Results 51 to 60 of about 285 (165)

Airborne Lidar to Verify ICESat‐2 Arctic Summer Sea Ice Heights and Melt Pond Depths: Calibration and Validation Campaign, Greenland 2022

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract In July 2022, the National Aeronautics and Space Administration (NASA) funded an airborne lidar data acquisition campaign over the central Arctic Ocean to evaluate ICESat‐2 ATLAS (Ice, Cloud, and Land Elevation Satellite, Advanced Topographic Laser Altimeter System) retrievals of summer sea ice heights and melt pond characteristics.
Kutalmis Saylam, Aaron R. Averett, John R. Andrews, Shelby R. Short, Nathan T. Kurtz, Rachel L. Tilling   +5 more
wiley   +1 more source

Calving Mechanisms Inferred From Observations of Surface Depressions at Helheim Glacier, Greenland

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 10, October 2025.
Abstract Dynamical changes at the termini of tidewater glaciers may trigger sustained acceleration, thinning, and retreat, increasing a glacier's contribution to sea level rise. However, processes at the ice‐ocean interface occur across a range of spatial (cm to km) and temporal (minutes to years) scales, making these processes difficult to capture ...
Michael G. Shahin, Leigh A. Stearns, C. J. van der Veen, David C. Finnegan, Adam L. LeWinter, Sarah F. Child, Shad O’Neel, Howard Butler   +7 more
wiley   +1 more source

ICESat‐2 Coastal and Nearshore Bathymetry Product Algorithm Development

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract NASA's ICESat‐2 (Ice, Cloud and land Elevation Satellite‐2) satellite launched in 2018, carrying a single instrument, the Advanced Topographic Laser Altimeter System (ATLAS). The Level 1 science objectives of the mission focus primarily on the cryosphere, with specific interest in monitoring changes in polar ice sheets, glaciers and sea ice ...
Lori Magruder, Christopher Parrish, Jeff Perry, Matthew Holwill, J. P. Swinski, Keana Kief   +5 more
wiley   +1 more source

VIIRS Radiance Cluster Analysis in CrIS Observations for Enhanced Data Assimilation in NWP Models

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract The Cross‐track Infrared Sounder (CrIS) radiance data plays a crucial role in numerical weather prediction (NWP) models by providing essential atmospheric sounding information through data assimilation. However, challenges arise in handling subpixel cloud contamination within CrIS fields of view (FOVs), which can impact the accuracy of ...
Likun Wang, Lihang Zhou, Haibin Sun, Chris Burrow, Banghua Yan, Satya Kalluri   +5 more
wiley   +1 more source

Regional Mapping of the Geoid Using GNSS (GPS) Measurements and an Artificial Neural Network

Remote Sensing, 2011
The determination of the orthometric height from geometric leveling has practical difficulties that, despite a number of scientific and technological advances, passed a century without substantial modifications or advances.
Reginaldo Macedônio da Silva, Alessandro Reinhardt, Sérgio Florêncio de Souza, Marcelo Tomio Matsuoka, Mauricio Roberto Veronez   +4 more
doaj   +1 more source

Volcano‐Tectonic Crisis of Mayotte (2018–2022): A Deformation Model for Geodetic Applications

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract Volcano‐tectonic unrest during the 2018–2022 crisis of Mayotte (Comoros archipelago) generated an island‐wide surface displacement reaching ∼ ${\sim} $20 cm, with a relative (internal) deformation of the island of ∼ ${\sim} $10 cm. Correcting for these displacements, which exceed the required accuracy of geodetic network reference coordinates,
Raphaël Grandin, Xavier Collilieux, Inès Pasquier, Olivier Jamet   +3 more
wiley   +1 more source

Analysis and Accuracy Assessment of a New Global Nearshore ICESat‐2 Bathymetric Data Product

Earth and Space Science, Volume 12, Issue 8, August 2025.
Abstract Although designed primarily for cryospheric science objectives, NASA's ICESat‐2 satellite, which launched in 2018, quickly became recognized as the world's first spaceborne bathymetric lidar. Initially, there was no dedicated bathymetric data product for the mission, so researchers interested in using ICESat‐2 bathymetry developed their own ...
Christopher E. Parrish, Lori A. Magruder, Jeff Perry, Matthew Holwill, J. P. Swinski, Keana Kief   +5 more
wiley   +1 more source

Global Assessment of Lake Surface Morphology and Its Impact on Water Volume Estimation

Water Resources Research, Volume 61, Issue 7, July 2025.
Abstract Lake surface morphology, an essential yet underexplored feature of hydrological systems, remains poorly understood, including its effects on water volume estimation. This study investigates north‐south surface profiles of 147 lakes worldwide using ICESat‐2 altimetry data (2018–2024).
Jing Zhang, Dongli Ji, Futian Liu, Hang Ning   +3 more
wiley   +1 more source

The geoid or quasigeoid – which reference surface should be preferred for a national height system?

Journal of Geodetic Science, 2013
Most European states use M. S. Molodensky’s concept of normal heights for their height systems with a quasigeoid model as the reference surface, while the rest of the world rely on orthometric heights with the geoid as the zero-level.
Sjöberg L. E.
doaj   +1 more source

Current Subsidence Rates of the Mississippi River Delta From Satellite Radar Interferometry: Onshore and Offshore

Earth and Space Science, Volume 12, Issue 7, July 2025.
Abstract The Mississippi River Delta has long been recognized as an area experiencing substantial subsidence and land loss. Existing GNSS stations are quite sparse and there is no station at the Brid's Foot area and the delta front (offshore) where the Holocene sediment is the thickest.
Fanghui Deng
wiley   +1 more source