| Records |
| Author |
Aubé, M.; Simoneau, A.; Muñoz-Tuñón, C.; Díaz-Castro, J.; Serra-Ricart, M. |
| Title |
Restoring the night sky darkness at Observatorio del Teide: First application of the model Illumina version 2 |
Type |
Journal Article |
| Year |
2020 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
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| Volume |
497 |
Issue  |
3 |
Pages |
2501-2516 |
| Keywords |
Skyglow; Teide Observatory; Tenerife; Spain; modeling; Illumina; numerical methods |
| Abstract |
The propagation of artificial light into real environments is complex. To perform its numerical modelling with accuracy, one must consider hyperspectral properties of the lighting devices and their geographic positions, the hyperspectral properties of the ground reflectance, the size and distribution of small-scale obstacles, the blocking effect of topography, the lamps angular photometry and the atmospheric transfer function (aerosols and molecules). A detailed radiative transfer model can be used to evaluate how a particular change in the lighting infrastructure may affect the sky radiance. In this paper, we use the new version (v2) of the Illumina model to evaluate a night sky restoration plan for the Teide Observatory located on the island of Tenerife, Spain. In the past decades, the sky darkness was severely degraded by growing light pollution on the Tenerife Island. In this work, we use the contribution maps giving the effect of each pixel of the territory to the artificial sky radiance. We exploit the hyperspectral capabilities of Illumina v2 and show how the contribution maps can be integrated over regions or municipalities according to the Johnson–Cousins photometric bands spectral sensitivities. The sky brightness reductions per municipality after a complete shutdown and a conversion to light-emitting diodes are calculated in the Johnson–Cousins B, V, R bands. We found that the conversion of the lighting infrastructure of Tenerife with LED (1800 and 2700 K), according to the conversion strategy in force, would result in a zenith V-band sky brightness reduction of ≈0.3 mag arcsec−2. |
| Address |
Département de physique, Cégep de Sherbrooke, Sherbrooke, 475 rue du Cégep, Sherbrooke, Québec J1E 4K1, Canada; martin.aube ( at ) cegepsherbrooke.qc.ca |
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| Publisher |
Oxford Academic |
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| Language |
English |
Summary Language |
English |
Original Title |
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Edition |
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| ISSN |
0035-8711 |
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Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
3406 |
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| Author |
Nievas Rosillo, M. |
| Title |
Absolute photometry and Night Sky Brightness with all-sky cameras |
Type |
Report |
| Year |
2013 |
Publication |
e-prints Complutense |
Abbreviated Journal |
e-prints Complutense |
| Volume |
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Issue |
24626 |
Pages |
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| Keywords |
Instrumentation; skyglow; measurement; modeling |
| Abstract |
All-sky cameras have proven to be powerful tools to continuously monitoring the sky in a wide range of fields in both Astrophysics and Meteorology. In this work, we have developed a complete software pipeline to analyze the night CCD images obtained with one of such systems. This let us to study typical parameters used in Astrophysics to characterize the night sky quality, such as the Sky Brightness, the Cloud Coverage and the Atmospheric Extinction, how they evolve over the time and their variability. Using our software, we analyzed a large set of data from AstMon-OT all-sky camera at Teide Observatory. Results from this work have been applied in the support to the spanish CTA site proposal at Izaña, Tenerife and are being discussed within the CTA consortium. A comparison with data from other devices that have been used in site characterization such as the IAC80 telescope is also presented. This comparison is used to validate the results of the analysis of all-sky images. Finally, we test our software with AstMon-UCM and DSLR cameras. Some general recommendations for the use of DSLR cameras are provided. |
| Address |
Departamento de Astrofísica y Ciencias de la Atmosfera, Universidad Complutense de Madrid, Madrid, Spain |
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Thesis |
Master's thesis |
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Place of Publication |
Madrid |
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| Language |
English |
Summary Language |
English |
Original Title |
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Series Title |
e-prints Complutense |
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no |
| Call Number |
IDA @ john @ |
Serial |
1437 |
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| Author |
Zeng, C.; Zhou, Y.; Wang, S.; Yan, F.; Zhao, Q. |
| Title |
Population spatialization in China based on night-time imagery and land use data |
Type |
Journal Article |
| Year |
2011 |
Publication |
International Journal of Remote Sensing |
Abbreviated Journal |
International Journal of Remote Sensing |
| Volume |
32 |
Issue |
24 |
Pages |
