ERTS - NASA's Earth Resources Technology Satellite - uses remote sensing to provide information about features of the Earth's surface. This film, which commences with a view of the whole Earth from space and images from the Gemini and Apollo programmes, may be summarised as follows: rocket launch from the Western Test Range in California, July 23rd 1972; animation of ERTS-1; various views of the Earth from space, cut with terrestrial footage of equivalent areas; expert explains areas on remote-sensing photograph; explanation [graphics] of the workings of ERTS-1, and its flightpath; Goddard Spaceflight Centre, monitoring at operations centre; conversion of annotated data to film negative, development of film at photo lab; analysis of remote-sensed photographs; interpretive technique - adding colour, thematic mapping [isolation of individual elements]; various shots of scientists at the University of Wyoming, along with natural resources of Wyoming itself; NASA C-130 remote sensing plane, along with images pro

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