Results 41 to 50 of about 30,906,623 (137)

Downscaling satellite night-time lights imagery to support within-city applications using a spatially non-stationary model

International Journal of Applied Earth Observations and Geoinformation, 2023
For mapping and monitoring socioeconomic activities in cities, night-time lights (NTL) satellite sensor images are used widely, measuring the light intensity during the night.
Nikolaos Tziokas, Ce Zhang, Garyfallos C. Drolias, Peter M. Atkinson   +3 more
doaj   +1 more source

Automatic built-up area extraction by feature-level fusion of Luojia 1–01 nighttime light and Sentinel satellite imageries in Google Earth Engine

Advances in Space Research, 2023
Today, with the non-stop expansion of urbanization, mapping urban areas and monitoring their dynamic changes have become challenges for governments and also a hot topic for researchers. Remote sensing imageries play a key role in urban studies, the extraction of urban built-up areas, and monitoring their changes.
Samadzadegan, Farhad, Toosi, Ahmad, Dadrass Javan, F.   +2 more
openaire   +1 more source

Monte Carlo Simulation of 3D Cloud Radiance Distributions Affected by Ground‐Based Lighting

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 6, 28 March 2026.
Abstract Satellite observations of artificial light sources at night are increasing. Clouds, as the most important radiative modulators in the Earth‐atmosphere system, significantly influence the observed values and spatial distribution of the artificial light coming from the ground.
Huixin Sun, Shensen Hu, Weihua Ai, Shuo Ma   +3 more
wiley   +1 more source

Fig 3 -

, 2022
(A) The Luojia 1–01 NTL imagery of Qingdao in 2018; (b) The EVI imagery of Qingdao in 2018. We used the bilinear interpolation algorithm to unify the spatial resolution of Luojia 1–01 NTL data (Fig 3A) and EVI data (Fig 3B) to 100m, and calculated HSI ...
Haifeng Han (12282671), Zhen Mao (3947357), Heng Zhang (320479), Bo Ai (5480270)   +3 more
core   +1 more source

Urban Impervious Surface Extraction Based on Multi-Features and Random Forest

IEEE Access, 2020
Impervious surface data has become an indicator of the degree of urbanization and the environmental quality, which inspires the widely use of remote sensing technology in extracting impervious surface.
Xiaojiao Guo, Chengcai Zhang, Weiran Luo, Jing Yang, Miao Yang   +4 more
doaj   +1 more source

ED‐Autoformer: A New Model for Precise Global TEC Forecast

Space Weather, Volume 23, Issue 6, June 2025.
Abstract Total electron content (TEC) is a key parameter for characterizing ionospheric morphology and significantly impacts the Global Navigation Satellite System. The ionosphere responds dramatically to solar and geomagnetic activity, leading to substantial TEC fluctuations and disturbances.
Jiawei Zhou, Hongtao Cai, Xu Yan, Hong‐wen Xu, Kun Hu, Chao Xiong   +5 more
wiley   +1 more source

How dark is a river? Artificial light at night in aquatic systems and the need for comprehensive night‐time light measurements

WIREs Water, Volume 6, Issue 6, November/December 2019., 2019
Artificial light at night can occur as a form of environmental pollution, light pollution, which also affects aquatic systems. We identify a knowledge gap of insufficient data regarding the status quo of aquatic light pollution and provide a route to fill this gap with in‐situ measurements.
Andreas Jechow, Franz Hölker
wiley   +1 more source

Measurements and Modeling of Electron Precipitation Induced by the Ionospheric Heating Experiment

Space Weather, Volume 23, Issue 3, March 2025.
Abstract Through the emission of high‐frequency radio waves, ground‐based heating facilities can generate Extremely‐Low‐Frequency (ELF) and Very‐Low‐Frequency (VLF) waves in the ionosphere, a portion of which can penetrate into the Earth's radiation belts and influence the electron population therein.
Haotian Xu, Wei Xu, Binbin Ni, Zheng Xiang, Xudong Gu, Poorya Hosseini, Zhima Zeren, Jianping Huang, Yanyan Yang, Yangxizi Liu, Taifeng Jin, Wen Cheng, Jingyuan Feng, Wenchen Ma, Yudi Pan   +14 more
wiley   +1 more source

Observations of the Electromagnetic Electron Kelvin‐Helmholtz Instability and Its Impact on the Dynamics Inside a Flux Rope

Geophysical Research Letters, Volume 52, Issue 1, 16 January 2025.
Abstract The electromagnetic electron Kelvin‐Helmholtz instability (EM EKHI) and its impact on the dynamics inside a flux rope (FR) is investigated through observations from the Magnetospheric Multiscale mission. The convection term dominated electric field drives E × B drift in the FR, which supports a strong electron shear flow.
K. Jiang, S. Y. Huang, Q. M. Lu, Z. G. Yuan, Q. Y. Xiong   +4 more
wiley   +1 more source

Observations of Energy Conversion Caused by Magnetic Reconnection at a Dipolarization Front

Geophysical Research Letters, Volume 51, Issue 6, 28 March 2024.
Abstract Dipolarization fronts (DFs) are widely believed to host energy conversion processes. However, which mechanism is responsible for the energy conversion is still obscure. Using data from the Magnetospheric Multiscale mission, a current sheet is observed at a DF.
K. Jiang, S. Y. Huang, Z. G. Yuan, Q. Y. Xiong, S. B. Xu, R. T. Lin   +5 more
wiley   +1 more source