Results 31 to 40 of about 365 (171)

CYGNSS Surface Heat Flux Product Development [PDF]

Remote Sensing, 2019
Ocean surface heat fluxes play a significant role in the genesis and evolution of various marine-based atmospheric phenomena, from the synoptic scale down to the microscale. While in-situ measurements from buoys and flux towers will continue to be the standard in regards to surface heat flux estimates, they commonly have significant gaps in temporal ...
Juan A. Crespo, Derek J. Posselt, Shakeel Asharaf   +2 more
openaire   +2 more sources

Soil Moisture Content from GNSS Reflectometry Using Dielectric Permittivity from Fresnel Reflection Coefficients

Remote Sensing, 2020
Global Navigation Satellite Systems-Reflectometry (GNSS-R) has shown unprecedented advantages to sense Soil Moisture Content (SMC) with high spatial and temporal coverage, low cost, and under all-weather conditions.
Andres Calabia, Iñigo Molina, Shuanggen Jin   +2 more
doaj   +1 more source

Improved GPS-Based Single-Frequency Orbit Determination for the CYGNSS Spacecraft Using GipsyX

Navigation, 2023
This paper presents methods for the precise orbit determination (POD) of a satellite in the CYGNSS constellation based on available single-frequency GPS code and carrier measurements. The contributions include the development and evaluation of procedures
Alex V. Conrad, Penina Axelrad, Bruce Haines, Cinzia Zuffada, Andrew O’Brien   +4 more
doaj   +1 more source

Exploring CYGNSS mission for surface heat flux estimates and analysis over tropical oceans

Frontiers in Marine Science, 2022
The Cyclone Global Navigation Satellite System (CYGNSS) mission can measure sea surface wind over tropical oceans with unprecedented temporal resolution and spatial coverage, so as to estimate surface latent and sensible heat fluxes (LHF and SHF).
Xiaohui Li, Jingsong Yang, Jingsong Yang, Yunwei Yan, Yunwei Yan, Weiqiang Li, Weiqiang Li   +6 more
doaj   +1 more source

Comparison of SAR and CYGNSS Surface Water Extent Metrics

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing, 2022
Many sensors are suitable for accurate delineation of open water extent, but in vegetated environments, the vegetation canopy can obscure the presence of standing water from detection. Detecting inundation extent in these vegetated environments is especially critical for identifying flooding extent where surface water may exceed flood boundaries and ...
Bruce D. Chapman, Ilaria Mara Russo, Carmela Galdi, Mary Morris, Maurizio di Bisceglie, Cinzia Zuffada, Brandi Downs, Marco Lavalle, Eric Loria, Andrew J. O'Brien 0001   +9 more
openaire   +2 more sources

First Evidence of Mesoscale Ocean Eddies Signature in GNSS Reflectometry Measurements

Remote Sensing, 2020
Feasibility of sensing mesoscale ocean eddies using spaceborne Global Navigation Satellite Systems-Reflectometry (GNSS-R) measurements is demonstrated for the first time.
Mostafa Hoseini, Milad Asgarimehr, Valery Zavorotny, Hossein Nahavandchi, Chris Ruf, Jens Wickert   +5 more
doaj   +1 more source

Enhancing Spatial Resolution of GNSS-R Soil Moisture Retrieval through XGBoost Algorithm-Based Downscaling Approach: A Case Study in the Southern United States

Remote Sensing, 2023
The retrieval of soil moisture (SM) using the Global Navigation Satellite System-Reflectometry (GNSS-R) technique has become a prominent topic in recent years.
Qidi Luo, Yueji Liang, Yue Guo, Xingyong Liang, Chao Ren, Weiting Yue, Binglin Zhu, Xueyu Jiang   +7 more
doaj   +1 more source

The Correction Method of Water and Fresnel Reflection Coefficient for Soil Moisture Retrieved by CYGNSS

Remote Sensing, 2023
Spaceborne GNSS-R technology is a new remote sensing method for soil moisture monitoring. Focusing on the significant influence of water on the surface reflectivity of CYGNSS, this paper improved the removal method of water influence according to the ...
Qi Wang, Jiaojiao Sun, Xin Chang, Taoyong Jin, Jinguang Shang, Zhiyong Liu   +5 more
doaj   +1 more source

Sensitivity of Tropical Cyclone Forecasts to the Loss of Low Earth Orbit Satellite Observations

Journal of Geophysical Research: Atmospheres, Volume 131, Issue 9, 16 May 2026.
Abstract Tropical cyclones are among the most destructive natural hazards, impacting millions of people worldwide each year. Accurate and timely forecasts are therefore essential for effective preparedness and risk mitigation. Forecast skill depends on both the performance of numerical weather prediction models and the observations assimilated into the
Isaac Moradi, Satya Kalluri, Vijay Tallapragada, Yanqiu Zhu   +3 more
wiley   +1 more source

Introducing Reflected GNSS TEC Data Into ANCHOR Ionospheric Data Assimilation Model

Space Weather, Volume 24, Issue 5, May 2026.
Abstract ANCHOR is a novel data assimilation (DA) algorithm developed at the U.S. Naval Research Laboratory to improve ionospheric nowcasting by increasing accuracy and decreasing computational cost. As a parameterized DA model, ANCHOR represents the ionosphere using physical parameters such as the F2 layer peak (Nm $Nm$F2), which characterizes a ...
Brenna Royersmith, Victoriya V. Forsythe, Brian Breitsch, Meghan R. Burleigh, Kate A. Zawdie, Y. Jade Morton   +5 more
wiley   +1 more source