Like Ms Parcak, she identified sites from satellite photographs and then dated them by visiting them.
Although a woodland's area can be worked out from satellite photographs, that gives only a hazy idea of the mass of the plants growing there.
They compared the cosmic-ray flux with the proportion of the world's skies obscured by cloud, a figure that has been available from satellite photographs since 1979.
He demonstrated its reach by showing on-screen the change in the ecology of the Tigris-Euphrates basin in southern Iraq, as recorded by satellite photographs, from 1973 to 2000.
The book uses satellite photographs of Earth, as well as detailed charts and diagrams, to illustrate how the planet is changing from the destruction of the Aral Sea to the spread of pollutants.
Besides the usual panoply of search-and-rescue aircraft deployed by America's Civil Air Patrol, which wound down its search on September 17th, a different sort of search effort is being conducted online, using satellite photographs.
Satellite photographs are said to show thousands of workers digging into a mountainside near Yongbyon, the site of a North Korean nuclear reactor which has been frozen under an agreement with the United States.
Inspectors are still at work in Iran: this week they took samples at what the government admits is a military site (though not a nuclear one), called Lavizan, in Tehran, where recent satellite photographs showed that buildings had been demolished and topsoil carted away.
ECONOMIST: The Europeans' soft approach to Iran seems to have failed
Moreover, Shaw describes the incident in the context of a larger Baathist Iraqi effort to hide powerful arms by moving them to Syria, Lebanon, and possibly Iran - an account bolstered by satellite photographs released Thursday showing truck convoys at several weapons sites in the weeks before U.S. military operations were launched.
The web's links now encompass computer-science technical reports, folk-song lyrics, economic statistics from America's Department of Commerce, tarot cards, satellite weather photographs, film reviews, legal databases, the Bible, library catalogues, literary magazines and more.
Apart from the obligatory satellite dishes and computers Clarke's home is decorated with photographs of him next to the Pope, the Apollo astronauts and Steven Spielberg.
In the past, the United States government has been willing to declassify the high-resolution photographs taken by the SR-71 when it felt constrained from revealing the products of satellite collection systems.
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