상속: GeodesicSphereDistCalc
        public void TestCustom()
        {
            SpatialContext sc = Call("units", "u");
            Assert.Equal(DistanceUnits.CARTESIAN, sc.GetUnits());
            Assert.Equal(new CartesianDistCalc(), sc.GetDistCalc());

            sc = Call("units", "u",
                      "distCalculator", "cartesian^2",
                      "worldBounds", "-100 0 75 200");//West South East North
            Assert.Equal(new CartesianDistCalc(true), sc.GetDistCalc());
            Assert.Equal(new RectangleImpl(-100, 75, 0, 200), sc.GetWorldBounds());

            sc = Call("units", "miles",
                      "distCalculator", "lawOfCosines");
            Assert.Equal(DistanceUnits.MILES, sc.GetUnits());
            var test = new GeodesicSphereDistCalc.LawOfCosines(sc.GetUnits().EarthRadius());
            Assert.Equal(test, sc.GetDistCalc());
        }
        public void TestCustom()
        {
            SpatialContext sc = Call("geo", "false");
            Assert.True(!sc.IsGeo());
            Assert.Equal(new CartesianDistCalc(), sc.GetDistCalc());

            sc = Call("geo", "false",
                      "distCalculator", "cartesian^2",
                      "worldBounds", "-100 0 75 200");//West South East North
            Assert.Equal(new CartesianDistCalc(true), sc.GetDistCalc());
            Assert.Equal(new RectangleImpl(-100, 75, 0, 200, sc), sc.GetWorldBounds());

            sc = Call("geo", "true",
                      "distCalculator", "lawOfCosines");
            Assert.True(sc.IsGeo());
            var test = new GeodesicSphereDistCalc.LawOfCosines();
            Assert.Equal(test, sc.GetDistCalc());
        }