We won't know the exact dimensions of the fallout zone until aerial surveys are conducted.

MacMillan flew aerial surveys of the site, then used for market gardening.

The railway's route was chosen after two aerial surveys and comparisons of numerous possible alternatives.

The 1950 aerial survey appears to show that the loch had been drained to the point where no open water was present.

The 1950 aerial survey appears to show that the loch had been drained with only a small area of open water present.

However, in 1992, the reunified German government ordered aerial surveys of all state-owned land.

Even aerial surveys are limited in the amount of land that can realistically be observed at any one time.

A 1998 aerial survey showed that there are presently more than 127,000 seals living in British Columbia's waters.

The numbers are considered estimates because aerial surveys cannot count seals in the water.

An aerial photographic survey of 50 glaciers in the South Island has been carried out for most years since 1977.