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| Titel |
Quantification of atmospheric visibility with dual digital cameras during daytime and nighttime |
| VerfasserIn |
K. Du, K. Wang, P. Shi, Y. Wang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 6, no. 8 ; Nr. 6, no. 8 (2013-08-27), S.2121-2130 |
| Datensatznummer |
250085043
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| Publikation (Nr.) |
 copernicus.org/amt-6-2121-2013.pdf |
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| Zusammenfassung |
| A digital optical method "DOM-Vis" was developed to measure atmospheric
visibility. In this method, two digital pictures were taken of the same
target at two different distances along the same straight line. The pictures
were analyzed to determine the optical contrasts between the target and its
sky background and, subsequently, visibility is calculated. A light transfer
scheme for DOM-Vis was delineated, based upon which algorithms were
developed for both daytime and nighttime scenarios. A series of field tests
were carried out under different weather and meteorological conditions to
study the impacts of such operational parameters as exposure, optical zoom,
distance between the two camera locations, and distance of the target. This
method was validated by comparing the DOM-Vis results with those measured
using a co-located Vaisala® visibility meter. The visibility
under which this study was carried out ranged from 1 to 20 km. This
digital-photography-based method possesses a number of advantages compared
with traditional methods. Pre-calibration of the detector with a visibility
meter is not required. In addition, the application of DOM-Vis is
independent of several factors like the exact distance of the target and
several camera setting parameters. These features make DOM-Vis more adaptive
under a variety of field conditions. |
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