nz-seafloor.js

var map = new L.Map('map', {
  crs:  L.CRS.proj4js('EPSG:3994', '+proj=merc +lon_0=100 +lat_ts=-41 +x_0=0 +y_0=0 +datum=WGS84 +units=m +no_defs', new L.Transformation(1, -4200000, -1, -2000000)),
  scale: function(zoom) {
    return 1 / (16000 / Math.pow(2, zoom));
  },
  layers: [
    new L.TileLayer('tiles/nz-seafloor/{z}/{x}/{y}.png', {
      attribution: 'Data from <a href="http://www.niwa.co.nz/our-science/oceans/bathymetry">NIWA</a> and <a href="http://data.linz.govt.nz/">LINZ</a>',
      minZoom: 0,
      maxZoom: 6,
      continuousWorld: true
    })
  ],
  center: new L.LatLng(-37.562, 177.291),
  zoom: 3,
  continuousWorld: true
});