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Author |
Bennett, M.M. |
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Title |
Is a pixel worth 1000 words? Critical remote sensing and China's Belt and Road Initiative |
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Journal Article |
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Year |
2020 |
Publication |
Political Geography |
Abbreviated Journal |
Political Geography |
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Volume |
78 |
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Pages |
102127 |
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Keywords |
Remote Sensing |
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Abstract |
As a novel means of researching China's Belt and Road Initiative (BRI), this article advances a critical remote sensing agenda that connects the view from above provided by satellite imagery with the grounded, qualitative methodologies more typical of political geography such as ethnographic fieldwork. Satellite imagery is widely used to produce empirics relating to the BRI, and the Chinese state is showing increasing interest in applying Earth observation data to governance. A more critical approach attentive to the politics of remote sensing, especially in light of China's emergence as a space and satellite power and its embrace of big data, is needed to more precisely reveal what changing pixels represent on the ground and expose the potential issues with data captured from high above the planet. This paper offers three theoretical and methodological objectives for critical remote sensing. First, I reflect on the geopolitics involved in the production and analysis of satellite imagery. Second, through analysis of night light imagery, which captures illuminated anthropogenic activities, I interrogate metanarratives of development. Third, I engage with qualitative methods by “ground-truthing” remote sensing with ethnographic observations along China's borders. I also seek to avoid the methodological nationalism often present in remote sensing research by situating these mixed-methods case studies at scales above and below the nation-state. As one of the largest development interventions in history materializes, pursuing critical remote sensing can create opportunities for social scientists to leverage quantitative and geospatial methods in support of more equitable and sustainable futures. |
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0962-6298 |
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GFZ @ kyba @ |
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3376 |
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Author |
Wang, R.; Shi, W.; Dong, P. |
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Title |
Mapping Dragon Fruit Croplands from Space Using Remote Sensing of Artificial Light at Night |
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Journal Article |
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Year |
2020 |
Publication |
Remote Sensing |
Abbreviated Journal |
Remote Sensing |
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12 |
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24 |
Pages |
4139 |
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Keywords |
NTL remote sensing; nighttime light; NPP-VIIRS; dragon fruit; Vietnam; VIIRS |
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Abstract |
The nighttime light (NTL) on the surface of Earth is an important indicator for the human transformation of the world. NTL remotely sensed data have been widely used in urban development, population estimation, economic activity, resource development and other fields. With the increasing use of artificial lighting technology in agriculture, it has become possible to use NTL remote sensing data for monitoring agricultural activities. In this study, National Polar Partnership (NPP)-Visible Infrared Imaging Radiometer Suite (VIIRS) NTL remote sensing data were used to observe the seasonal variation of artificial lighting in dragon fruit cropland in Binh Thuan Province, Vietnam. Compared with the statistics of planted area, area having products and production of dragon fruit by district in the Statistical Yearbook of Binh Thuan Province 2018, values of the mean and standard deviation of NTL brightness have significant positive correlations with the statistical data. The results suggest that the NTL remotely sensed data could be used to reveal some agricultural productive activities such as dragon fruits production accurately by monitoring the seasonal artificial lighting. This research demonstrates the application potential of NTL remotely sensed data in agriculture. |
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College of Forestry, Beijing Forestry University, Beijing 100083, China; ruiwang ( at ) bjfu.edu.cn |
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MDPI |
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English |
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English |
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2072-4292 |
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IDA @ john @ |
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3375 |
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Grose, M.J.; Jones, T.M. |
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Title |
The Impacts of Artificial Light at Night on Urban Ecosystems |
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2020 |
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The Routledge Handbook of Urban Ecology |
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Ecology; Review |
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Routledge |
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Douglas, I.; Anderson, P.M.L.; Goode, D.; Houck, M.C.; Maddox, D.; Nagendra, H.; Tan, P.Y. |
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English |
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English |
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Routledge Handbooks |
