Can anyone tell me the main difference between OpenLayers 2 and OpenLayers 3?

In other words, what are the main features in OpenLayers 3?

  • It's more than the features that have changed, the entire framework is redesigned. – nagytech Jul 8 '15 at 6:54

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.

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