aerial observation

It is the first battle in history to be affected by aerial observation.

That order is to prevent all enemy aerial observation over our lines.

Despite the total lack of natural foliage, or local buildings, the company is well hidden from ground and aerial observation.

"Not against targets in the forest, unless they had very good aerial observation," Ryder said.

The school used balloons and fixed wing aircraft for aerial observation.

"And by using the gully he makes aerial observation extremely difficult," Blade noted.

A good rain would not only protect him from aerial observation, but could eliminate any chance of his running out of water.

Surrounding terrain can be surveyed with aerial observation units and radar.

These winds created much havoc with the aerial observation, ground training, and balloon handling.

These were full-leaved enough in places to form fairly secure screens against aerial observation.

Dense tropical rain forest covers the entire area, almost frustrating aerial observation.

When first reported in 1983 after aerial observation, it was interpreted as either an impact structure or a cryptovolcanic feature.

The ground survey was facilitated by aerial photographs and aerial observations.

About 10 such balloon tenders were built with their main objective being aerial observation posts.

Unexplained aerial observations have been reported throughout history.

Then they all quickly shoved as much of the mud as possible onto the car to conceal it from aerial observation.

"They'll shelter you from any accidental aerial observation."

It was the sort of camouflage a man would wear to hide from aerial observation, not from observers on the ground.

But he would have had to hide his sled from aerial observation, as Moksoon had done.

The mountains also serve as screens, and the clouds frequently trapped by the peaks hid them from aerial observation.

With pressure building during the first day of the attack, aerial observation reported a strong regimental size element moving towards Bannstein.

During the 1930s, Brooks was the center of aerial observation activity and several units were trained in tactical observation.

Aerial observation was hazardous work as, for best results, the aircraft had to fly at slow speeds and low altitude over the German defences.

The power of aerial observation and attack led every warring nation to camouflage targets of all types.

"On our way here, Sir, we conducted as much of an aerial observation as we could from the aircraft.