Satellite Tandems

The article speaks about the advantages to taking satellite pictures of the same location, by two satellites, separated by only minutes...

By combining two or more SAR images of the same site, slight alterations that may have occurred between acquisitions can be detected. This technique, known as SAR interferometry or InSAR, has proven to be very useful for applications such as glacier monitoring, surface deformation detection and terrain mapping. This short time separation allows for changes that occur quickly to be detected. Fast-moving glaciers, for instance, move more than 200 m per year and can move as much as 1 cm in 30 minutes. The ability to detect these small changes occurring on the ground between acquisitions is also allowing scientists to understand better and improve the quality of the SAR interferometry technique.

Is this article saying we can discern movement in the 1 centimeter range from satellites?  Even if close to true, "what hath God wrought?"  

While my Old Lady was out of town the other day, I peeked over the fence and, sight for sore eyes,  there lay a foxy bitch - naked! sunning on the back porch!  I barked till I thought I would go crazy.   But, what with those satellites flying over at who knows when, taking pictures that might fall into the wrong paws, maybe I should turn my butt toward temptation while barking? That'd throw the Old Lady off!  She would think I was barking at our house!

Pooch Doggy Dog

http://www.sciencedaily.com/releases/2008/12/081203133821.htm

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