I think the FBI Black Hawk Helicopter may be providing more than just "high resolution" photos. I think there camera will be able to tell you all locations where a decaying body could be found. Here are some articles regarding this technology:
http://kingstonprogressive.blogspot.com/2010/04/they-see-dead-people.html
http://facss.org/contentmgr/showdetails.php/id/37823
http://www.chem.info/News/Feeds/201...-detectives-know-where-the-bodies-are-buried/
A related method that is currently being developed by the FBI detects living humans, and recently dead bodies lying on the ground, by recognising the chemical signature of human skin. It could be used when trying to locate and rescue people who are lost or missing, and to track down fugitives.
Kerri Moloughney of the FBI Counterterrorism and Forensic Science Research Unit in Quantico, Virginia, and her colleagues fitted a helicopter with a hyperspectral camera covering visible and infrared wavelengths in the range 400 to 2350 nanometres to see whether skin signatures could be spotted from the air. They then flew it over a specially prepared site where human and animal remains at various stages of decomposition had been scattered on the ground, and where there were also a number of live human volunteers. The signals it picked up showed a clear distinction between living human skin and the skin of long-dead humans and animals.
Moloughney says the technique could be combined with visual aerial searches and thermal imaging to pinpoint individuals in a landscape. "We hope it will enable us to find so much more than we can currently," says Moloughney, who also presented her results at the AAFS.
Underground heat betrays decaying flesh
So much for stone cold dead. Writhing masses of maggots can raise the temperature of decaying flesh to around 30 °C - and that heat signature could provide a telling clue in the hunt for hidden corpses.
Ian Hanson at the University of Bournemouth, UK, and his colleagues have been using thermal imaging to help detect the bodies of deer carcasses laid out in light woodland. "In many dead bodies you've got a maggot mass of several kilograms feeding away inside, and they like it warm," says Hanson.
"The police view has been that once a body has reached the same temperature as its environment, you can't pick it up with infrared," says Hanson. But his team has now found that as the maggots congregate into a mass, they can raise the temperature inside deer carcasses to 28 to 30 °C. This takes around five days, depending the weather.
When maggots do colonise a body, the heat they generate can be detected by infrared cameras mounted on police helicopters, Hanson has found. This could provide a new tool for identifying bodies in the undergrowth. "Once the maggot mass has developed there's a window of opportunity to find the bodies again," says Hanson.