allow max zoom of 21 - two portals 18cm apart only show at z=21
allow max zoom of 21 - two portals 18cm apart only show at z=21

michmerr/ingress-intel-total-conversion,michmerr/ingress-intel-total-conversion,michmerr/ingress-intel-total-conversion,michmerr/ingress-intel-total-conversion,michmerr/ingress-intel-total-conversion,michmerr/ingress-intel-total-conversion