Results 81 to 90 of about 3,302 (221)

Near‐ground microwave radiometry for on‐the‐go surface soil moisture sensing in micro‐irrigated orchards in California

Agrosystems, Geosciences &Environment, Volume 8, Issue 3, September 2025.
Abstract High‐resolution geospatial soil moisture measurements are needed to inform hydrological modeling and to guide water management in agriculture, especially in highly heterogeneous systems such as micro‐irrigated orchards. In this research, we used a Portable L‐band Radiometer (PoLRa) to map very high‐resolution (<2 m) soil surface moisture in ...
Elia Scudiero, Amninder Singh, Gopal R. Mahajan, Dimitrios Chatziparaschis, Jayanta Banik, Konstantinos Karydis, Derek A. Houtz, Todd H. Skaggs   +7 more
wiley   +1 more source

Ground-based GNSS-R solutions by means of software defined radio [PDF]

, 2016
Usually ground-based GNSS-R installations are either existing geodetic GNSS stations or they are built with dedicated components that enable the deduction and monitoring of physical and geometrical properties of the reflecting area around that particular
Haas, Rüdiger, Hobiger, Thomas, Strandberg, Joakim   +2 more
core   +1 more source

Helmert Variance Component Estimation for Multi-GNSS Relative Positioning [PDF]

, 2020
The Multi-constellation Global Navigation Satellite System (Multi-GNSS) has become the standard implementation of high accuracy positioning and navigation applications.
Fang, Zhenlong, Mowen, Li, Nie, Wenfeng, Rovira Garcia, Adrià, Xu, Guochang, Xu, Tianhe   +5 more
core   +2 more sources

A Special Collection on Hydrogeodesy in a New Era of Satellites for Better Understanding and Management of Water Resources

Water Resources Research, Volume 61, Issue 9, September 2025.
Abstract Hydrogeodesy is the discipline that measures the Earth's solid and aquatic surfaces and gravity field from space to study water resources and their changes over time. The Special Collections on Hydrogeodesy: Understanding Changes in Water Resources Using Space Geodetic Observations, in Water Resources Research (WRR) and Geophysical Research ...
Fernando Jaramillo, Fabrice Papa, Jida Wang, Shimon Wdowinski, Georgia Destouni, James Famiglietti   +5 more
wiley   +1 more source

Analysis of GNSS Interference Events Based on TRITON GNSS-R Measurements

Navigation
Although the issue of global navigation satellite system (GNSS) interference has been addressed in the community of satellite navigation, the extent of GNSS interference in the past couple of years has raised serious concerns for air and marine ...
Jyh-Ching Juang, Yung-Fu Tsai
doaj   +1 more source

The Eddy Experiment: accurate GNSS-R ocean altimetry from low altitude aircraft

, 2004
During the Eddy Experiment, two synchronous GPS receivers were flown at 1 km altitude to collect L1 signals and their reflections from the sea surface for assessment of altimetric precision and accuracy.
Elfouhaily, F. Soulat, G. Ruffini, Lowe, Lowe, M. Caparrini, M. Martín-Neira, Martín-Neira, O. Germain, Picardi, Rius, Ruffini, Zavorotny   +12 more
core   +1 more source

Impact of rain, swell, and surface currents on the electromagnetic bias in GNSS-Reflectometry [PDF]

, 2016
The assessment of the electromagnetic (EM) bias is required to predict the performance of upcoming global navigation satellite systems-reflectometry (GNSS-R) altimetry systems, and its impact in data assimilation climate studies. In previous studies, the
Camps Carmona, Adriano José, Ghavidel, Ali   +1 more
core   +2 more sources

Regional Land Surface Conditions Developed Using the High‐Resolution Land Data Assimilation System: Challenges Over Complex Orography Himalayan Region

Meteorological Applications, Volume 32, Issue 4, July/August 2025.
High‐resolution land data assimilation system (HRLDAS) simulations at 2 km resolution from 2011 to 2021 over Uttarakhand. HRLDAS outperforms global and regional analyses by capturing finer spatial heterogeneity, with lower soil moisture error and high soil temperature correlation (0.94) against satellite and in situ observations.
Buri Vinodhkumar, Krishna Kishore Osuri, A. P. Dimri, Sandipan Mukherjee, Sami G. Al‐Ghamdi, Dev Niyogi   +5 more
wiley   +1 more source

Evaluating Water Levels From the Surface Water and Ocean Topography (SWOT) Mission in a Hyper‐Tidal Coastal and Estuarine Environment

Earth and Space Science, Volume 12, Issue 7, July 2025.
Abstract The launch of the Surface Water and Ocean Topography (SWOT) satellite in December 2022 started a new era of swath altimetry, introducing an unprecedented global data set of high‐resolution two‐dimensional water level imagery. During its initial calibration and validation phase (cal/val), SWOT conducted daily observations for 3 months providing
I. D. Lichtman, P. S. Bell, C. Gommenginger, C. Banks, F. M. Calafat, J. Brown, S. D. P. Williams   +6 more
wiley   +1 more source

Evaluating Impact of Rain Attenuation on Space-borne GNSS Reflectometry Wind Speeds [PDF]

, 2019
The novel space-borne Global Navigation Satellite System Reflectometry (GNSS-R) technique has recently shown promise in monitoring the ocean state and surface wind speed with high spatial coverage and unprecedented sampling rate.
Asgarimehr, Milad, Reich, Sebastian, Wickert, Jens   +2 more
core   +1 more source