According to the latest [spec](https://github.com/mapbox/utfgrid-spec/blob/master/1.2/utfgrid.md): "By default, UTFGrid operates on a 2x2 grid."
According to the latest [spec](https://github.com/mapbox/utfgrid-spec/blob/master/1.2/utfgrid.md): "By default, UTFGrid operates on a 2x2 grid."