Yes, I am familiar with this technology. It's called Pictrometry(TM). Aircraft fly multiple overlapping flightlines over an area while multiple digital cameras image the area below from a variety of different angles, both straight down and oblique. GPS, SINS, and other navigational technologies allow this data to be integrated in such a way that a three dimensional visual database of the ground and vertical structures and features on it can be reconstructed using image perspective transformation algorithms.. All you need is to specify an arbitrary point and a direction in space and it will give you a geometrically correct image of what it would look like if you were at that point, viewing in that direction.

A possible application that was pointed out to me during a demo of this technology was as follows:

A major sporting event is planned at your local stadium. Pictrometry can be used to determine angles, distances, views, etc. Can a sniper placed here see someone seated there? How high is this fence in case the SWAT team has to jump over it to get there? Will this alley allow a fire engine to get through? How far is it from home plate to that spot on the scoreboard the fly ball hit? A complete and accurate geometrical reconstruction of a scene can be generated for forensic or training purposes (this is what you'll see when you come around that streetcorner). Some of my colleagues thought this was all very sinister, I disagreed, I just felt it had limited applications for it's enormous costs.
Like much modern technology today, it is technically brilliant, but has an extravagant cost/benefit ratio. My guess is this would be a great tool for planning and training for a commando raid in hostile territory, but it is being marketed primarily to municipal agencies as a high-tech substitute for traditional photogrammetric methods. In my opinion, it's a solution looking for a problem.