maptalks - 自定义地图LOD

自定义地图LOD
index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>地图 - 自定义地图LOD</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://unpkg.com/maptalks/dist/maptalks.css">
  <script type="text/javascript" src="https://unpkg.com/maptalks/dist/maptalks.min.js"></script>
  <body>

    <div id="map" class="container"></div>
    <script>
      var MAX_ZOOM = 28;
      var spatialReference = {
          'projection': 'EPSG:3857',
          'resolutions': (function () {
              const resolutions = [];
              const d = 2 * 6378137 * Math.PI;
              for (let i = 0; i < MAX_ZOOM; i++) {
                  resolutions[i] = d / (256 * Math.pow(2, i));
              }
              return resolutions;
          })(),
          'fullExtent': {
              'top': 6378137 * Math.PI,
              'left': -6378137 * Math.PI,
              'bottom': -6378137 * Math.PI,
              'right': 6378137 * Math.PI
          }
      };

      var map = new maptalks.Map('map', {
        center: [-0.113049,51.498568],
        zoom: 14,
        spatialReference: spatialReference,
        baseLayer: new maptalks.TileLayer('base', {
          maxAvailableZoom: 20,
          urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        }),
        layers: [
          new maptalks.VectorLayer('v')
        ]
      });

    </script>
  </body>
</html>