/// <summary>
 /// Sets the Threshold for constructing a Geometric Graph
 /// </summary>
 /// <param name="threshold">Maximum acceptable distance (inclusive)</param>
 public void SetThreshold(double threshold)
 {
     _graphType = GeoGraphType.SpecifiedThreshold;
     _threshold = threshold;
     if (threshold <= 0)
     {
         _threshold = 1;
     }
 }
 public void SetMinimumConnectivity()
 {
     _graphType = GeoGraphType.MinimumConnectivity;
 }