private int DoRadius(ISpatialIndex <ILineString> index)
 {
     {
         var c = new Coordinate2D(11.343629, 48.083797);
         var r = 50;
         index.Radius(c, r);
     }
     {
         var c = new Coordinate2D(11.344827, 48.083752);
         var r = 10;
         index.Radius(c, r);
     }
     {
         var c = new Coordinate2D(11.344827, 48.083752);
         var r = 5;
         index.Radius(c, r);
     }
     return(0);
 }