NASA says researchers in California have developed a method to use specialized 3-D imaging radar to do those classifications quickly. And because the radar can be mounted on a plane, it can be deployed quickly and stay in place over the spill longer. Researchers at the Jet Propulsion Laboratory and California Institute of Technology proved their theory by using three radar deployments over the Deepwater Horizon spill on June 21-22, 2010. The radar, developed at JPL, was mounted beneath a NASA C-20 piloted plane, a version of the Gulfstream III business jet. How sophisticated is the radar? It can tell the difference between a sheen of oil (0.005 millimeters to 0.05 millimeters thick) to an emulsion (1 millimeter thick). The thicker emulsions stay on the surface longer and can do much more environmental damage.