Home/ Questions/Q 7973695
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-06-04T08:10:41+00:00

I have the following code. How to convert lonlat value to GPS used values

  • 0

I have the following code. How to convert lonlat value to GPS used values in degrees?

UPDATE: I’m not sure that I use correct vocabulary, but currently lonlat is equal to something like this ‘2698.98978 1232.8998’. I want to conver to degrees, e.g. ‘41.2987 2.1989’.

lonlat is a variable. Please see in the code.

<html>
 <head>
 <script src="http://openlayers.org/api/OpenLayers.js"></script>
 <script type="text/javascript"> 
    function init(){
      map = new OpenLayers.Map('map');
      base_layer = new OpenLayers.Layer.WMS( "OpenLayers WMS",
      "http://labs.metacarta.com/wms/vmap0", {layers: 'basic'} );
      map.addLayer(base_layer);
      map.zoomToMaxExtent();
      map.events.register('click', map, handleMapClick);
    } 

    function handleMapClick(evt)
    {
       var lonlat = map.getLonLatFromViewPortPx(evt.xy);
       // use lonlat
       alert(lonlat);
    } 
 </script>
 </head>
 <body onload="init()">
  Hello Map.<br />
 <div id="map"></div>
 </body>
</html>
Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    You shouldn’t use the getLonLatFromViewPortPx but the getLonLatFromPixel method like this:

    var lonlat = map.getLonLatFromPixel(evt.xy);

    This will give you the correct coordinates without any transforms.

    • 0