| Records |
Author  |
Dobler, G.; Ghandehari, M.; Koonin, S.E.; Sharma, M.S. |
| Title |
A Hyperspectral Survey of New York City Lighting Technology |
Type |
Journal Article |
| Year |
2016 |
Publication |
Sensors (Basel, Switzerland) |
Abbreviated Journal |
Sensors (Basel) |
| Volume |
16 |
Issue |
12 |
Pages |
2047 |
| Keywords |
Remote Sensing; Instrumentation; Lighting |
| Abstract |
Using side-facing observations of the New York City (NYC) skyline, we identify lighting technologies via spectral signatures measured with Visible and Near Infrared (VNIR) hyperspectral imaging. The instrument is a scanning, single slit spectrograph with 872 spectral channels from 0.4-1.0 mu m. With a single scan, we are able to clearly match the detected spectral signatures of 13 templates of known lighting types. However, many of the observed lighting spectra do not match those that have been measured in the laboratory. We identify unknown spectra by segmenting our observations and using Template-Activated Partition (TAP) clustering with a variety of underlying unsupervised clustering methods to generate the first empirically-determined spectral catalog of roughly 40 urban lighting types. We show that, given our vantage point, we are able to determine lighting technology use for both interior and exterior lighting. Finally, we find that the total brightness of our scene shows strong peaks at the 570 nm Na – II , 595 nm Na – II and 818 nm Na – I lines that are common in high pressure sodium lamps, which dominate our observations. |
| Address |
NYU Center for Urban Science and Progress, 1 MetroTech Center, Brooklyn, NY 11201, USA. mohit.sharma@nyu.edu |
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English |
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1424-8220 |
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PMID:27929391 |
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| Call Number |
LoNNe @ kyba @ |
Serial |
1567 |
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| Author |
Downey, J.W. |
| Title |
Determination of minimum light sense and retinal dark adaptation with presentation of a new type of photometer |
Type |
Journal Article |
| Year |
1919 |
Publication |
American Journal of Ophthalmology |
Abbreviated Journal |
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| Volume |
2 |
Issue |
1 |
Pages |
13-20 |
| Keywords |
Vision; Instrumentation |
| Abstract |
This paper reviews the principal hypotheses with reference to light and dark adaptation, and suggests a practical photometer, using a radioactive substance as a standard of comparison. With three illustrations, and experimental findings with this instrument. |
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GFZ @ kyba @ |
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2418 |
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| Author |
Duriscoe, D.M. |
| Title |
Photometric indicators of visual night sky quality derived from all-sky brightness maps |
Type |
Journal Article |
| Year |
2016 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
JQSRT |
| Volume |
181 |
Issue |
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Pages |
33-45 |
| Keywords |
Skyglow; Instrumentation |
| Abstract |
Wide angle or fisheye cameras provide a high resolution record of artificial sky glow, which results from the scattering of escaped anthropogenic light by the atmosphere, over the sky vault in the moonless nocturnal environment. Analysis of this record yields important indicators of the extent and severity of light pollution. The following indicators were derived through numerical analysis of all-sky brightness maps: zenithal, average all-sky, median, brightest, and darkest sky brightness. In addition, horizontal and vertical illuminance, resulting from sky brightness were computed. A natural reference condition to which the anthropogenic component may be compared is proposed for each indicator, based upon an iterative analysis of a high resolution natural sky model. All-sky brightness data, calibrated in the V band by photometry of standard stars and converted to luminance, from 406 separate data sets were included in an exploratory analysis. Of these, six locations representing a wide range of severity of impact from artificial sky brightness were selected as examples and examined in detail. All-sky average brightness is the most unbiased indicator of impact to the environment, and is more sensitive and accurate in areas of slight to moderate light pollution impact than zenith brightness. Maximum vertical illuminance provides an excellent indicator of impacts to wilderness character, as does measures of the brightest portions of the sky. Zenith brightness, the workhorse of field campaigns, is compared to the other indicators and found to correlate well with horizontal illuminance, especially at relatively bright sites. The median sky brightness describes a brightness threshold for the upper half of the sky, of importance to telescopic optical astronomy. Numeric indicators, in concert with all-sky brightness maps, provide a complete assessment of visual sky quality at a site. |
| Address |
U.S. National Park Service, Natural Sounds and Night Skies Division, 351 Pacu Lane, Bishop, CA 93514, USA; dan_duriscoe(at)nps.gov |
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Elsevier |
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English |
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English |
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0022-4073 |
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no |
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LoNNe @ kyba @ ; IDA @ john @ |
Serial |
1376 |
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| Author |
Elvey, C.T.; Roach, F.E. |
| Title |
A Photoelectric Study of the Light from the Night Sky |
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Journal Article |
| Year |
1937 |
Publication |
The Astrophysical Journal |
Abbreviated Journal |
ApJL |
| Volume |
85 |
Issue |
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Pages |
213 |
| Keywords |
Instrumentation; Sky Brightness |
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0004-637X |
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no |
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GFZ @ kyba @ |
Serial |
2399 |
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| Author |
Fiorentin, P.; Boscaro, F. |
| Title |
A method for measuring the light output of video advertising reproduced by LED billboards |
Type |
Journal Article |
| Year |
2019 |
Publication |
Measurement |
Abbreviated Journal |
Measurement |
| Volume |
138 |
Issue |
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Pages |
25-33 |
| Keywords |
Lighting; Energy; Instrumentation; Planning; Light-emitting diode displays; Photometry; Video recording; Image analysis; CCD image sensors; Luminance; Glare |
| Abstract |
Improving knowledge of the light output of digital billboards is important to better assess their effect on driver distraction when they are installed along roads. In this work the emission of an LED based billboard is measured when playing advertising video-clips. In particular the average and the maximum values of the luminance are evaluated. The same video-clips are also analyzed when shown on an LCD monitor, aiming at separating the variability of the videos and of the playing device. The results allow to evaluate an utilization factor of the billboard: the videos have an average luminance around 11% and a peak luminance of 35% of the maximum luminance obtainable from the billboard. The power consumption of the billboard is measured, aside the photometric analysis. The luminance of the device are found linearly dependent on both the power and the effective current absorbed by the device from the grid, with a discrepancy within 6%. It could be a useful information for billboard manufacturers to qualify their product when they do not own photometric instruments. |
| Address |
Department of Industrial Engineering, University of Padova, Padova, Italy; pietro.fiorentin(at)unipd.it |
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Elsevier |
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English |
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English |
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0263-2241 |
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no |
| Call Number |
GFZ @ kyba @ |
Serial |
2214 |
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