| 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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| ISSN |
1424-8220 |
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| Notes |
PMID:27929391 |
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no |
| Call Number |
LoNNe @ kyba @ |
Serial |
1567 |
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| Author |
Min, M.; Zheng, J.; Zhang, P.; Hu, X.; Chen, L.; Li, X.; Huang, Y.; Zhu, L. |
| Title |
A low-light radiative transfer model for satellite observations of moonlight and earth surface light at night |
Type |
Journal Article |
| Year |
2020 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
Journal of Quantitative Spectroscopy and Radiative Transfer |
| Volume |
in press |
Issue |
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Pages |
106954 |
| Keywords |
Remote Sensing; Instrumentation |
| Abstract |
Lunar sun-reflected light can be effectively measured through a low-light band or a day/night band (DNB) implemented on space-based optical sensors. Based on moonlight, nocturnal observations for artificial light sources at night can be achieved. However, to date, an open-sourced and mature Low-Light Radiative Transfer Model (LLRTM) for the further understanding of the radiative transfer problem at night is still unavailable. Therefore, this study develops a new LLRTM at night with the correction of the lunar and active surface light sources. First, the radiative transfer equations with an active surface light source are derived for the calculation based on the lunar spectral irradiance (LSI) model. The simulation from this new LLRTM shows a minimal bias when compared with the discrete ordinates radiative transfer (DISORT) model. The simulated results of radiance and reflectance at the top of the atmosphere (TOA) also show that the surface light source has a remarkable impact on the radiative transfer process. In contrast, the change in the lunar phase angle has minimal influence. Also, comparing with space-based DNB radiance observations, LLRTM shows the potential to simulate space-based low-light imager observations under an effective surface light source condition during the night. |
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| ISSN |
0022-4073 |
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no |
| Call Number |
GFZ @ kyba @ |
Serial |
2850 |
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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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GFZ @ kyba @ |
Serial |
2214 |
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| Author |
Wang, G., Wang, S., Zhang, L., Sun, F., Yan, F., & Yang, X. |
| Title |
A New Light Control Method with Charge Induction of Moving Target |
Type |
Journal Article |
| Year |
2019 |
Publication |
IEEE Sensors Journal |
Abbreviated Journal |
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| Volume |
19 |
Issue |
16 |
Pages |
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| Keywords |
Lighting; Instrumentation |
| Abstract |
Intelligent lamp control system has been widely studied all over the world because of its energy saving and social effect. In this paper, a new intelligent lamp control method based on charge induction for moving target is proposed. The detection model is established with the surface charge induction and verified by a luggage detection experiment. The intelligent lamp control system using the detection method is carried out. The performance of the system demonstrates that the proposed method can detect the moving target at any orientation whatever with or without occlusion and the detection distance can reach more than 3 m for the pedestrian. |
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| Call Number |
IDA @ intern @ |
Serial |
2470 |
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| Author |
Rabaza, O.; Aznar-Dols, F.; Mercado-Vargas, M.; Espin-Estrella, A. |
| Title |
A new method of measuring and monitoring light pollution in the night sky |
Type |
Journal Article |
| Year |
2014 |
Publication |
Lighting Research and Technology |
Abbreviated Journal |
Lighting Research and Technology |
| Volume |
46 |
Issue |
1 |
Pages |
5-19 |
| Keywords |
Instrumentation; all-sky; measurement; modeling; monitoring |
| Abstract |
This paper describes a method of measuring and monitoring light pollution in the night sky. This method is capable of instantly quantifying the levels of artificial radiance and monochromatic luminance of the sky glow by means of a system that includes an all-sky camera as well as several interference filters. The calibration is done with an integrating sphere where the measurement pattern used is obtained from the light reflected from the inner wall of the sphere which comes from radiation emitted by a calibration lamp with a known luminous flux. The inner wall of this sphere is a Lambertian surface, which ensures that the light reflected or falling on it is uniformly dispersed in all directions (i.e. the surface luminance is isotropic). |
| Address |
Ovidio Rabaza Castillo, E.T.S. de Ingenieros de Caminos, Canales y Puertos, Departamento de Ingenieria Civil, Campus de Fuentenueva, Universidad de Granada, 18071, Granada, Spain E-mail: ovidio(at)ugr.es |
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| Publisher |
SAGE |
Place of Publication |
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| Language |
English |
Summary Language |
English |
Original Title |
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| ISSN |
1477-1535 |
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no |
| Call Number |
IDA @ john @ |
Serial |
1347 |
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