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Bagan, H.; Borjigin, H.; Yamagata, Y. |
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Title |
Assessing nighttime lights for mapping the urban areas of 50 cities across the globe |
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Journal Article |
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Year |
2018 |
Publication |
Environment and Planning B: Urban Analytics and City Science |
Abbreviated Journal |
Environment and Planning B: Urban Analytics and City Science |
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2399808317752926 |
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Keywords |
Remote Sensing |
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Abstract |
Nighttime data from the Defense Meteorological Satellite Program Operational Linescan System have been widely used to map urban/built-up areas (hereafter referred to as “built-up area”), but to date there has not been a geographically comprehensive evaluation of the effectiveness of using nighttime lights data to map urban areas. We created accurate, convenient, and scalable grid cells based on Defense Meteorological Satellite Program/Operational Linescan System nighttime light pixels. We then calculated the density of Landsat-derived built-up areas within each grid cell. We explored the relationship between Defense Meteorological Satellite Program/Operational Linescan System nighttime lights data and the density of built-up areas to assess the utility of nighttime lights for mapping urban areas in 50 cities across the globe. We found that the brightness of nighttime lights was only in moderate agreement with the density of built-up areas; moreover, correlations between nighttime lights and Landsat-derived built-up areas were weak. Even in relatively sparsely populated urban regions (where the density of the built-up area is less than 20%), the highest correlation coefficient (R2) was only 0.4. Furthermore, nighttime lights showed lighted areas that extended beyond the area of large cities, and nighttime lights reduced the area of small cities. The results suggest that it is difficult to use the regression model to calibrate the Defense Meteorological Satellite Program/Operational Linescan System nighttime lights to fit urban built up areas. |
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2399-8083 |
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LoNNe @ kyba @; GFZ @ kyba @ |
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1795 |
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Author |
Bagan, H.; Yamagata, Y. |
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Analysis of urban growth and estimating population density using satellite images of nighttime lights and land-use and population data |
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Journal Article |
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2015 |
Publication |
GIScience & Remote Sensing |
Abbreviated Journal |
GIScience & Remote Sensing |
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52 |
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6 |
Pages |
765-780 |
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Remote Sensing |
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1548-1603 |
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LoNNe @ kyba @ |
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1234 |
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Bagci, S.; Sabir, H.; Muller, A.; Reiter, R.J. |
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Title |
Effects of altered photoperiod due to COVID-19 lockdown on pregnant women and their fetuses |
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Journal Article |
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Year |
2020 |
Publication |
Chronobiology International |
Abbreviated Journal |
Chronobiol Int |
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in press |
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in press |
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Human Health; Covid-19; circadian disruption; fetus; lockdown; melatonin; pregnant Women |
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Maternal circadian rhythms provide highly important input into the entrainment and programming of fetal and newborn circadian rhythms. The light-dark cycle is an important regulator of the internal biological clock. Even though pregnant women spend a greater part of the day at home during the latter stages of pregnancy, natural light exposure is crucial for the fetus. The current recommended COVID-19 lockdown might dramatically alter normal environmental lighting conditions of pregnant women, resulting in exposure to extremely low levels of natural daylight and high-intensity artificial light sources during both day and night. This article summarizes the potential effects on pregnant woman and their fetuses due to prolonged exposure to altered photoperiod and as consequence altered circadian system, known as chronodisruption, that may result from the COVID-19 lockdown. |
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Department of Cell Systems and Anatomy, UT Health San Antonio , San Antonio, Texas, USA |
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0742-0528 |
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PMID:32519912 |
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GFZ @ kyba @ |
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3007 |
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Bailey, F.; Sparks, C.P.; Seabrook, A.H.; Vignoles, W.A.; Trotter, A.P.; Gaster, L.; Cooper, W.R.; Shaw, C.M.; Morris, J.T.; Russell, C.N.; Edgcumbe, K.; Boot, H.L.P.; Dow, J.S.; Fedden, S.E.; Mackenzie, J.D.; Sexton, F.P.; Wilkinson, H.D.; Scott, E.K.; Hollis, E.P.; Pearce, S.L.; Frith, J.; Angus, H.W.; Cooper, A.G.; Moon, O.; Sells, F.; Crews, H.C.; Solomon, M.; Chattock, R.A.; Sumpner, W.E.; Augold, A.E.; Morcom, R.K.; Harrison, H.T. |
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Discussion on: “Street lighting by modern electric lamps” |
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Year |
1911 |
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Journal of the Institution of Electrical Engineers |
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46 |
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205 |
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46-91 |
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Lighting; Commentary |
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2054-0612 |
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GFZ @ kyba @ |
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2740 |
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Bailey, L.A.; Brigham, R.M.; Bohn, S.J.; Boyles, J.G.; Smit, B. |
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An experimental test of the allotonic frequency hypothesis to isolate the effects of light pollution on bat prey selection |
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Journal Article |
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2019 |
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Oecologia |
Abbreviated Journal |
Oecologia |
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190 |
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2 |
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367–374 |
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Animals; Ecology; bats; moths; insects; mammals |
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Artificial lights may be altering interactions between bats and moth prey. According to the allotonic frequency hypothesis (AFH), eared moths are generally unavailable as prey for syntonic bats (i.e., bats that use echolocation frequencies between 20 and 50 kHz within the hearing range of eared moths) due to the moths' ability to detect syntonic bat echolocation. Syntonic bats therefore feed mainly on beetles, flies, true bugs, and non-eared moths. The AFH is expected to be violated around lights where eared moths are susceptible to exploitation by syntonic bats because moths' evasive strategies become less effective. The hypothesis has been tested to date almost exclusively in areas with permanent lighting, where the effects of lights on bat diets are confounded with other aspects of human habitat alteration. We undertook diet analysis in areas with short-term, localized artificial lighting to isolate the effects of artificial lighting and determine if syntonic and allotonic bats (i.e., bats that use echolocation frequencies outside the hearing range of eared moths) consumed more moths under conditions of artificial lights than in natural darkness. We found that syntonic bats increased their consumption of moth prey under experimentally lit conditions, likely owing to a reduction in the ability of eared moths to evade the bats. Eared moths may increase in diets of generalist syntonic bats foraging around artificial light sources, as opposed to allotonic species and syntonic species with a more specialized diet. |
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Department of Zoology and Entomology, Rhodes University, P.O. Box 94, Grahamstown, 6140, South Africa. b.smit@ru.ac.za |
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0029-8549 |
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Notes |
PMID:31139944 |
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GFZ @ kyba @ |
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2511 |
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