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Author |
Simoneau, A.; Aubé, M.; Leblanc, J.; Boucher, R.; Roby, J.; Lacharité, F. |
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Title |
PSFs for mapping artificial night sky luminance over large territories |
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Journal Article |
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Year |
2021 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
MNRAS |
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in press |
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Keywords |
Skyglow; light pollution; simulations; atmospheric effects; radiative transfer; numerical methods; site testing |
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Abstract |
Knowledge of the night sky radiance over a large territory may be valuable information to identify sites appropriate to astronomical observations or for asserting the impacts of artificial light at night on ecosystems. Measuring the sky radiance can be a complex endeavour depending on the desired temporal and spatial resolution. Similarly, modelling of artificial night sky radiance for multiple points of a territory can represent a significant amount of computing time depending on the complexity of the model used. We suggest performing modelling of
the sky radiance over large territories using the convolution of a transfer function determined with the radiative transfer model Illumina v2. The transfer functions are used as Point Spread Functions of single light sources over a complex light source geographical distributions. The main contributions of our work are to determine how the Point Spread Function is sensitive to the main driving parameters of the artificial night sky radiance such as the wavelength, the ground reflectance, the obstacles properties, the Upward Light Output Ratio and the Aerosol Optical Depth. The method is applied to the territory of the Mont-Mégantic International Dark Sky Reserve in Canada. We repeated the experiment for winter and summer conditions and compared the maps to the New world atlas of artificial night sky brightness, to different setup of the Illumina v2 model and to in situ Sky Quality Camera measurements. The typical errors associated with the method were evaluated. |
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Département de géomatique appliquée, Université de Sherbrooke, 2500 Boul. de l’Université, Sherbrooke, J1K 2R1, Canada; martin.aube ( at ) cegepsherbrooke.qc.ca |
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Royal Astronomical Society |
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English |
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IDA @ john @ |
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3301 |
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Ogoro M.; Ernest S. J.; Chukwudi D. O. |
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Title |
Spatial Trend Of Light Pollution In Obio/Akpor Lga, Rivers State, Nigeria |
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Journal Article |
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2020 |
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International Journal of Novel Research in Civil Structural and Earth Sciences |
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7 |
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2 |
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Keywords |
Lighting; Perception |
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The study examines the spatial trend of light pollution across the study area. The Global Positioning System (GPS) was used to acquire the coordinates of each respondent resident, where structured questionnaire were administered in the study area and then imported to the ArcGIS 9.3 software environment to analyse the spatial trend in light pollution using the Inverse Distance Weighted (IDW) method of interpolation. Findings, reveals that the perception of pollution by light stray is obviously noticed by the respondents with particular emphasis on light stray from traffic light, neighbor security lights which to a large extend alters their level of comfort and distort their level of outdoor relaxation. Thus, the study recommends, among others, that: shielded light bulbs or properly designed light fittings should be installed to avoid light rays spreading beyond the needed boundaries. And measure should be taken to ensure car drivers use properly fixed headlamps that are not damaged and also, awareness should be passed on adequate use of headlamps by road users (vehicle drivers) on streets when compared with use on highways and minor roads. |
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2394-7357 |
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UP @ altintas1 @ |
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3205 |
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Walczak, K.; Crim, G.; Gesite, T.; Habtemichael, S.; Morgan, J.; Tarr, C.; Turkic, L.; Wiedemann, J. |
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The GONet (Ground Observing Network) Camera: An Inexpensive Light Pollution Monitoring System |
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Report |
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2020 |
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preprint |
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Instrumentation; GONet; Light pollution; All-sky imaging; Sky brightness; Monitoring |
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Instrumentation developed to monitor and characterize light pollution from the ground has helped frame our understanding of the impacts of artificial light at night (ALAN) [Bará, Lima, & Zamorano, 2019; Hänel et al., 2018; Zamorano et al., 2017]. All-sky imaging has been used to quantify and characterize ALAN in a variety of environments [D. M. Duriscoe, 2016; Jechow, Kyba, & Hölker, 2019]. Over the past decade growth in access to DIY electronics has afforded the opportunity for the development of new and affordable instrumentation for ALAN research. The