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2nd |
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9781138581357 |
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IDA @ john @ |
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3374 |
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Kupprat, F.; Kloas, W.; Krüger, A.; Schmalsch, C.; Hölker, F.; Cooke, S. |
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Title |
Misbalance of thyroid hormones after two weeks of exposure to artificial light at night in Eurasian perchPerca fluviatilis |
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Journal Article |
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Year |
2020 |
Publication |
Conservation Physiology |
Abbreviated Journal |
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9 |
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1 |
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Keywords |
Animals; Fishes; Perca fluviatilis; thyroid; physiology; 3,3′,5-triiodo-L-thyronine; L-thyroxine; T3; T4; metabolism |
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Artificial light at night (ALAN) can affect the physiology and behavior of animals because it alters the natural rhythm of light and darkness. Thyroid hormones (TH) are partially regulated by the light information of photoperiod and are involved in metabolic adjustments to daily and seasonal changes in the environment, such as larval and juvenile development, somatic growth and reproduction. ALAN can change photoperiodic information and might thereby lead to changes in thyroid metabolism, but so far research on this topic is scarce. Therefore, we tested in two different experiments the effects of nocturnal illumination at a wide range of light intensities on TH in plasma of Eurasian perch (Perca fluviatilis). Total 3,3′,5-triiodo-L-thyronine (T3) was significantly affected by ALAN and reduced at the highest tested intensity of 100 lx after only two weeks of exposure. Although total L-thyroxine (T4) was not significantly affected, the ratio of T3 to T4 tended to slightly decrease at 100 lx. In a second low-light experiment ALAN did not have clear effects on T3, T4 or the ratio of T3 to T4 at intensities between 0.01 lx and 1 lx. The results show first signs of endocrine disruption in thyroid metabolism after a relatively short ALAN exposure of two weeks under high-intensity streetlight conditions. Misbalanced thyroidal status can have serious implications for metabolic rates as well as developmental and reproductive processes. |
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Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Müggelseedamm 310, 12587 Berlin, Germany; kupprat ( at ) igb-berlin.de |
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Oxford Academic |
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English |
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English |
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2051-1434 |
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no |
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Call Number |
IDA @ john @ |
Serial |
3373 |
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Author |
Stebelova, K.; Roska, J.; Zeman, M. |
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Title |
Impact of Dim Light at Night on Urinary 6-Sulphatoxymelatonin Concentrations and Sleep in Healthy Humans |
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Journal Article |
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Year |
2020 |
Publication |
International Journal of Molecular Sciences |
Abbreviated Journal |
Int J Mol Sci |
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21 |
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20 |
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Human Health; 6-sulphatoxymelatonin; Alan; aMT6s/creatinine; chronodisruption; circadian; light pollution; melatonin; sleep quality |
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Artificial light at night can have negative effects on human wellbeing and health. It can disrupt circadian rhythms, interfere with sleep, and participate in the progress of civilisation diseases. The aim of the present study was to explore if dim artificial light during the entire night (ALAN) can affect melatonin production and sleep quality in young volunteers. We performed two experiments in real-life home-based conditions. Young volunteers (n = 33) were exposed to four nights of one lux ALAN or two nights of five lux ALAN. Melatonin production, based on 6-sulphatoxymelatonin/creatinine concentrations in urine, and sleep quality, based on actimetry, were evaluated. Exposure to ALAN one lux during the entire night did not suppress aMT6s/creatinine concentrations but did aggravate sleep quality by increasing sleep fragmentation and one-minute immobility. ALAN up to five lux reduced melatonin biosynthesis significantly and interfered with sleep quality, as evidenced by an increased percentage of one-minute immobility and a tendency of increased fragmentation index. Our results show that people are more sensitive to low illuminance during the entire night, as previously expected. ALAN can interfere with melatonin production and sleep quality in young, healthy individuals, and both processes have different sensitivities to light. |
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Address |
Department of Animal Physiology and Ethology, Faculty of Natural Sciences, Comenius University, Ilkovicova 6, 842 15 Bratislava, Slovakia; katarina.stebelova ( at ) uniba.sk |
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MDPI |
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English |
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English |
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1422-0067 |
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PMID:33086713; PMCID:PMC7588991 |
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IDA @ john @ |
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3372 |
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