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Fisheye lens view of cloud cover

Fisheye lens view of cloud cover

E120/0394

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26.6 MB (1.5 MB compressed)

3543 x 2621 pixels

30.0 x 22.1 cm ⏐ 11.8 x 8.7 in (300dpi)

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Credit

PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY PEKKA PARVIAINEN / SCIENCE PHOTO LIBRARY

Caption

Cloud cover assessment. Fisheye lens view of the whole sky, showing the amount of cloud cover made up by cumulus clouds. Use of a lens with orthographic projection (OP) allows an assessment of the percentage cloud cover to be made. An OP lens is one where the elevation angle of the object is directly proportional to its distance from the centre of the image. By pointing such a lens with a focal length of 8mm vertically upward, a complete, all-round view of the sky may be obtained. The percentage of the image covered by cloud is directly related to the percentage cloud cover used in forecasting and weather reporting.

Release details

Model release not required. Property release not required.

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