9599-9620 |
| Keywords |
DMSP-OLS; remote sensing; light at night; population; modeling |
| Abstract |
Population is a key indicator of socioeconomic development, urban planning and environmental protection, particularly for developing countries like China. But, census data for any given area are neither always available nor adequately reflect the internal differences of population. The authors tried to overcome this problem by spatializing the population across China through utilizing integer night-time imagery (Defense Meteorological Satellite Program/Operational Linescan System, DMSP/OLS) and land-use data. In creating the population linear regression model, night-time light intensity and lit areas, under different types of land use, were employed as predictor variables, and census data as dependent variables. To improve model performance, eight zones were created using night-time imagery clustering and shortest path algorithm. The population model is observed to have a coefficient of determination (R 2) ranging from 0.80 to 0.95 in the research area, which remained the same in different years. A comparison of the results of this study with those of other researchers shows that the spatialized population density map, prepared on the basis of night-time imagery, reflects the population distribution character more explicitly and in greater detail. |
| Address |
State Key Laboratory of Remote Sensing Science , Jointly Sponsored by the Institute of Remote Sensing Applications of the Chinese Academy of Sciences and Beijing Normal University , Beijing, 100101, PR China |
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0143-1161 |
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Approved |
no |
| Call Number |
IDA @ john @ |
Serial |
228 |
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| Author |
Kocifaj, M. |
| Title |
Two-stream approximation for rapid modeling the light pollution levels in local atmosphere |
Type |
Journal Article |
| Year |
2012 |
Publication |
Astrophysics and Space Science |
Abbreviated Journal |
Astrophys Space Sci |
| Volume |
341 |
Issue |
2 |
Pages |
301-307 |
| Keywords |
Light pollution; Atmospheric effects; Methods: numerical; Radiative transfer; Scattering; modeling; two-stream approximation |
| Abstract |
The two-stream concept is used for modeling the radiative transfer in Earth's atmosphere illuminated by ground-based light sources. The light pollution levels (illuminance and irradiance) are computed for various aerosol microphysical parameters, specifically the asymmetry parameter g A , single scattering albedo ω A , and optical thickness τ A . Two distinct size distributions of Junge's and gamma-type are employed. Rather then being a monotonic function of τ A , the diffuse illuminance/irradiance shows a local minimum at specific τ A, lim independent of size distribution taken into consideration. The existence of local minima has relation to the scattering and attenuation efficiencies both of which have opposite effects. The computational scheme introduced in this paper is advantageous especially if the entire set of calculations needs to be repeated with an aim to simulate diffuse light in various situations and when altering optical states of the atmospheric environment. |
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0004-640X |
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no |
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IDA @ john @ |
Serial |
273 |
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| Author |
Kocifaj, M. |
| Title |
Light-pollution model for cloudy and cloudless night skies with ground-based light sources |
Type |
Journal Article |
| Year |
2007 |
Publication |
Applied Optics |
Abbreviated Journal |
Appl. Opt. |
| Volume |
46 |
Issue |
15 |
Pages |
3013 |
| Keywords |
light pollution; modeling |
| Abstract |
The scalable theoretical model of light pollution for ground sources is presented. The model is successfully employed for simulation of angular behavior of the spectral and integral sky radiance and∕or luminance during nighttime. There is no restriction on the number of ground-based light sources or on the spatial distribution of these sources in the vicinity of the measuring point (i.e., both distances and azimuth angles of the light sources are configurable). The model is applicable for real finite-dimensional surface sources with defined spectral and angular radiating properties contrary to frequently used point-source approximations. The influence of the atmosphere on the transmitted radiation is formulated in terms of aerosol and molecular optical properties. Altitude and spectral reflectance of a cloud layer are the main factors introduced for simulation of cloudy and∕or overcast conditions. The derived equations are translated into numerically fast code, and it is possible to repeat the entire set of calculations in real time. The parametric character of the model enables its efficient usage by illuminating engineers and∕or astronomers in the study of various light-pollution situations. Some examples of numerical runs in the form of graphical results are presented. |
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0003-6935 |
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IDA @ john @ |
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277 |
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