Results 91 to 100 of about 1,220 (193)

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

Experiments with assimilation of ZTD GPS data

, 2004
Ponencia presentada en: HIRLAM All-Staff Meeting 2004 celebrado en Madrid, del 1 al 3 de marzo de 2004, en el Instituto Nacional de ...
Sánchez Arriola, Jana, Navascués, Beatriz, García-Moya, José Antonio   +2 more
openaire   +1 more source

A Zenith Tropospheric Delay Modeling Method Based on the UNB3m Model and Kriging Spatial Interpolation

Atmosphere
To accurately estimate Zenith Tropospheric Delay (ZTD) for high-precision positioning of the Global Navigation Satellite System (GNSS), this study proposes a modeling method of ZTD based on the UNB3m model and Kriging spatial interpolation, in which the ...
Huineng Yan, Zhigang Lu, Fang Li, Yu Li, Fuping Li, Rui Wang   +5 more
doaj   +1 more source

Atmospheric water vapor maps generations from stochastic interpolation of GNSS Zenith Tropospheric Delays [PDF]

, 2023
LAUREA MAGISTRALEIl monitoraggio degli eventi meteorologici nella moderna meteorologia richiede l'uso di tecniche avanzate, con I sistemi globali di navigazione satellitare (GNSS) che stanno emergendo come una soluzione importante.
ABDELGAFAR, OMAR SAYED MOSTAFA
core  

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

, 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  

ANALISIS NILAI ZENITH TROPOSPHERIC DELAY (ZTD) CORS ULPC UNILA DENGAN METODE PRECISE POINT POSITIONING (PPP)

The propagation of GNSS signals from satellites orbiting at an altitude of approximately 22,000 km above the Earth's surface to the receiver must pass through the Earth's atmosphere.
Fajriyanto, Rahmadi, Eko, Sari, Atika, Fadly, Romi   +3 more
core   +1 more source

Nowcasting convective storms with artificial neural network modeling based on GNSS ZTD and meteorological data

, 2021
LAUREA MAGISTRALELe piogge convettive sono connesse alla risalita di vapore acqueo, causata dal surriscaldamento delle superficie terrestre, verso gli strati più alti dell’atmossfera. Tali piogge possono innescare inondazioni e quindi provocare disastri
Mehdipour, Ehsan
core  

DESIGNATING THE ERROR OF VERTICAL COORDINATE OF AIRCRAFT POSITION IN THE GPS SYSTEM

Scientific Journal of Silesian University of Technology. Series Transport, 2020
This article presents the results of research concerning the determination of an error of the vertical position of an aircraft during a flight, taking into account, the flight altitude and the values of the ZTD tropospheric product.
Małgorzata KIRSCHENSTEIN, Kamil KRASUSKI, Artur GOŚ   +2 more
doaj   +1 more source

A New PatchTST-ZTD Forecasting Model Based on Different Global Climates and Its Performance in PPP

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Accurate modeling of zenith tropospheric delay (ZTD) is crucial for real-time high-precision positioning in global navigation satellite systems (GNSS). Deep learning methods are capable of effectively capturing the complex temporal patterns of ZTD time ...
Zhiping Chen, Hao Lu, Chiming Xu, Tao Liu, Haifeng Liu, Yu Gao, Haijun Yuan, Puhao Xu, Haiqing He, Kaiyun Lv   +9 more
doaj   +1 more source

An Interferometric Synthetic Aperture Radar Tropospheric Delay Correction Method Based on a Global Navigation Satellite System and a Backpropagation Neural Network: More Suitable for Areas with Obvious Terrain Changes. [PDF]

Sensors (Basel), 2023
Qiu L, Chen P, Yao Y, Chen H, Tang F, Xiong M.   +5 more
europepmc   +1 more source