等高线

import { LineLayer, Scene } from '@antv/l7';
import { GaodeMap } from '@antv/l7-maps';

const scene = new Scene({
  id: 'map',
  map: new GaodeMap({
    pitch: 53.6305,
    style: 'light',
    center: [102.600579, 23.114887],
    zoom: 13.5,
  }),
});
scene.on('loaded', () => {
  fetch('https://gw.alipayobjects.com/os/rmsportal/ZVfOvhVCzwBkISNsuKCc.json')
    .then((res) => res.json())
    .then((data) => {
      const layer = new LineLayer({})
        .source(data)
        .size('ELEV', (h) => {
          return [h % 50 === 0 ? 1.0 : 0.5, (h - 1400) * 20];
        })
        .shape('line')
        .scale('ELEV', {
          type: 'quantize',
        })
        .style({
          heightfixed: true,
        })
        .color(
          'ELEV',
          [
            '#E4682F',
            '#FF8752',
            '#FFA783',
            '#FFBEA8',
            '#FFDCD6',
            '#EEF3FF',
            '#C8D7F5',
            '#A5C1FC',
            '#7FA7F9',
            '#5F8AE5',
          ].reverse(),
        );
      scene.addLayer(layer);
    });
});