String getFileName(double lat, double lon) {
        int lonInt = getMinLonForTile(lon);
        int latInt = getMinLatForTile(lat);
        return toLowerCase(getNorthString(latInt) + getPaddedLatString(latInt) + getEastString(lonInt) + getPaddedLonString(lonInt));
    }
@Disabled
    @Test
    public void testGetEleVerticalBorder() {
        // Border between the tiles n42e011 and n43e011
        assertEquals("n42e011", instance.getFileName(42.999999, 11.48));
        assertEquals(420, instance.getEle(42.999999, 11.48), precision);
        assertEquals("n43e011", instance.getFileName(43.000001, 11.48));
        assertEquals(420, instance.getEle(43.000001, 11.48), precision);
    }