Abstract
We present the preliminary results of an optical-infrared survey spanning an area ∼30~deg^2 in the Orion OB1 association, across the off-cloud regions, where the young stellar populations are more evolved. The combination of a multi-epoch optical survey with a deep mapping in the near-infrared, opens a window into what we can expect of the new generation of large scale surveys like VISTA and LSST.
