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Müller, A.; Wuchterl, G.; Sarazin, M. |
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Title |
Measuring the Night Sky Brightness with the Lightmeter. |
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2011 |
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ReVMexAA |
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41 |
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46–49 |
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Instrumentation; instrumentation: photometers; light pollution; methods: data analysis; methods: observational; site testing |
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We present a newly developed, low-cost photometer for long-term monitoring of the night sky brightness and
light pollution on Earth. The so-called Lightmeter is an as far as possible stand-alone operational, fully
weatherproof, and maintenance-free device. It provides a high data sampling rate of up to 1 Hz as well as a
superb sensitivity covering the whole brightness range down to the darkest night time conditions. The excellent
performance of the Lightmeter allows a continuously monitoring of the night sky brightness and opens a wide
range of applications at an observatory site like determining overall sky conditions in real time, cloud detection
and estimation of their velocity, measuring relative changes in extinction as well as the detection of long term
trends in brightness caused by an increase of artificial illumination. We will present first results of measurements
taken at Cerro Armazones, one of the best obser |
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LoNNe @ christopher.kyba @ |
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471 |
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Author |
Ma, S.; Yan, W.; Huang, Y.-X.; Ai, W.-H.; Zhao, X. |
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Title |
Vicarious calibration of S-NPP/VIIRS day-night band using deep convective clouds |
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Journal Article |
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2015 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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158 |
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42-55 |
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Instrumentation, Remote Sensing |
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0034-4257 |
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LoNNe @ christopher.kyba @ |
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1077 |
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Levin, N.; Phinn, S. |
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Title |
Illuminating the capabilities of Landsat 8 for mapping night lights |
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Journal Article |
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2016 |
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Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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182 |
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27-38 |
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Remote Sensing; Instrumentation |
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Remote sensing of night-lights has been enhanced in recent years with the availability of the new VIIRS Day and Night band, the commercial EROS-B satellite and astronaut photographs from the International Space Station. However, dedicated space-borne multispectral sensors offering radiance calibrated night lights imagery are yet to be launched. Here we examined the capabilities of Landsat 8 to acquire night time light images of the Earth. Examining seven night-time Landsat 8 scenes, we found that brightly lit areas in both urban (Berlin, Las Vegas, Nagoya and Tel-Aviv) and gas flares (Basra, Kuwait) areas were detected in all eight bands of Landsat 8. The threshold for detection of lit areas was approximately 0.4 W/m2/μm/sr in bands 1–5 and 8 of Landsat 8. This threshold level was higher than Landsat dark noise levels, and slightly lower than post launch Landsat 8 OLI band dependent noise equivalent radiance difference levels. Drawing on this, we call on the USGS to plan an annual night-time acquisition of urban and gas flares areas globally, and to enable the performance of the future Landsat 10 to be established in a way that it will be sensitive enough to image the Earth at night, thus performing as Nightsat during the night. |
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LoNNe @ kyba @ |
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1452 |
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Sánchez de Miguel, A.; Kyba, C.C.M.; Aubé, M.; Zamorano, J.; Cardiel, N.; Tapia, C.; Bennie, J.; Gaston, K.J. |
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Title |
Colour remote sensing of the impact of artificial light at night (I): The potential of the International Space Station and other DSLR-based platforms |
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2019 |
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Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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224 |
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92-103 |
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Remote Sensing; Instrumentation |
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Sensors on remote sensing satellites have provided useful tools for evaluation of the environmental impacts of nighttime artificial light pollution. However, due to their panchromatic nature, the data available from these sensors (VIIRS/DNB and DMSP/OLS) has a limited capacity accurately to assess this impact. Moreover, in some cases, recorded variations can be misleading. Until new satellite platforms and sensors are available, only nighttime images taken with DSLR cameras from the International Space Station (ISS), airplanes, balloons or other such platforms can provide the required information. Here we describe a theoretical approach using colour-colour diagrams to analyse images taken by astronauts on the ISS to estimate spatial and temporal variation in the spectrum of artificial lighting emissions. We then evaluate how this information can be used to determine effects on some key environmental indices: photopic vision, the Melatonin Suppression Index, the Star Light Index, the Induced Photosynthesis Index, production of NO2-NO radicals, energy efficiency and CO2 emissions, and Correlated Colour Temperature. Finally, we use the city of Milan as a worked example of the approach. |
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GFZ @ kyba @ |
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2189 |
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Li, X.; Ma, R.; Zhang, Q.; Li, D.; Liu, S.; He, T.; Zhao, L. |
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Title |
Anisotropic characteristic of artificial light at night – Systematic investigation with VIIRS DNB multi-temporal observations |
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Journal Article |
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2019 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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233 |
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111357 |
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Remote Sensing; Instrumentation |
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The released VIIRS DNB nightly images, also known as VIIRS DNB daily nighttime images, provide rich information for time series analysis of global socioeconomic dynamics. Anisotropic characteristic is a possible factor that influences the VIIRS DNB radiance at night and its time series analysis. This study aims to investigate the relationship between viewing angles and VIIRS DNB radiance of Suomi NPP satellite in urban areas. First, twenty-nine points were selected globally to explore the angle variation of Suomi NPP satellite views at night. We found that the variation of the satellite viewing zenith angle (VZA) is consistent (e.g. between 0° and 70°) since the range of VZA is fixed depending on the sensor design, and the range of viewing azimuth angle (VAA) increases with the increase of latitude. Second, thirty points in cities of Beijing, Houston, Los Angeles, Moscow, Quito and Sydney, were used to investigate the angle-radiance relationship. We proposed a zenith-radiance quadratic (ZRQ) model and a zenith-azimuth-radiance binary quadratic (ZARBQ) model to quantify the relationship between satellite viewing angles and artificial light radiance, which has been corrected by removing the moonlight and atmospheric impact from VIIRS DNB radiance products. For all the thirty points, the ZRQ and ZARBQ analysis have averaged R2 of 0.50 and 0.53, respectively, which indicates that the viewing angles are important factors influencing the variation of the artificial light radiance, but extending zenith to zenith-azimuth does not much better explain the variation of the observed artificial light. Importantly, based on the data analysis, we can make the hypothesis that building height may affect the relationship between VZA and artificial light, and cold and hot spot effects are clearly found in tall building areas. These findings are potentially useful to reconstruct more stable time series VIIRS DNB images for socioeconomic applications by removing the angular effects. |
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GFZ @ kyba @ |
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2621 |
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