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Author Windle, A. E., Hooley, D. S., & Johnston, D. W.
Title Robotic Vehicles Enable High-Resolution Light Pollution Sampling of Sea Turtle Nesting Beaches Type Journal Article
Year 2018 Publication Frontiers in Marine Science Abbreviated Journal
Volume 5 Issue 493 Pages
Keywords Instrumentation; Animals; Skyglow
Abstract Nesting sea turtles appear to avoid brightly lit beaches and often turn back to sea prematurely when exposed to artificial light. Observations and experiments have noted that nesting turtles prefer darker areas where buildings and high dunes act as light barriers. As a result, sea turtles often nest on darker beaches, creating spatial concentrations of nests. Artificial nighttime light, or light pollution, has been quantified using a variety of methods. However, it has proven challenging to make accurate measurements of ambient light at fine scales and on smaller nesting beaches. Additionally, light has traditionally been measured from stationary tripods perpendicular to beach vegetation, disregarding the point of view of a nesting sea turtle. In the present study, nighttime ambient light conditions were assessed on three beaches in central North Carolina: a developed coastline of a barrier island, a nearby State Park on the same barrier island comprised of protected and undeveloped land, and a completely uninhabited wilderness on an adjacent barrier island in the Cape Lookout National Seashore. Using an autonomous terrestrial rover, high resolution light measurements (mag/arcsec2) were collected every minute with two ambient light sensors along transects on each beach. Spatial comparisons between ambient light and nesting density at and between these locations reveal that highest densities of nests occur in regions with lowest light levels, supporting the hypothesis that light pollution from coastal development may influence turtle nesting distribution. These results can be used to support ongoing management strategies to mitigate this pressing conservation issue.
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Call Number IDA @ intern @ Serial 2315
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Author Jechow, A.; Kyba, C.; Hölker, F.
Title Beyond All-Sky: Assessing Ecological Light Pollution Using Multi-Spectral Full-Sphere Fisheye Lens Imaging Type Journal Article
Year 2019 Publication Journal of Imaging Abbreviated Journal J. Imaging
Volume 5 Issue 4 Pages 46
Keywords Instrumentation; Skyglow
Abstract Artificial light at night is a novel anthropogenic stressor. The resulting ecological light pollution affects a wide breadth of biological systems on many spatio-temporal scales, from individual organisms to communities and ecosystems. However, a widely-applicable measurement method for nocturnal light providing spatially resolved full-spectrum radiance over the full solid angle is still missing. Here, we explain the first step to fill this gap, by using a commercial digital camera with a fisheye lens to acquire vertical plane multi-spectral (RGB) images covering the full solid angle. We explain the technical and practical procedure and software to process luminance and correlated color temperature maps and derive illuminance. We discuss advantages and limitations and present data from different night-time lighting situations. The method provides a comprehensive way to characterize nocturnal light in the context of ecological light pollution. It is affordable, fast, mobile, robust, and widely-applicable by non-experts for field work.
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ISSN 2313-433X ISBN Medium
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Call Number GFZ @ kyba @ Serial 2327
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Author Gu, Y., Uprety, S., Blonski, S., Zhang, B., & Cao, C.
Title Improved algorithm for determining the Visible Infrared Imaging Radiometer Suite Day/Night Band high-gain stage dark offset free from light contamination Type Journal Article
Year 2019 Publication Applied Optics Abbreviated Journal
Volume 58 Issue 6 Pages 1400-1407
Keywords Remote Sensing; Instrumentation
Abstract Dark offset is one of the key parameters for Visible Infrared Imaging Radiometer Suite (VIIRS) Day/Night Band (DNB) high-gain stage (HGS) radiometric calibration, whose accuracy strongly impacts applications of DNB low-light detection for Earth observation at nighttime. Currently, DNB observation of the VIIRS onboard calibrator blackbody (OBCBB) view, together with its observation of deep space during the spacecraft pitch maneuver performed early in the mission, has been used to compute the HGS dark offset continuously. However, the relationship between the DNB OBCBB data and the Earth view (EV) data is unclear due to electronic timing differences between these two views. It is questionable whether the DNB OBCBB data can monitor the EV HGS dark offset change. Through comprehensive analysis of the DNB OBCBB data and EV data acquired from the monthly special acquisitions known as the VIIRS recommended operating procedures (VROPs), we have shown that the OBCBB data can only track the dark current component of the DNB HGS EV dark offset, instead of the total dark offset. The DNB observation of deep space during the spacecraft pitch maneuver was also contaminated by starlight. With such background, in this paper we propose an improved algorithm for determining the DNB HGS dark offset. By combined use of the DNB OBCBB data and the DNB VROP data, the generated DNB HGS dark offset is both free from light contamination and capable of tracking continuous drift. The improved algorithm could potentially improve the DNB radiometric performance at low radiance level. Our results provide a solid theoretical basis for dark offset calibration of the VIIRS DNB onboard Suomi National Polar-Orbiting Partnership satellite and the following Joint Polar Satellite System satellites.
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Call Number IDA @ intern @ Serial 2358
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Author Rayleigh, L.
Title A Photoelectric Method of Measuring the Light of the Night Sky with Studies of the Course of Variation through the Night Type Journal Article
Year 1929 Publication Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences Abbreviated Journal Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences
Volume 124 Issue 794 Pages 395-408
Keywords Instrumentation; Night Sky Brightness
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ISSN 1364-5021 ISBN Medium
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Notes Approved no
Call Number GFZ @ kyba @ Serial 2396
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Author Elvey, C.T.; Roach, F.E.
Title A Photoelectric Study of the Light from the Night Sky Type Journal Article
Year 1937 Publication The Astrophysical Journal Abbreviated Journal ApJL
Volume 85 Issue Pages 213
Keywords Instrumentation; Sky Brightness
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Series Editor Series Title Abbreviated Series Title
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ISSN 0004-637X ISBN Medium
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Notes Approved no
Call Number GFZ @ kyba @ Serial 2399
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