Example of OpenLayers to see measurements beside the cursor

Demonstrates the dynamic measure control to measure and see measurements beside the cursor.

navigate
measure distance
measure area
Segments to display (leave blank for all)
show segments length
show the area perimeter length
show segments heading
use geodesic:true

Measure the bridge in the center of the mapExtent. The real length of the bridge is between 24 and 25 meters.
Without geodesic:true you get a wrong measurement! Hint from Andreas Hocevar: Geodesic calculation works the same in both the ScaleLine and Measure controls, so it has the same prerequisites. The advice that proj4js is needed to make it work is only true to the extent it is with any reprojection in OpenLayers: as long as your map is in EPSG:900913, you don't need proj4js. As soon as you use a different projection, you need it. http://osgeo-org.1560.x6.nabble.com/Getting-the-right-results-from-Measure-tool-using-EPSG-3776-tp3921884p3921894.html

OpenLayers Measure Example