[OpenLayers-Dev] measurement

[ibrahim saricicek]

Hi all,

I'm using spherical and cartesian measurements,
Why i'm getting so different results?


Code;

function calcVincenty(geometry)
    {
        var dist = 0;
        for (var i = 1; i < geometry.components.length; i++) {
            var first = geometry.components[i-1];
            var second = geometry.components[i];

            first_ll =
OpenLayers.Layer.SphericalMercator.inverseMercator(first.x, first.y);
            second_ll =
OpenLayers.Layer.SphericalMercator.inverseMercator(second.x, second.y);

            dist += OpenLayers.Util.distVincenty(
                                    {lon: first_ll.lon, lat: first_ll.lat},
                                    {lon: second_ll.lon, lat: second_ll.lat}
            );
        }
        return dist;
    }

    function handleMeasurements(event)
    {
        var geometry = event.geometry;
        var units = event.units;
        var order = event.order;
        var measure = event.measure;
        var element = document.getElementById('output');
        var out = "";
        if(order == 1) {
            out += cartesian + " : " + measure.toFixed(3) + " " + units;
            out += "<br />" + spherical + " : " +
            calcVincenty(geometry).toFixed(3) + " km ";
        }
        else
        {
            out += area + " : " + measure.toFixed(3) + " " + units +
"<sup>2</" + "sup>";
        }
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