| Records |
| Author |
Joachim, L.; Storch, T. |
| 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 |
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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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2194-9050 |
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GFZ @ kyba @ |
Serial |
3064 |
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| Author |
Su, Z.; Zhong, X.; Zhang, G.; Li, Y.; He, X.; Wang, Q.; Wei, Z.; He, C.; Li, D. |
| Title |
High Sensitive Night-time Light Imaging Camera Design and In-orbit Test of Luojia1-01 Satellite |
Type |
Journal Article |
| Year |
2019 |
Publication |
Sensors |
Abbreviated Journal |
Sensors |
| Volume |
19 |
Issue |
4 |
Pages |
797 |
| Keywords |
Remote Sensing; Instrumentation |
| Abstract |
Luojia1-01 satellite is the first scientific experimental satellite applied for night-time light remote sensing data acquisition, and the payload is an optical camera with high sensitivity, high radiation measurement accuracy and stable elements of interior orientation. At the same time, a special shaped hood is designed, which significantly improved the ability of the camera to suppress stray light. Camera electronics adopts the integrated design of focal plane and imaging processing, which greatly reduces the volume and weight of the system. In this paper, the design of the optical camera is summarized, and the results of in-orbit imaging performance tests are analyzed. The results show that the dynamic modulation transfer function (MTF) of the camera is better than 0.17, and the SNR is better than 35 dB under the condition of 10 lx illuminance and 0.3 reflectivity and all indicators meet the design requirements. The data obtained have been widely applied in many fields such as the process of urbanization, light pollution analysis, marine fisheries detection and military. |
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1424-8220 |
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GFZ @ kyba @ |
Serial |
2215 |
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Kyba, C.C.M.; Ruhtz, T.; Fischer, J.; Hölker, F. |
| Title |
Red is the new black: how the colour of urban skyglow varies with cloud cover |
Type |
Journal Article |
| Year |
2012 |
Publication |
Monthly Notices of the Royal Astronomical Society |
Abbreviated Journal |
Monthly Notices of the Royal Astronomical Society |
| Volume |
425 |
Issue |
1 |
Pages |
701-708 |
| Keywords |
Keywords: skyglow; radiative transfer; atmospheric effects; instrumentation: detectors; light pollution |
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The development of street lamps based on solid-state lighting technology is likely to introduce a major change in the colour of urban skyglow (one form of light pollution). We demonstrate the need for long-term monitoring of this trend by reviewing the influences it is likely to have on disparate fields. We describe a prototype detector which is able to monitor these changes, and could be produced at a cost low enough to allow extremely widespread use. Using the detector, we observed the differences in skyglow radiance in red, green and blue channels. We find that clouds increase the radiance of red light by a factor of 17.6, which is much larger than that for blue (7.1). We also find that the gradual decrease in sky radiance observed on clear nights in Berlin appears to be most pronounced at longer wavelengths. |
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0035-8711 |
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IDA @ john @ |
Serial |
272 |
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| Author |
Spur, M.; Houel, N.; Tourre, V. |
| 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 |
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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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2194-9034 |
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GFZ @ kyba @ |
Serial |
3105 |
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| Author |
Gaston, K.J. |
| Title |
Sustainability: A green light for efficiency |
Type |
Journal Article |
| Year |
2013 |
Publication |
Nature |
Abbreviated Journal |
Nature |
| Volume |
497 |
Issue |
7451 |
Pages |
560-561 |
| Keywords |
Editorial; Animals; Atmosphere/chemistry; Carbon Dioxide/analysis; Circadian Rhythm/physiology; Conservation of Energy Resources/economics/*methods/*trends; Global Warming/prevention & control; Humans; Lighting/*economics/instrumentation/statistics & numerical data/*trends; Public Health |
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Environment and Sustainability Institute, University of Exeter, Penryn, UK. k.j.gaston@exeter.ac.uk |
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English |
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0028-0836 |
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PMID:23719447 |
Approved |
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LoNNe @ christopher.kyba @ |
Serial |
459 |
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