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Scale bar provides a visual indication of the size of features, and distance between features, on the map. A scale bar is a line or bar divided into parts. It is labeled with its ground length, usually in multiples of map units, such as tens of kilometers or hundreds of miles.
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How accurate is the Scale Line in OpenLayers
Is there any source describing the accuracy of OpenLayer's scale line?
You can get an scale line by using the constructor:
map.addControl(new OpenLayers.Control.ScaleLine());
However, it seems to b …