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Author Ribas, S. J.; Aubé, M.; Bará, S.; Bouroussis, C.; Canal-Domingo, R.; Espey, B.; Hänel, A.; Jechow, A.; Kolláth, Z.; Marti, G.; Massana, P.; Schmidt, W.; Spoelstra, H.; Wuchterl, G.; Zamorano, J.; Kyba, C. doi  openurl
  Title Report of the 2016 STARS4ALL/LoNNe Intercomparison Campaign Type Report
  Year 2017 Publication Abbreviated Journal  
  Volume Issue (up) Pages  
  Keywords Skyglow; Instrumentation  
  Abstract The 2016 LoNNe (Loss of the Night Network) intercomparison campaign is the fourth of four campaigns planned during EU COST Action ES1204. The first campaign took place in 2013 in Lastovo, Croatia, the second in Madrid, Spain (Bará et al 2015), the third in Torniella and Florence, Italy (Kyba et al 2015a). The 2016 campaign took place at the Parc Astronòmic Montsec (PAM). The campaign continued the strategy of taking measurements at multiple sites, this year with a main fixed site and then excursions to other sites. The goals of the campaigns included:

● Understanding the difference between extinction measurements made by DSLR photometry and classical astronomical (telescope) photometry, and also understanding the relation between extinction and sky brightness at these two sites.

● Examining the difference in radiance measured with the mosaic technique of the US National Parks Service camera compared to all-sky fisheye imagery

● Examining the relationships between all-sky and zenith radiance reported by different instruments

● Quantifying the sky brightnes at the sites, including full zenith spectral radiance at selected locations

● Measuring the systematic uncertainty on handheld SQM observations due to unit-to-unit differences
 
  Address  
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  Publisher GFZ Data Services Place of Publication Editor  
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  Call Number GFZ @ kyba @ Serial 3057  
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Author Fiorentin, P.; Bertolo, A.; Cavazzani, S.; Ortolani, S. url  doi
openurl 
  Title Calibration of digital compact cameras for sky quality measures 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 (up) Pages  
  Keywords Skyglow; Instrumentation  
  Abstract This work presents the possibility of using the extremely popular compact digital cameras of smartphones or action cameras to perform sky photometry. The newest generation of these devices allows to save raw images. They are not as good as digital single-lens reflex camera, in particular in terms of sensitivity, noise and pixel depth (10 bit versus 12 bit or more), but they have the advantage of being extremely widespread on the population and relatively cheap. These economical digital compact cameras work with an electronic shutter, it overcomes the consumption of mechanics and allows to gather images for long time. The work uses a simple calibration method to transfer raw data from the proprietary RGB color space to the standard CIE 1931 color space. It allows the measurement of sky luminance in cd m−2 with an expected uncertainty of about 20%. Furthermore, the colorimetric calibration allows to know the correlated color temperature of a portion of the sky, it can help the identification of the kind of polluting sources. Aiming at better clarifying the performances of calibrated digital compact cameras, a comparison with a calibrated DSLR camera is presented in outdoor situations showing a good agreement both for luminance and color temperature measurements.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0022-4073 ISBN Medium  
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  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 3063  
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Author Joachim, L.; Storch, T. url  doi
openurl 
  Title Cloud Detection For Night-Time Panchromatic Visible And Near-Infrared Satellite Imagery Type Journal Article
  Year 2020 Publication ISPRS Annals of Photogrammetry, Remote Sensing and Spatial Information Sciences Abbreviated Journal ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci.  
  Volume V-2-2020 Issue (up) Pages 853-860  
  Keywords Instrumentation; Remote Sensing  
  Abstract Cloud detection for night-time panchromatic visible and near-infrared (VNIR) satellite imagery is typically performed based on synchronized observations in the thermal infrared (TIR). To be independent of TIR and to improve existing algorithms, we realize and analyze cloud detection based on VNIR only, here NPP/VIIRS/DNB observations. Using Random Forest for classifying cloud vs. clear and focusing on urban areas, we illustrate the importance of features describing a) the scattering by clouds especially over urban areas with their inhomogeneous light emissions and b) the normalized differences between Earth’s surface and cloud albedo especially in presence of Moon illumination. The analyses substantiate the influences of a) the training site and scene selections and b) the consideration of single scene or multi-temporal scene features on the results for the test sites. As test sites, diverse urban areas and the challenging land covers ocean, desert, and snow are considered. Accuracies of up to 85% are achieved for urban test sites.  
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  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2194-9050 ISBN Medium  
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  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 3064  
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Author Spur, M.; Houel, N.; Tourre, V. url  doi
openurl 
  Title Visualizing Multilayered Geospatial Data In Virtual Reality To Assess Public Lighting Type Journal Article
  Year 2020 Publication ISPRS – International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences Abbreviated Journal Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.  
  Volume Xliii-B4-2020 Issue (up) Pages 623-630  
  Keywords Lighting; Instrumentation; Vision  
  Abstract With the improvement and proliferation of virtual reality devices, their use for research and professional activity is broadening,fostering the advent of the field of immersive analytics, as is their acceptance among consumers. Other than the heightened sense of immersion into visualized data they provide, they also make displays of much larger apparent size and different positioning practical than what would be possible otherwise. Drawing on these benefits, we implemented a development of Multiple and Coordinated Displays (MCVs) for geovisualization that stacks different layers of data above each other, tilted for legibility. In a formal experiment, we evaluated it and two other, comparable MCV methods implemented in VR for their usefulness in analyzing public perception and soliciting public feedback regarding urban street lighting. In that field, the direction has recently been shifting from purely systemic development to a participatory approach, thus our investigation was into how a system like this could facilitate participation that can yield actionable results. Previous analysis of interaction data and usability questionnaires reveals preferences for certain systems depending on user characteristics, with the stack system showing a slight advantage over a grid of layers and especially over temporal multiplexing. We show that regardless of MCV variation, participants were able to analyze and provide feedback on public lighting situations that can directly contribute to urbanist work. The MCV approach further aided in understanding their choices, as eye-tracking allowed us to analyze attention to individual data layers.  
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  Series Volume Series Issue Edition  
  ISSN 2194-9034 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number GFZ @ kyba @ Serial 3105  
Permanent link to this record
 

 
Author Walczak, K.; Crim, G.; Gesite, T.; Habtemichael, S.; Morgan, J.; Tarr, C.; Turkic, L.; Wiedemann, J. url  openurl
  Title The GONet (Ground Observing Network) Camera: An Inexpensive Light Pollution Monitoring System Type Report
  Year 2020 Publication Abbreviated Journal  
  Volume preprint Issue (up) Pages  
  Keywords Instrumentation; GONet; Light pollution; All-sky imaging; Sky brightness; Monitoring  
  Abstract 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.
 
  Address Adler Planetarium, Chicago, Illinois 60605, USA; kwalczak ( at ) adlerplanetarium.org  
  Corporate Author Thesis  
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  Language English Summary Language English Original Title  
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  Notes Approved no  
  Call Number IDA @ john @ Serial 3305  
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