High Resolution Narrow Aperature Radar or Other???

[starsplitter]

A few years ago I saw what I remember as radar imagery of Yucatan rainforest (archeologists at work). The technology made long hidden even buried trails and buildings pop from beneath the canopy - the effect was astounding. Does anyone know the technology? Can you provide a link? Thank you.

 

[Produce Guy]

I saw this on PBS's Nova show,but I can't remember what it's called