} // private ArrayList CollectNodes( int opCode )
/// <summary>
/// This method simplifies the resultant Geometry by finding and eliminating
/// "covered" points.
/// A point is covered if it is contained in another element Geometry
/// with higher dimension (e.g. a point might be contained in a polygon,
/// in which case the point can be eliminated from the resultant).
/// </summary>
/// <param name="resultNodeList"></param>
/// <returns></returns>
private ArrayList SimplifyPoints(ArrayList resultNodeList)
{
ArrayList nonCoveredPointList = new ArrayList();
foreach (object obj in resultNodeList)
{
Node n = (Node)obj;
Coordinate coord = n.GetCoordinate();
if (!_op.IsCoveredByLA(coord))
{
Point pt = _geometryFactory.CreatePoint(coord);
nonCoveredPointList.Add(pt);
} // if ( !_op.IsCoveredByLA( coord ) )
} // foreach ( object obj in resultNodeList )
return(nonCoveredPointList);
} // private ArrayList SimplifyPoints( ArrayList resultNodeList )
