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WKB

发布于 2022-11-30 23:36:07 字数 2680 浏览 0 评论 0 收藏 0

Example of using the WKB parser.

Create features from geometries in WKB (Well Known Binary) format.

main.js

import 'ol/ol.css';
import Map from 'ol/Map';
import View from 'ol/View';
import WKB from 'ol/format/WKB';
import {OSM, Vector as VectorSource} from 'ol/source';
import {Tile as TileLayer, Vector as VectorLayer} from 'ol/layer';

const raster = new TileLayer({
  source: new OSM(),
});

const wkb =
  '0103000000010000000500000054E3A59BC4602540643BDF4F8D1739C05C8FC2F5284C4140EC51B81E852B34C0D578E926316843406F1283C0CAD141C01B2FDD2406012B40A4703D0AD79343C054E3A59BC4602540643BDF4F8D1739C0';

const format = new WKB();

const feature = format.readFeature(wkb, {
  dataProjection: 'EPSG:4326',
  featureProjection: 'EPSG:3857',
});

const vector = new VectorLayer({
  source: new VectorSource({
    features: [feature],
  }),
});

const map = new Map({
  layers: [raster, vector],
  target: 'map',
  view: new View({
    center: [2952104.0199, -3277504.823],
    zoom: 4,
  }),
});

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>WKB</title>
    <!-- Pointer events polyfill for old browsers, see https://caniuse.com/#feat=pointer -->
    <script src="https://unpkg.com/elm-pep"></script>
    <!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
    <script src="https://cdn.polyfill.io/v3/polyfill.min.js?features=fetch,requestAnimationFrame,Element.prototype.classList,URL,TextDecoder,Number.isInteger"></script>
    <style>
      .map {
        width: 100%;
        height:400px;
      }
    </style>
  </head>
  <body>
    <div id="map" class="map"></div>
    <script src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "wkb",
  "dependencies": {
    "ol": "7.1.0"
  },
  "devDependencies": {
    "parcel": "^2.0.0-beta.1"
  },
  "scripts": {
    "start": "parcel index.html",
    "build": "parcel build --public-url . index.html"
  }
}

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WKB

main.js

index.html

package.json

如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。