.String whereClause)
    {
      // create a spatial query filter
      ESRI.ArcGIS.Geodatabase.ISpatialFilter spatialFilter = new ESRI.ArcGIS.Geodatabase.SpatialFilterClass();
    
      // specify the geometry to query with
      spatialFilter.Geometry = searchGeometry;
    
      // specify what the geometry field is called on the Feature Class that we will be querying against
      System.String nameOfShapeField = featureClass.ShapeFieldName;
      spatialFilter.GeometryField = nameOfShapeField;
    
      // specify the type of spatial operation to use
      spatialFilter.SpatialRel = spatialRelation;
    
      // create the where statement
      spatialFilter.WhereClause = whereClause;
    
      // perform the query and use a cursor to hold the results
      ESRI.ArcGIS.Geodatabase.IQueryFilter queryFilter = new ESRI.ArcGIS.Geodatabase.QueryFilterClass();
      queryFilter = (ESRI.ArcGIS.Geodatabase.IQueryFilter)spatialFilter;
      ESRI.ArcGIS.Geodatabase.IFeatureCursor featureCursor = featureClass.Search(queryFilter, false);
    
      return featureCursor;
    }
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  • 原文地址:https://www.cnblogs.com/arxive/p/6120019.html
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