图层最小/最大分辨率

minResolution 1 maxResolution 1 resolution 1

根据当前视图分辨率显示/隐藏图层.

放大两次：MapBox 图层应该隐藏，OSM 图层应该显示。

如果继续放大，你将看到 OSM 图层也会消失。

这里使用 minResolution 和 maxResolution 选项参数来控制图层显示影藏的渲染。

main.js

import Map from 'ol/Map.js';
import OSM from 'ol/source/OSM.js';
import TileJSON from 'ol/source/TileJSON.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';

const key =
  'Your Mapbox access token from https://mapbox.com/ here';

/**
 * Create the map.
 */
const map = new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
      minResolution: 200,
      maxResolution: 2000,
    }),
    new TileLayer({
      source: new TileJSON({
        url:
          'https://api.tiles.mapbox.com/v4/mapbox.natural-earth-hypso-bathy.json?secure&access_token=' +
          key,
        crossOrigin: 'anonymous',
      }),
      minResolution: 2000,
      maxResolution: 20000,
    }),
  ],
  target: 'map',
  view: new View({
    center: [653600, 5723680],
    zoom: 5,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Layer Min/Max Resolution</title>
    <link rel="stylesheet" href="node_modules/ol/ol.css">
    <style>
      .map {
        width: 100%;
        height: 400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="./resources/elm-pep.js"></script>
    <script type="module" src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "min-max-resolution",
  "dependencies": {
    "ol": "7.3.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}