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Author |
Aubrecht, C.; León Torres, J. |
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Title |
Evaluating Multi-Sensor Nighttime Earth Observation Data for Identification of Mixed vs. Residential Use in Urban Areas |
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Journal Article |
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2016 |
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Remote Sensing |
Abbreviated Journal |
Remote Sensing |
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8 |
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2 |
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114 |
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Remote Sensing |
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2072-4292 |
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LoNNe @ kyba @ |
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1353 |
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Author |
Jechow, A.; Hölker, F.; Kolláth, Z.; Gessner, M.O.; Kyba, C.C.M. |
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Title |
Evaluating the summer night sky brightness at a research field site on Lake Stechlin in northeastern Germany |
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Journal Article |
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Year |
2016 |
Publication |
Journal of Quantitative Spectroscopy and Radiative Transfer |
Abbreviated Journal |
Journal of Quantitative Spectroscopy and Radiative Transfer |
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181 |
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24-32 |
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Keywords |
Skyglow |
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We report on luminance measurements of the summer night sky at a field site on a freshwater lake in northeastern Germany (Lake Stechlin) to evaluate the amount of artificial skyglow from nearby and distant towns in the context of a planned study on light pollution. The site is located about 70 km north of Berlin in a rural area possibly belonging to one of the darkest regions in Germany. Continuous monitoring of the zenith sky luminance between June and September 2015 was conducted utilizing a Sky Quality Meter. With this device, typical values for clear nights in the range of 21.5–21.7 magSQM/arcsec2 were measured, which is on the order of the natural sky brightness during starry nights. On overcast nights, values down to 22.84 magSQM/arcsec2 were obtained, which is about one third as bright as on clear nights. The luminance measured on clear nights as well as the darkening with the presence of clouds indicate that there is very little influence of artificial skyglow on the zenith sky brightness at this location. Furthermore, fish-eye lens sky imaging luminance photometry was performed with a digital single-lens reflex camera on a clear night in the absence of moonlight. The photographs unravel several distant towns as possible sources of light pollution on the horizon. However, the low level of artificial skyglow makes the field site at Lake Stechlin an excellent location to study the effects of skyglow on a lake ecosystem in a controlled fashion. |
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0022-4073 |
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LoNNe @ kyba @; GFZ @ kyba @ |
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1354 |
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Kotarba, A.Z.; Aleksandrowicz, S. |
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Title |
Impervious surface detection with nighttime photography from the International Space Station |
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Journal Article |
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Year |
2016 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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176 |
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295-307 |
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Keywords |
Remote Sensing |
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For over two decades nighttime satellite imagery from the Operational Linescan System (OLS) has been used to detect impervious surfaces. However, OLS-based maps suffer from the sensor's coarse resolution (2.7 km/pixel), overglow, and saturation in urban areas, resulting in inaccurate estimates of the extent and degree of impervious surfaces. In order to provide more reliable estimates of impervious surface extent, we used high resolution (~ 10 m/pixel) nighttime photography from the International Space Station (ISS). Focusing on the city of Berlin in Germany, we produced a map of the extent of impervious surfaces. Our classification was 85% accurate for both user and producer measures. Impervious surfaces omitted by ISS photography were mainly transit roads and airport runways, while green areas and water bodies within the city were falsely identified. An analysis based on ISS imagery classified 55.7% of the study area as impervious, which is only 3.9% less than ground truth (while the OLS-based estimate was 40% higher than ground truth). ISS imagery failed to provide reliable information about the degree of imperviousness for individual pixels (± 20% errors); nevertheless it accurately estimated the spatially-averaged degree of imperviousness for the whole study area (30.2% vs. the reference value of 30.1%). These results show that ISS photography is an important source of nighttime imagery for mapping the extent of impervious surfaces, and represents a considerable improvement over OLS capabilities. |
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0034-4257 |
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LoNNe @ kyba @ |
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1356 |
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Kaneshi, Y.; Ohta, H.; Morioka, K.; Hayasaka, I.; Uzuki, Y.; Akimoto, T.; Moriichi, A.; Nakagawa, M.; Oishi, Y.; Wakamatsu, H.; Honma, N.; Suma, H.; Sakashita, R.; Tsujimura, S.-I.; Higuchi, S.; Shimokawara, M.; Cho, K.; Minakami, H. |
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Title |
Influence of light exposure at nighttime on sleep development and body growth of preterm infants |
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2016 |
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Scientific Reports |
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Sci Rep |
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6 |
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21680 |
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Health |
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Previous studies have demonstrated that a light-dark cycle has promoted better sleep development and weight gain in preterm infants than constant light or constant darkness. However, it was unknown whether brief light exposure at night for medical treatment and nursing care would compromise the benefits brought about by such a light-dark cycle. To examine such possibility, we developed a special red LED light with a wavelength of >675 nm which preterm infants cannot perceive. Preterm infants born at <36 weeks' gestational age were randomly assigned for periodic exposure to either white or red LED light at night in a light-dark cycle after transfer from the Neonatal Intensive Care Unit to the Growing Care Unit, used for supporting infants as they mature. Activity, nighttime crying and body weight were continuously monitored from enrolment until discharge. No significant difference in rest-activity patterns, nighttime crying, or weight gain was observed between control and experimental groups. The data indicate that nursing care conducted at 3 to 4-hour intervals exposing infants to light for <15 minutes does not prevent the infants from developing circadian rest-activity patterns, or proper body growth as long as the infants are exposed to regular light-dark cycles. |
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Department of Obstetrics, Hokkaido University Graduate School of Medicine, N15, W7, Kitaku, Sapporo 060-8638, Japan |
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English |
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2045-2322 |
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PMID:26877166 |
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LoNNe @ kyba @ |
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1358 |
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Author |
Katz, Y.; Levin, N. |
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Title |
Quantifying urban light pollution -- A comparison between field measurements and EROS-B imagery |
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Journal Article |
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Year |
2016 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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177 |
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65-77 |
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Keywords |
Remote Sensing; Skyglow |
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0034-4257 |
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LoNNe @ kyba @ |
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1359 |
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