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Li, X.; Ma, R.; Zhang, Q.; Li, D.; Liu, S.; He, T.; Zhao, L. |
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Title |
Anisotropic characteristic of artificial light at night – Systematic investigation with VIIRS DNB multi-temporal observations |
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Journal Article |
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Year |
2019 |
Publication |
Remote Sensing of Environment |
Abbreviated Journal |
Remote Sensing of Environment |
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233 |
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111357 |
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Keywords |
Remote Sensing; Instrumentation |
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Abstract |
The released VIIRS DNB nightly images, also known as VIIRS DNB daily nighttime images, provide rich information for time series analysis of global socioeconomic dynamics. Anisotropic characteristic is a possible factor that influences the VIIRS DNB radiance at night and its time series analysis. This study aims to investigate the relationship between viewing angles and VIIRS DNB radiance of Suomi NPP satellite in urban areas. First, twenty-nine points were selected globally to explore the angle variation of Suomi NPP satellite views at night. We found that the variation of the satellite viewing zenith angle (VZA) is consistent (e.g. between 0° and 70°) since the range of VZA is fixed depending on the sensor design, and the range of viewing azimuth angle (VAA) increases with the increase of latitude. Second, thirty points in cities of Beijing, Houston, Los Angeles, Moscow, Quito and Sydney, were used to investigate the angle-radiance relationship. We proposed a zenith-radiance quadratic (ZRQ) model and a zenith-azimuth-radiance binary quadratic (ZARBQ) model to quantify the relationship between satellite viewing angles and artificial light radiance, which has been corrected by removing the moonlight and atmospheric impact from VIIRS DNB radiance products. For all the thirty points, the ZRQ and ZARBQ analysis have averaged R2 of 0.50 and 0.53, respectively, which indicates that the viewing angles are important factors influencing the variation of the artificial light radiance, but extending zenith to zenith-azimuth does not much better explain the variation of the observed artificial light. Importantly, based on the data analysis, we can make the hypothesis that building height may affect the relationship between VZA and artificial light, and cold and hot spot effects are clearly found in tall building areas. These findings are potentially useful to reconstruct more stable time series VIIRS DNB images for socioeconomic applications by removing the angular effects. |
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0034-4257 |
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GFZ @ kyba @ |
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2621 |
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Li, X.; Zhao, L.; Li, D.; Xu, H. |
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Title |
Mapping Urban Extent Using Luojia 1-01 Nighttime Light Imagery |
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Journal Article |
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Year |
2018 |
Publication |
Sensors (Basel, Switzerland) |
Abbreviated Journal |
Sensors (Basel) |
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18 |
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11 |
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Instrumentation; Remote Sensing |
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Luojia 1-01 satellite, launched on 2 June 2018, provides a new data source of nighttime light at 130 m resolution and shows potential for mapping urban extent. In this paper, using Luojia 1-01 and VIIRS nighttime light imagery, we compared several methods for extracting urban areas, including Human Settlement Index (HSI), Simple Thresholding Segmentation (STS) and SVM supervised classification. According to the accuracy assessment, the HSI method using LJ1-01 data had the best performance in urban extent extraction, which presented the largest Kappa Coefficient value, 0.834, among all the results. For the urban areas extracted by VIIRS based HSI method, the largest Kappa Coefficient value was 0.772. In contrast, the largest Kappa Coefficient values obtained by STS method were 0.79 and 0.7512 respectively when using LJ1-01 and VIIRS data, while for SVM method the values were 0.7829 and 0.7486 when using Landsat-LJ and Landsat-VIIRS composite data respectively. The experimented results demonstrated that the utilization of nighttime light imagery can largely improve the accuracy of urban extent extraction and LJ1-01 data, with a higher resolution and more abundant spatial information, can lead to better identification results than its predecessors. |
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Key Laboratory of the Ministry of Land and Resources for Law Evaluation Engineering, Wuhan 430074, China. xuhuimin1985_2008@163.com |
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1424-8220 |
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PMID:30380616 |
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GFZ @ kyba @ |
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2056 |
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Longcore, T.; Rich, C.; Mineau, P.; MacDonald, B.; Bert, D.G.; Sullivan, L.M.; Mutrie, E.; Gauthreaux, S.A.J.; Avery, M.L.; Crawford, R.L.; Manville, A.M. 2nd; Travis, E.R.; Drake, D. |
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An estimate of avian mortality at communication towers in the United States and Canada |
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2012 |
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PloS one |
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PLoS One |
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7 |
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4 |
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e34025 |
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Ecology; Accidents/*statistics & numerical data; Altitude; Animals; Birds/*injuries; Canada; Computer Communication Networks/*instrumentation; Conservation of Natural Resources/*statistics & numerical data; *Flight, Animal; *Mortality; Regression Analysis; United States |
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Avian mortality at communication towers in the continental United States and Canada is an issue of pressing conservation concern. Previous estimates of this mortality have been based on limited data and have not included Canada. We compiled a database of communication towers in the continental United States and Canada and estimated avian mortality by tower with a regression relating avian mortality to tower height. This equation was derived from 38 tower studies for which mortality data were available and corrected for sampling effort, search efficiency, and scavenging where appropriate. Although most studies document mortality at guyed towers with steady-burning lights, we accounted for lower mortality at towers without guy wires or steady-burning lights by adjusting estimates based on published studies. The resulting estimate of mortality at towers is 6.8 million birds per year in the United States and Canada. Bootstrapped subsampling indicated that the regression was robust to the choice of studies included and a comparison of multiple regression models showed that incorporating sampling, scavenging, and search efficiency adjustments improved model fit. Estimating total avian mortality is only a first step in developing an assessment of the biological significance of mortality at communication towers for individual species or groups of species. Nevertheless, our estimate can be used to evaluate this source of mortality, develop subsequent per-species mortality estimates, and motivate policy action. |
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The Urban Wildlands Group, Los Angeles, California, United States of America. longcore@urbanwildlands.org |
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1932-6203 |
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PMID:22558082; PMCID:PMC3338802 |
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LoNNe @ christopher.kyba @ |
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475 |
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Ma, S.; Yan, W.; Huang, Y.-X.; Ai, W.-H.; Zhao, X. |
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Vicarious calibration of S-NPP/VIIRS day-night band using deep convective clouds |
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2015 |
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Remote Sensing of Environment |
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Remote Sensing of Environment |
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158 |
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42-55 |
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Instrumentation, Remote Sensing |
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0034-4257 |
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LoNNe @ christopher.kyba @ |
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1077 |
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Müller, A.; Wuchterl, G.; Sarazin, M. |
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Measuring the Night Sky Brightness with the Lightmeter. |
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Journal Article |
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2011 |
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ReVMexAA |
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41 |
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46–49 |
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Instrumentation; instrumentation: photometers; light pollution; methods: data analysis; methods: observational; site testing |
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We present a newly developed, low-cost photometer for long-term monitoring of the night sky brightness and
light pollution on Earth. The so-called Lightmeter is an as far as possible stand-alone operational, fully
weatherproof, and maintenance-free device. It provides a high data sampling rate of up to 1 Hz as well as a
superb sensitivity covering the whole brightness range down to the darkest night time conditions. The excellent
performance of the Lightmeter allows a continuously monitoring of the night sky brightness and opens a wide
range of applications at an observatory site like determining overall sky conditions in real time, cloud detection
and estimation of their velocity, measuring relative changes in extinction as well as the detection of long term
trends in brightness caused by an increase of artificial illumination. We will present first results of measurements
taken at Cerro Armazones, one of the best obser |
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LoNNe @ christopher.kyba @ |
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471 |
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