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Author Cottam, C.
Title (up) A shower of grebes Type Journal Article
Year 1929 Publication The Condor Abbreviated Journal
Volume 31 Issue 1 Pages 80-81
Keywords Animals; Birds
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Call Number GFZ @ kyba @ Serial 2424
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Author Pike, R.
Title (up) A Simple Computer Model for the Growth of Light Pollution. Type Journal Article
Year 1976 Publication Journal of the Royal Astronomical Society of Canada Abbreviated Journal
Volume 70 Issue Pages 116-126
Keywords Skyglow
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Call Number LoNNe @ kagoburian @ Serial 563
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Author Treanor, P. J.
Title (up) A simple propagation law for artificial night-sky illumination Type Journal Article
Year 1973 Publication The Observatory Abbreviated Journal
Volume 93 Issue Pages 117-120
Keywords Skyglow
Abstract The problem of locating new large astronomical observatories in sites which have a suitably dark night sky (artificial excess of the order of omi) is becoming increasingly difficult in Europe and the United States, on account of extensive urban development, the high luminous efficiency of modern discharge lighting, and the scattering of light in an atmosphere contaminated by aerosols. To investigate the artificial illumination of the sky over large regions on the basis of necessarily limited observations, one needs an expression for the zenith brightness produced by towns of known site and distance.

The exact derivation of such a law is exceedingly complex, involving the computation of the radiation transfer in an atmosphere with absorption, multiple scattering, and complicated physical and geometrical parameters. Notwithstanding these difficulties, it is possible to obtain a useful physical insight into the general form of this law by considering a very simplified model, consisting of a homogeneous atmosphere, in which vertical heights are small in relation to the horizontal distances between town and observatory, and which the scattering is limited to a cone of small angle whose axis lies in the direction of the incident beam. The limited scale height and optical thickness of the real atmosphere, and the forward-scattering characteristics of aerosols lend some plausibility to these simplifications.
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Call Number IDA @ intern @ Serial 2633
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Author Cao, X.; Hu, Y.; Zhu, X.; Shi, F.; Zhuo, L.; Chen, J.
Title (up) A simple self-adjusting model for correcting the blooming effects in DMSP-OLS nighttime light images Type Journal Article
Year 2019 Publication Remote Sensing of Environment Abbreviated Journal Remote Sensing of Environment
Volume 224 Issue Pages 401-411
Keywords Remote Sensing
Abstract Night-time light (NTL) data from the Defense Meteorological Satellite Program (DMSP) Operation Linescan System (OLS) provide important observations of human activities; however, DMSP-OLS NTL data suffer from problems such as saturation and blooming. This research developed a self-adjusting model (SEAM) to correct blooming effects in DMSP-OLS NTL data based on a spatial response function and without using any ancillary data. By assuming that the pixels adjacent to the background contain no lights (i.e., pseudo light pixels, PLPs), the blooming effect intensity, a parameter in the SEAM model, can be estimated by pixel-based regression using PLPs and their neighboring light sources. SEAM was applied to all of China, and its performance was assessed for twelve cities with different population sizes. The results show that SEAM can largely reduce the blooming effect in the original DMSP-OLS dataset and enhance its quality. The images after blooming effect correction have higher spatial similarity with Suomi National Polar-orbiting Partnership Visible Infrared Imaging Radiometer Suite (VIIRS) images and higher spatial variability than the original DMSP-OLS data. We also found that the average effective blooming distance is approximately 3.5 km in China, which may be amplified if the city is surrounded by water surfaces, and that the blooming effect intensity is positively correlated to atmospheric quality. The effectiveness of the proposed model will improve the capacity of DMSP-OLS images for mapping the urban extent and modeling socioeconomic parameters.
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ISSN 0034-4257 ISBN Medium
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Call Number GFZ @ kyba @ Serial 2239
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Author Birriel, J.; Adkins, J. K.
Title (up) A Simple, Portable Apparatus to Measure Night Sky Brightness at Various Zenith Angles Type Journal Article
Year 2010 Publication The Journal of the American Association of Variable Star Observers Abbreviated Journal
Volume 38 Issue Pages 221
Keywords Remote Sensing
Abstract We describe a simple apparatus for making measurements of night sky brightness as a function of zenith and azimuth using “off-the-shelf” equipment: a Unihedron Sky Quality Meter with Lens, a protractor with plumb-line, a tripod, and a hand-held compass. Compared to a photoelectric or CCD photometric system, this apparatus is simple to set up and use and does not require complex data reduction procedures. Thus, this apparatus makes measurements of night sky brightness as a function of zenith and azimuthal angles quite amenable to students.
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Call Number LoNNe @ kagoburian @; IDA @ john @ Serial 905
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