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SURVEYS OF THE EARTH’S RESOURCES AND ENVIRONMENT BY SATELLITES

机译:卫星对地球资源与环境的调查

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Two of NASA's recent satellites have made very significant con-tributions to the systematic surveying of processes and phenom¬ena occurring on the surface of the earth. ERTS-1, which has operated almost flawlessly since August 1972, is providing registered, multispectral images of about 5 million square kilometers of the earth's surface every day. These images are being used to make thematic maps on scales of at least 1:250,000 almost instantly. They have been used for the assess¬ment of available water resources and for a nationwide survey of water impoundment. Maps of landforms and tectonic features made from ERTS images have demonstrated their utility in facilitating mineral and petroleum exploration, expecially in making such exploration more cost effective.

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