Even if you don't normally visit Gizmodo, go read this article

This is one of the most impressive results of ground-penetrating radar (GPR) I’ve seen to date.

Automated processing of imagery is becoming more widely available. Visual processing led to neat projects like Photosynth and now several companies offer software which can build 3-D models from imagery.

Supervised processing of LiDAR has been available for quite some time now, but to see it finally cross over into GPR is really neat. It won’t be long before we can combine photos, LiDAR and GPR into a fully-interactive 3-D environment.