Results 71 to 80 of about 1,227 (193)

Comparative Analysis of Mainstream ISB Stochastic Model Characteristics for Enhancing GNSS PPP With Wuhan University Precise Products

IET Radar, Sonar &Navigation, Volume 20, Issue 1, January/December 2026.
This study focuses on the critical challenge of selecting an overall optimal ISB stochastic model to improve GNSS PPP performance, which establishes a comprehensive assessment framework integrating positioning accuracy, convergence time, ISB characteristics, residual analysis, correlation metrics and physical mechanism interpretation.
Ban Zhao
wiley   +1 more source

Atmospheric Water Vapor and Precipitation Coupling in Southwestern South America

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Most studies linking atmospheric water vapor and precipitation emphasize short records, tropical regions, or the Northern Hemisphere. Long‐term variability of water vapor and its coupling with precipitation remain poorly understood across strong latitudinal and climatic gradients.
Raúl Valenzuela, Jorge Jara, Cristian Martinez‐Villalobos   +2 more
wiley   +1 more source

Satellite Geodesy Reveals Shallow, Transient Magma Intrusions at Sotará Volcano, Colombia

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 12, December 2025.
Abstract Sotará is a little‐known andesitic‐dacitic stratovolcano in southwestern Colombia. Although there are no recorded historical eruptions, the volcano shows clear evidence of geothermal activity, deformation, and volcano‐tectonic seismicity. Its remote location and rugged terrain pose challenges for access and routine monitoring.
Rosa Alpala, Jorge Alpala, Patricia A. Rosell, Leonardo D. Euillades, Pablo A. Euillades, Maurizio Battaglia   +5 more
wiley   +1 more source

Regional Tropospheric Delay Prediction Model Based on LSTM-Enhanced Encoder Network

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Precise modeling of zenith tropospheric delay (ZTD) is essential for real-time high-precision positioning in global navigation satellite systems. Due to the stochastic variability of atmospheric water vapor across different regions, tropospheric delay ...
Yuanfang Peng, Chenglin Cai, Zexian Li, Kaihui Lv, Xue Zhang, Yihao Cai   +5 more
doaj   +1 more source

Prescription Opioid Misuse and the Perceived Likelihood of Future Suicidal Behavior: Considering the Role of Suicide Capability Dimensions

Suicide and Life-Threatening Behavior, Volume 55, Issue 6, December 2025.
ABSTRACT Introduction In the past two decades, suicide attempts and deaths involving prescription opioids have sharply increased. Research is needed to understand how prescription opioid misuse may increase suicide risk. Contemporary suicide theories suggest opioid use may increase suicide capability by increasing pain tolerance, altering fears related
Zachary T. DeMoss, Matthew T. Tull, Kim L. Gratz   +2 more
wiley   +1 more source

Analisis nilai Zenith Tropospheric Delay (ZTD) menggunakan Data CORS di wilayah Jawa Timur tahun 2015-2018 [PDF]

, 2020
Global Navigation Satellite System (GNSS) kini dikembangkan sebagai sistem penginderaan jauh atmosfer melalui perhitungan Zenith Tropospheric Delay (ZTD). Salah satu komponen dalam ZTD adalah Zenith Wet Delay (ZWD). ZWD dipengaruhi oleh kandungan uap air
Mannani, Norma Aji Cemara
core  

Retrieval of Six Years of ZTD Over the Oceans from a French Oceanographic Fleet Vessel Shipborne GNSS Antenna [PDF]

, 2022
International audienceThe late 90s came with the development of high precision positioning, when GNSS (Global Navigation Satellite System) antennas have become essential elements. Their scope has broadened, allowing to compute atmospheric data above land,
Khenchaf, Ali, Tsapong-Tsague, Aubin Bleriot, Bosser, Pierre, Panetier, Aurélie   +3 more
core  

The VMD-Informer-BiLSTM-EAA Hybrid Model for Predicting Zenith Tropospheric Delay

Remote Sensing
Zenith Tropospheric Delay (ZTD) is a significant source of atmospheric error in the Global Navigation Satellite System (GNSS). Developing a high-accuracy ZTD prediction model is essential for both GNSS positioning and GNSS meteorology.
Zhengdao Yuan, Xu Lin, Yashi Xu, Ruiting Dai, Cong Yang, Lunwei Zhao, Yakun Han   +6 more
doaj   +1 more source

Mesoscale GPS Zenith Delay assimilation during a Mediterranean heavy precipitation event [PDF]

Advances in Geosciences, 2008
The impact of assimilating Zenith Total delay (ZTD) observations from a mesoscale ground-based GPS network over Western Europe is evaluated for the heavy precipitation event of 5–9 September 2005 over Southern France.
X. Yan, V. Ducrocq, P. Poli, G. Jaubert, A. Walpersdorf   +4 more
doaj  

A New Zenith Tropospheric Delay Grid Product for Real-Time PPP Applications over China

Sensors, 2017
Tropospheric delay is one of the major factors affecting the accuracy of electromagnetic distance measurements. To provide wide-area real-time high precision zenith tropospheric delay (ZTD), the temporal and spatial variations of ZTD with altitude were ...
Yidong Lou, Jinfang Huang, Weixing Zhang, Hong Liang, Fu Zheng, Jingnan Liu   +5 more
doaj   +1 more source