public int Compare(ILinearRing x, ILinearRing y)
{
var pm = PrecisionModel.MostPrecise(x.PrecisionModel, y.PrecisionModel);
var geometryFactory = new GeometryFactory(pm);
var p1 = geometryFactory.CreatePolygon(x, null);
var p2 = geometryFactory.CreatePolygon(y, null); ;
if (p1.Area < p2.Area)
return _r1;
return p1.Area > p2.Area ? _r2 : 0;
}