Can anyone tell me the main difference between OpenLayers 2 and OpenLayers 3?
In other words, what are the main features in OpenLayers 3?
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The features of OpenLayers 3, which distinguish it from OpenLayers 2, seem to be described in a blog post entitled Hot new features in OpenLayers 3:
It makes heavy use of the new capabilities of modern Web browsers (Canvas, WebGL) and opens a whole new world of possibilities like client-side vector rendering, integration of 3D data, and many more.
I recommend reviewing the blog posting rather than just the brief summary above.