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Author |
Cinzano, P.; Falchi, F. |
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Title  |
A portable wide-field instrument for mapping night sky brightness automatically |
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Journal Article |
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Year |
2003 |
Publication |
Memorie della Società Astronomica Italiana |
Abbreviated Journal |
Mem. S.A. It. |
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Volume |
74 |
Issue |
2 |
Pages |
458-459 |
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Keywords |
Instrumentation; all-sky; photometry; sky brightness |
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Abstract |
We present a portable automatic instrument for monitoring night sky brightness and atmospherical transparency in astronomical photometrical bands. Main requirements were: fast and automatic coverage of the entire sky, lightness, transportability and quick set-up in order to take measurements from more sites in the same night, easily available commercial components and software to be reproduced by any interested institution, included amateurs astronomers groups. |
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Istituto di Scienza e Tecnologia dell’Inquinamento Luminoso, Thiene, Italy |
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Società Astronomica Italiana |
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English |
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English |
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1824-016X |
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IDA @ john @ |
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2243 |
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Author |
Karling, J.S. |
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Title |
A Preliminary Account of the Influence of Light and Temperature on Growth and Reproduction in Chara fragilis |
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Journal Article |
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Year |
1924 |
Publication |
Bulletin of the Torrey Botanical Club |
Abbreviated Journal |
Bulletin of the Torrey Botanical Club |
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Volume |
51 |
Issue |
12 |
Pages |
469 |
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Keywords |
Plants |
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0040-9618 |
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GFZ @ kyba @ |
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2404 |
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Author |
Li, X.; Li, X.; Li, D.; He, X.; Jendryke, M. |
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Title |
A preliminary investigation of Luojia-1 night-time light imagery |
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Journal Article |
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Year |
2019 |
Publication |
Remote Sensing Letters |
Abbreviated Journal |
Remote Sensing Letters |
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Volume |
10 |
Issue |
6 |
Pages |
526-535 |
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Keywords |
Remote Sensing; Instrumentation |
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Abstract |
Launched on 2 June 2018, Luojia-1 satellite records night-time light imagery at 130 m resolution, which is higher than most of the existing night-time light images to date. This study evaluated radiometric and spatial properties of the Luojia-1 satellite imagery for cities of Los Angeles, Wuhan and Rome as well as the change detection capability for Zunyi city. For the radiometric property, the analysis shows that the Luojia-1 images correlate well with the radiance of the Visible Infrared Imaging Radiometer Suite (VIIRS)’s Day and Night Band (DNB), and that the Luojia-1 images have a wider range of radiance values, as well as higher radiance values (e.g., 40%–90% higher) than the VIIRS DNB images. Using wavelet decomposition and change detection analysis to evaluate spatial property and change detection capability, it was found that the Luojia-1 images provide abundant spatial detail information, with about 20%–54% energy of wavelet component of the images stored in 100–400 m resolutions, and they can help to track the electrification of new roads and buildings at a fine resolution. This study shows that the Luojia-1 images are an effective data source for analysing spatiotemporal distribution of night-time light and its associated socioeconomic attributes. |
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2150-704X |
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GFZ @ kyba @ |
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2199 |
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Author |
Nam, K. H., Kim, C. H., & Nam, K. H. |
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Title |
A Research on the Improvement of Visibility Using Low Deck Lighting in Bad Weather |
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Journal Article |
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Year |
2020 |
Publication |
Journal of the Korean Institute of Electrical and Electronic Material Engineers |
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33 |
Issue |
3 |
Pages |
186-193 |
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Keywords |
Lighting |
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We investigate a fog-detection CCT control system using low deck lighting as a solution to the forward visibility of pole-type street lamps employed on existing roads. The lighting standards were met with a light source that has less compared with those of pole-type street lamps. The results show that the transmission rate was increased by changing the color temperature by automatically recognizing fog in bad weather and minimizing the phenomenon of lighting. In addition, it was allowed to create a safer and more comfortable driving environment for drivers owing to flicker or light pollution of existing pole-type street lamps. As a result, if lighting is used at a lower level than pole-type street lamps, the accident rate caused by securing the driver's forward visibility can be reduced sharply and existing problems can be resolved. |
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IDA @ intern @ |
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2953 |
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Author |
Kocifaj, M.; Kómar, L. |
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Title |
A role of aerosol particles in forming urban skyglow and skyglow from distant cities |
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Journal Article |
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Year |
2016 |
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Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
MNRAS |
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Volume |
458 |
Issue |
1 |
Pages |
438-448 |
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Keywords |
Skyglow; scattering; atmospheric effects; artificial light; numerical modeling; GIS-based modeling; light pollution |
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Abstract |
Aerosol particles may represent the largest uncertainty about skyglow change in many locations under clear sky conditions. This is because aerosols are ubiquitous in the atmosphere and influence the ground-reaching radiation in different ways depending on their concentrations, origins, shapes, sizes, and compositions. Large particles tend to scatter in Fraunhofer diffraction regime, while small particles can be treated in terms of Rayleigh formalism. However, the role of particle microphysics in forming the skyglow still remains poorly quantified. We have shown in this paper that the chemistry is somehow important for backscattering from large particles that otherwise work as efficient attenuators of light pollution if composed of absorbing materials. The contribution of large particles to the urban skyglow diminishes as they become more spherical in shape. The intensity of backscattering from non-absorbing particles is more-or-less linearly decreasing function of particle radius even if number size distribution is inversely proportional to the fourth power of particle radius. This is due to single particle backscattering that generally increases steeply as the particle radius approaches large values. Forward scattering depends on the particle shape but is independent of the material composition, thus allowing for a simplistic analytical model of skyglow from distant cities. The model we have developed is based on mean value theorem for integrals and incorporates the parametrizable Garstang's emission pattern, intensity decay along optical beam path, and near-forward scattering in an atmospheric environment. Such model can be used by modellers and experimentalists for rapid estimation of skyglow from distant light sources. |
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ICA, Slovak Academy of Sciences, Dúbravská Road 9, 845 03 Bratislava, Slovak Republic; kocifaj(at)savba.sk |
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Oxford Journals |
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English |
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IDA @ john @ |
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1361 |
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