OpenLayers示例代码：OpenStreetMap的投影与scaleline控制
OpenLayers示例代码：OpenStreetMap的投影与scaleline控制
<!DOCTYPE html>
<html>
<head>
<title>OpenStreetMap Reprojection with ScaleLine Control</title>
<link rel="stylesheet" href="https://openlayers.org/en/v4.0.1/css/ol.css" type="text/css">
<!-- The line below is only needed for old environments like Internet Explorer and Android 4.x -->
<script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL"></script>
<script src="https://openlayers.org/en/v4.0.1/build/ol.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/proj4js/2.3.15/proj4.js"></script>
</head>
<body>
<div id="map" class="map"></div>
<script>
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]]');
var map = new ol.Map({
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
})
],
target: 'map',
view: new ol.View({
projection: 'Indiana-East',
center: ol.proj.fromLonLat([-85.685, 39.891], 'Indiana-East'),
zoom: 7,
extent: ol.proj.transformExtent([-172.54, 23.81, -47.74, 86.46],
'EPSG:4326', 'Indiana-East'),
minZoom: 6
})
});
map.addControl(new ol.control.ScaleLine({units: 'us'}));
</script>
</body>
</html>
说明：
OpenLayers示例代码：OpenStreetMap的投影与scaleline控制
