Hi guys,

the Map provides with the basic info via the extent() method and the Location class.

The requested functionality can be achieved by calculating the total distance (in m) visible across the map mid-line:

var extent = map.extent();
var center = map.center();

var eastCenter = new Location(center.lat, extent.nw.lng);
var westCenter = new Location(center.lat, extent.se.lng);
var distance = eastCenter.distanceTo(westCenter);

From there the map scale (m/px) is:

var width = map.element.width();
var scale = Math.round(distance / width);

You can see a runnable sample demonstrating this approach here:

http://dojo.telerik.com/@tsvetomir/ubiqO/

Regards,
Vessy
Progress Telerik