GONet (Ground Observing Network) camera is an inexpensive (~USD 100), simple to use, all-sky imaging system designed to allow measurements of sky quality at night. Due to their ease of use and low price, GONet cameras allow observations by users with little technical expertise, large inter-comparison campaigns and deployments of opportunity. Developed as a student engineering project at the Adler Planetarium, initial field tests of the GONet system have demonstrated its utility as a tool that can benefit ALAN research. Here we present an overview of the
design and use of the GONet device, methods of calibration, initial results from observations, potential use cases, and limitations of the system. What we describe here is the version 1 GONet camera. We conclude with a brief description
of the version 2 unit already under development. |
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Adler Planetarium, Chicago, Illinois 60605, USA; kwalczak ( at ) adlerplanetarium.org |
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IDA @ john @ |
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3305 |
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Ivajnsic, D., & Žiberna, I. |
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Daljinsko zaznavanje svetlobne onesnaženosti v Sloveniji / Remote sensing of light polution in Slovenia |
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2018 |
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Revija za geografijo |
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13 |
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1 |
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113-132 |
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Remote Sensing |
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Izvleček
Daljinsko zaznavanje svetlobne onesnaženosti v Sloveniji
V članku so predstavljeni rezultati analize svetlobne onesnaženosti na območju Slovenije v obdobju 2013-2017. Podatki so pridobljeni s satelita Suomi NPP, ki snema površje Zemlje tudi v nočnem kanalu. Prikazani so rezultati svetlobne onesnaženosti po občinah in trendi svetlobne onesnaženosti v omenjenem obdobju. Posebej so izpostavljena območja z zelo visokimi in nizkimi vrednostmi svetlobne onesnaženosti.
Abstract
Remote sensing of light pollution in Slovenia
The study deals with the problem of light pollution in Slovenia in the period 2013-2017. Remotely sensed data were obtained from the Suomi NPP satellite, which is scanning the earth's surface at night. The findings and geospatial trends of light pollution in the mentioned time period are discussed on the national and municipal levels. Some areas with very high and low levels of light pollution were exposed. |
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Slovenian |
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IDA @ intern @ |
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2343 |
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Author |
Fouchard, M., Hébrard, J.-P., Geoffroy, D., & Ponel, P. |
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Contribution à la connaissance des communautés d'Hétérocères et de Coléoptères crépusculaires et nocturnes de l’île de Porquerolles (archipel des îles d'Hyères, département du Var) en lien avec les milieux |
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2019 |
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Scientific reports of the Port-Cros national park |
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33 |
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127-162 |
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Ecology |
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À l’initiative de la municipalité d’Hyères-les-Palmiers et du Parc national de Port-Cros, une étude sur la qualité de la nuit à Porquerolles a été lancée par l’Association Nationale pour la Protection du Ciel et de l’Environnement Nocturnes (ANPCEN) en 2016. L’objectif de cette étude est de tendre vers un éclairage efcace tout en limitant son impact sur l’environnement. La présente étude entre dans le cadre de ce projet. Son objectif est d’améliorer les connaissances sur les Hétérocères et les Coléoptères crépusculaires et nocturnes de Porquerolles et d’analyser les résultats par rapport à la problématique de la pollution lumineuse. Trois points de relevé (jardin Emmanuel Lopez, bassins de lagunage, fort de la Repentance), représentatifs de différents milieux et de différentes expositions à la pollution lumineuse ont été étudiés lors de 4 sessions en 2016/2017. La qualité de la nuit selon l’étude de l’ANPCEN est moins bonne au jardin Emmanuel Lopez par rapport au bassin de lagunage et au fort de la Repentance, ce dernier étant le point ayant la meilleure qualité de nuit. Au total, 93 espèces de Coléoptères et 64 espèces d’Hétérocères ont été observées sur l’île de Porquerolles. Pour les Hétérocères, un gradient de richesse spécique est observé du point le plus exposé à la pollution lumineuse à celui qui est le moins exposé, avec 21 espèces pour le jardin Emmanuel Lopez (point n°1), 35 pour le bassin de lagunage (point n°2) et 57 pour le fort de la Repentance (point n°3). Pour les Coléoptères en revanche, le point n°1 est aussi riche que le n° 3 avec 56 espèces pour chacun alors que le point n°2 ne comporte que 38 espèces. Une fois les pistes d’actions proposées par l’ANPCEN pour la réduction des pollutions mises en place sur l’île de Porquerolles, il sera intéressant de réaliser — 128 —une nouvelle campagne d’inventaires selon le même protocole an d’identier une éventuelle évolution de la diversité et de l’abondance en Hétérocères et en Coléoptères. |
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French |
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IDA @ intern @ |
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