Once they were gone, any movement back could be easily detected by aerial surveillance.

I turn my thoughts toward ways other than aerial surveillance to accomplish this.

The convoy was to remain under aerial surveillance for the next six days.

"We've got the aerial surveillance photos and a working model.

The problem of U-2 aerial surveillance has been resolved.

A navy aerial surveillance component is a necessary part of the defence system"

The government stepped up its efforts to enhance maritime security through aerial surveillance.

Stationed in England, he was part of team that would analyze aerial surveillance for military intelligence.

"We've already got ground and aerial surveillance on the park," Scorse contributed.

The main tasks of the aerial surveillance aircraft are to:

With aerial surveillance, ground units wouldn't have to follow closely to stay up with us.

But aerial surveillance shows that the bloom already covers sixty thousand square miles.

Any information gained from aerial surveillance would have to be made available to other signatory countries on request.

As police plans for increasing unmanned aerial surveillance take shape, there is a new twist.

The MD-500 is a highly effective aerial surveillance platform in border areas.

Officials said the most recent aerial surveillance showed an oil slick spread intermittently in an area of 270 to 300 square miles.

Aerial surveillance could be tricky sometimes, and tiny details were sometimes missed.

They were all but invisible to aerial surveillance.

With the threat of aerial surveillance reduced, Sean decided to resume daylight travel.

Federal environmental officials discovered the radioactive hot spots through aerial surveillance, and the state began a demonstration removal project in 1985.

Overhead, two bright yellow aircraft circled, one following the other in an aerial surveillance focused on those of us down below.

Higgins would likely have the police at his disposal; road cameras, patrol cars, aerial surveillance.

Thinking back to their aerial surveillance, the warrior recalled the position of the mountain relative to both the pipeline and the village.

June Cicero's body was discovered by aerial surveillance on January 3, 1990.

The new aerial surveillance effort focused on the southern U.S. border.