examples/Leaflet.PolarMap/shapefiles/demo.js
function (featureData, layer) {
      var coords = featureData.geometry.coordinates;
      return boundsLimit.contains(L.latLng([coords[1], coords[0]]));
    }
function (featureData, layer) {
      var coords = featureData.geometry.coordinates;
      return boundsLimit.contains(L.latLng([coords[1], coords[0]]));
    }
avoid loading features South of 45N. Errors will occur when loading Antarctic data.