OpenStreetMap Reprojection with ScaleLine Control

reprojection 8 projection 13 openstreetmap 22 nad83 1 tile 9 scaleline 2

Demonstrates client-side reprojection of OpenStreetMap to NAD83 Indiana East.

This example shows client-side reprojection of OpenStreetMap to NAD83 Indiana East, including a ScaleLine control with US units.

main.js

import Map from 'ol/Map.js';
import OSM from 'ol/source/OSM.js';
import TileLayer from 'ol/layer/Tile.js';
import View from 'ol/View.js';
import proj4 from 'proj4';
import {ScaleLine} from 'ol/control.js';
import {fromLonLat, transformExtent} from 'ol/proj.js';
import {register} from 'ol/proj/proj4.js';

proj4.defs(
  'Indiana-East',
  'PROJCS["IN83-EF",GEOGCS["LL83",DATUM["NAD83",' +
    'SPHEROID["GRS1980",6378137.000,298.25722210]],PRIMEM["Greenwich",0],' +
    'UNIT["Degree",0.017453292519943295]],PROJECTION["Transverse_Mercator"],' +
    'PARAMETER["false_easting",328083.333],' +
    'PARAMETER["false_northing",820208.333],' +
    'PARAMETER["scale_factor",0.999966666667],' +
    'PARAMETER["central_meridian",-85.66666666666670],' +
    'PARAMETER["latitude_of_origin",37.50000000000000],' +
    'UNIT["Foot_US",0.30480060960122]]',
);
register(proj4);

const map = new Map({
  layers: [
    new TileLayer({
      source: new OSM(),
    }),
  ],
  target: 'map',
  view: new View({
    projection: 'Indiana-East',
    center: fromLonLat([-85.685, 39.891], 'Indiana-East'),
    zoom: 7,
    extent: transformExtent(
      [-172.54, 23.81, -47.74, 86.46],
      'EPSG:4326',
      'Indiana-East',
    ),
    minZoom: 6,
  }),
});

map.addControl(new ScaleLine({units: 'us'}));

index.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>OpenStreetMap Reprojection with ScaleLine Control</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>

    <script type="module" src="main.js"></script>
  </body>
</html>

package.json

{
  "name": "scaleline-indiana-east",
  "dependencies": {
    "ol": "9.1.0",
    "proj4": "2.10.0"
  },
  "devDependencies": {
    "vite": "^3.2.3"
  },
  "scripts": {
    "start": "vite",
    "build": "vite build"
  }
}