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wms.html
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<DOCTYPE html>
<html lang='en'>
<head>
<meta charset='utf-8' />
<title>My OpenLayers Map</title>
<script type='text/javascript' src='/OpenLayers-2.12/OpenLayers.js'></script>
<script type='text/javascript'>
var map;
function init() {
// Setup our map object
map = new OpenLayers.Map('map_element', {});
// Setup our two layer objects
var wms_layer_map = new OpenLayers.Layer.WMS(
'Base layer',
'http://vmap0.tiles.osgeo.org/wms/vmap0',
{layers: 'basic'},
{isBaseLayer: true}
);
// Add an overlay layer. We set the transparent property to true
// in the WMS parameters so it doesn't cover up the base layer
var wms_layer_labels = new OpenLayers.Layer.WMS(
'Location Labels',
'http://vmap0.tiles.osgeo.org/wms/vmap0',
{layers: 'clabel,ctylabel,statelabel',
visibility: false, transparent: true},
{opacity: .5}
);
// Add layers to the map
map.addLayers([wms_layer_map, wms_layer_labels]);
// Add a layer switcher control
map.addControl(new OpenLayers.Control.LayerSwitcher({}));
// Zoom the map to the max extent
if(!map.getCenter()){
map.zoomToMaxExtent();
}
}
</script>
</head>
<body onload='init();'>
<div id='map_element' style='width: 500px; height: 500px;'>
</div>
</body>
</html>