function editWorld() {
  if (customization) return;
  $('#worldConfigurator').dialog({
    title: 'Configure World',
    resizable: false,
    width: '42em',
    buttons: {
      'Whole World': () => applyWorldPreset(100, 50),
      Northern: () => applyWorldPreset(33, 25),
      Tropical: () => applyWorldPreset(33, 50),
      Southern: () => applyWorldPreset(33, 75),
      'Restore Winds': restoreDefaultWinds
    },
    open: function () {
      const buttons = $(this).dialog('widget').find('.ui-dialog-buttonset > button');
      buttons[0].addEventListener('mousemove', () => tip('Click to set map size to cover the whole World'));
      buttons[1].addEventListener('mousemove', () => tip('Click to set map size to cover the Northern latitudes'));
      buttons[2].addEventListener('mousemove', () => tip('Click to set map size to cover the Tropical latitudes'));
      buttons[3].addEventListener('mousemove', () => tip('Click to set map size to cover the Southern latitudes'));
      buttons[4].addEventListener('mousemove', () => tip('Click to restore default wind directions'));
    },
    close: function () {
      $(this).dialog('destroy');
    }
  });

  const globe = d3.select('#globe');
  const clr = d3.scaleSequential(d3.interpolateSpectral);
  const tMax = 30,
    tMin = -25; // temperature extremes
  const projection = d3.geoOrthographic().translate([100, 100]).scale(100);
  const path = d3.geoPath(projection);

  updateGlobeTemperature();
  updateGlobePosition();

  if (modules.editWorld) return;
  modules.editWorld = true;

  document.getElementById('worldControls').addEventListener('input', (e) => updateWorld(e.target));
  globe.select('#globeWindArrows').on('click', changeWind);
  globe.select('#globeGraticule').attr('d', round(path(d3.geoGraticule()()))); // globe graticule
  updateWindDirections();

  function updateWorld(el) {
    if (el) {
      document.getElementById(el.dataset.stored + 'Input').value = el.value;
      document.getElementById(el.dataset.stored + 'Output').value = el.value;
      if (el.dataset.stored) lock(el.dataset.stored);
    }

    updateGlobeTemperature();
    updateGlobePosition();
    calculateTemperatures();
    generatePrecipitation();
    const heights = new Uint8Array(pack.cells.h);
    Rivers.generate();
    Lakes.defineGroup();
    Rivers.specify();
    pack.cells.h = new Float32Array(heights);
    defineBiomes();

    if (layerIsOn('toggleTemp')) drawTemp();
    if (layerIsOn('togglePrec')) drawPrec();
    if (layerIsOn('toggleBiomes')) drawBiomes();
    if (layerIsOn('toggleCoordinates')) drawCoordinates();
    if (layerIsOn('toggleRivers')) drawRivers();
    if (document.getElementById('canvas3d')) setTimeout(ThreeD.update(), 500);
  }

  function updateGlobePosition() {
    const size = +document.getElementById('mapSizeOutput').value;
    const eqD = ((graphHeight / 2) * 100) / size;

    calculateMapCoordinates();
    const mc = mapCoordinates; // shortcut
    const scale = +distanceScaleInput.value,
      unit = distanceUnitInput.value;
    const meridian = toKilometer(eqD * 2 * scale);
    document.getElementById('mapSize').innerHTML = `${graphWidth}x${graphHeight}`;
    document.getElementById('mapSizeFriendly').innerHTML = `${rn(graphWidth * scale)}x${rn(graphHeight * scale)} ${unit}`;
    document.getElementById('meridianLength').innerHTML = rn(eqD * 2);
    document.getElementById('meridianLengthFriendly').innerHTML = `${rn(eqD * 2 * scale)} ${unit}`;
    document.getElementById('meridianLengthEarth').innerHTML = meridian ? ' = ' + rn(meridian / 200) + '%🌏' : '';
    document.getElementById('mapCoordinates').innerHTML = `${lat(mc.latN)} ${Math.abs(rn(mc.lonW))}°W; ${lat(mc.latS)} ${rn(mc.lonE)}°E`;

    function toKilometer(v) {
      if (unit === 'km') return v;
      else if (unit === 'mi') return v * 1.60934;
      else if (unit === 'lg') return v * 5.556;
      else if (unit === 'vr') return v * 1.0668;
      return 0; // 0 if distanceUnitInput is a custom unit
    }

    function lat(lat) {
      return lat > 0 ? Math.abs(rn(lat)) + '°N' : Math.abs(rn(lat)) + '°S';
    } // parse latitude value
    const area = d3.geoGraticule().extent([
      [mc.lonW, mc.latN],
      [mc.lonE, mc.latS]
    ]);
    globe.select('#globeArea').attr('d', round(path(area.outline()))); // map area
  }

  function updateGlobeTemperature() {
    const tEq = +document.getElementById('temperatureEquatorOutput').value;
    document.getElementById('temperatureEquatorF').innerHTML = rn((tEq * 9) / 5 + 32);
    const tPole = +document.getElementById('temperaturePoleOutput').value;
    document.getElementById('temperaturePoleF').innerHTML = rn((tPole * 9) / 5 + 32);
    globe.selectAll('.tempGradient90').attr('stop-color', clr(1 - (tPole - tMin) / (tMax - tMin)));
    globe.selectAll('.tempGradient60').attr('stop-color', clr(1 - (tEq - ((tEq - tPole) * 2) / 3 - tMin) / (tMax - tMin)));
    globe.selectAll('.tempGradient30').attr('stop-color', clr(1 - (tEq - ((tEq - tPole) * 1) / 3 - tMin) / (tMax - tMin)));
    globe.select('.tempGradient0').attr('stop-color', clr(1 - (tEq - tMin) / (tMax - tMin)));
  }

  function updateWindDirections() {
    globe
      .select('#globeWindArrows')
      .selectAll('path')
      .each(function (d, i) {
        const tr = parseTransform(this.getAttribute('transform'));
        this.setAttribute('transform', `rotate(${options.winds[i]} ${tr[1]} ${tr[2]})`);
      });
  }

  function changeWind() {
    const arrow = d3.event.target.nextElementSibling;
    const tier = +arrow.dataset.tier;
    options.winds[tier] = (options.winds[tier] + 45) % 360;
    const tr = parseTransform(arrow.getAttribute('transform'));
    arrow.setAttribute('transform', `rotate(${options.winds[tier]} ${tr[1]} ${tr[2]})`);
    localStorage.setItem('winds', options.winds);
    const mapTiers = d3.range(mapCoordinates.latN, mapCoordinates.latS, -30).map((c) => ((90 - c) / 30) | 0);
    if (mapTiers.includes(tier)) updateWorld();
  }

  function restoreDefaultWinds() {
    const defaultWinds = [225, 45, 225, 315, 135, 315];
    const mapTiers = d3.range(mapCoordinates.latN, mapCoordinates.latS, -30).map((c) => ((90 - c) / 30) | 0);
    const update = mapTiers.some((t) => options.winds[t] != defaultWinds[t]);
    options.winds = defaultWinds;
    updateWindDirections();
    if (update) updateWorld();
  }

  function applyWorldPreset(size, lat) {
    document.getElementById('mapSizeInput').value = document.getElementById('mapSizeOutput').value = size;
    document.getElementById('latitudeInput').value = document.getElementById('latitudeOutput').value = lat;
    lock('mapSize');
    lock('latitude');
    updateWorld();
  }
}