Results 91 to 100 of about 5,886 (223)

Reduction of ZTD outliers through improved GNSS data processing and screening strategies [PDF]

Atmospheric Measurement Techniques, 2017
Abstract. Though Global Navigation Satellite System (GNSS) data processing has been significantly improved over the years, it is still commonly observed that zenith tropospheric delay (ZTD) estimates contain many outliers which are detrimental to meteorological and climatological applications.
Katarzyna Stepniak, Olivier Bock, Pawel Wielgosz   +2 more
openaire   +3 more sources

Improving Species Distribution Models for Stream Networks by Incorporating Spatial Autocorrelation in Multi‐Sourced Datasets: A Range‐Wide Assessment of Idaho Giant Salamander Status and Future Risk

Diversity and Distributions, Volume 31, Issue 9, September 2025.
ABSTRACT Aim Fundamental to species conservation efforts is the development of accurate distribution models. Doing so is challenging for many stream organisms, where limited funding may necessitate the compilation of incidental observations from multiple sources which lack an overall sampling design and are often spatially clustered. We demonstrate the
Daniel J. Isaak, Michael Dumelle, Dona L. Horan, Daniel H. Mason, Thomas W. Franklin, David E. Nagel, Jay M. Ver Hoef, Michael K. Young   +7 more
wiley   +1 more source

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  

Modeling and Forecasting the GPS Zenith Troposphere Delay in West Antarctica Based on Different Blind Source Separation Methods and Deep Learning

Sensors, 2020
Tropospheric delay is an important error source in global positioning systems (GPS), and the water vapor retrieved from the tropospheric delay is widely used in meteorological research such as climate analysis and weather forecasting.
Qingchuan Zhang, Fei Li, Shengkai Zhang, Wenhao Li   +3 more
doaj   +1 more source

Local stability and a renormalized Newton Method for equilibrium liquid crystal director modeling [PDF]

, 2012
We consider the nonlinear systems of equations that result from discretizations of a prototype variational model for the equilibrium director field characterizing the orientational properties of a liquid crystal material.
Gartland, Jr, E.C., Ramage, Alison
core  

GNSS Real-Time ZTD/PWV Retrieval Based on PPP with Broadcast Ephemerides

Atmosphere
GNSS precise point positioning (PPP) plays an important role in retrieving atmospheric water vapor values and performing numerical weather prediction. However, traditional PPP relies on real-time orbits and clocks, which require continuous internet or ...
Zongqiu Xu, Shuhao Liu, Yantian Xu, Longjiang Tang, Nannan Yang, Gen Zhang   +5 more
semanticscholar   +1 more source

Heterointerface‐Modulated Synthetic Synapses Exhibiting Complex Multiscale Plasticity

Advanced Science, Volume 12, Issue 30, August 14, 2025.
An asymmetric dual‐gate heterointerface‐regulated artificial synapse (HRAS) is developed, employing distinct ion concentrations and dielectric coupling to form precise dual‐interface channels. Through lateral modulation, HRAS realizes, for the first time, the intricate interplay of lateral inhibition/enhancement and multi‐level short‐ and long‐term ...
Xingji Liu, Yao Ni, Zujun Wang, Sunfu Wei, Xiao′en Chen, Jingjie Lin, Lu Liu, Boyang Yu, Yue Yu, Dengyun Lei, Yayi Chen, Jianfeng Zhang, Jing Qi, Wei Zhong, Yuan Liu   +14 more
wiley   +1 more source

Optimizing PPP Performance by Incorporating ZWD Constraints Derived From Data Assimilation

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract One of the primary error sources limiting the performance of the Precise Point Positioning (PPP) technique is the atmospheric wet delay, caused by the presence of water vapor in the lower atmosphere. Accurately representing this parameter is crucial for improving the initialization and accuracy of satellite‐based positioning techniques ...
Masoud Dehvari, Saeed Farzaneh, Ehsan Forootan   +2 more
wiley   +1 more source

Zenith Tropospheric Delay Forecasting in the European Region Using the Informer–Long Short-Term Memory Networks Hybrid Prediction Model

Atmosphere
Zenith tropospheric delay (ZTD) is a significant atmospheric error that impacts the Global Navigation Satellite System (GNSS). Developing a high-precision, long-term forecasting model for ZTD can provide valuable insights into the overall trends of ...
Zhengdao Yuan, Xu Lin, Yashi Xu, Jie Zhao, Nage Du, Xiaolong Cai, Mengkui Li   +6 more
doaj   +1 more source