int getMinLatForTile(double lat) {
        return (int) (Math.floor((90 + lat) / latDegree) * latDegree) - 90;
    }
@Test
    public void testMinLat() {
        assertEquals(52, instance.getMinLatForTile(52.5));
        assertEquals(29, instance.getMinLatForTile(29.9));
        assertEquals(-60, instance.getMinLatForTile(-59.9));
    }