hayden didn't have much to go on. >> most of what we had felt more like elvis sightings than intelligence. >> until u.s. intelligence zeroed in on that compound. >> an unusual compound, unusual in its security, unusual in its size and, frankly, unusual in its location. >> its location, a half a mile from pakistan's premier military academy in abbottabad. here in the operations center at the national geospatial intelligence agency, we move to activity resolution. >> translation, it's not just about satellite photos anymore. now the patterns of behavior they reveal are much more telling.