[OpenLayers-Users] Measure tool is giving me the wrong results

[Robert Buckley]

Hi,

I have created a map which uses the following code to get linear measurements.


var length = new OpenLayers.Control.Measure(OpenLayers.Handler.Path, {
    eventListeners: {
        measure: function(evt) {
            Ext.MessageBox.show(
            {title: 'Length'
            ,buttons: Ext.MessageBox.OK
            ,width:200
            ,msg:"Length: " +evt.measure + evt.units,
            fn: check
            });
                                    }
                    }
        });



I am using geoext to present the map.

The data is transformed using this.


var epsg4326 = new OpenLayers.Projection("EPSG:4326");
    var epsg900913 = new OpenLayers.Projection("EPSG:900913");


var mapCenter = new OpenLayers.LonLat(1169180, 6843865);
    mapCenter.transform(epsg4326, epsg900913);
    map.setCenter(mapCenter, 9); 

Could anyone shed some light on why the measurements are drastically wrong. 
They 
are inaccurate to about 15 meters/ km over small distances


Yours,

Robert



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