| Abstract: | The paper discusses aspects of air photography and electronic processes which produce imagery by infra-red radiation and by radar waves. After preliminary comments on lenses, laboratory techniques and colour photography, the author indicates certain advantages in simultaneous photography using black and white, infra-red and colour films. Moreover, information is given on simultaneous photography by satellite and the paper terminates with a resume of methods that are used to obtain imagery by infra-red radiation and by radar. |
