Results 41 to 50 of about 624,911 (207)

Multisurface Retracker for Swath Processing of Interferometric Radar Altimetry [PDF]

IEEE Geoscience and Remote Sensing Letters, 2019
Swath mode processing of CryoSat-2 Synthetic Aperture Radar Interferometric (SARIn) mode has been used to monitor elevation of areas with complex topography such as over ice sheet and ice cap margins. Swath processing relies on an accurate measure of the angle of arrival of the measured echo and, therefore, requires custom strategies in order to ...
Albert Garcia-Mondéjar, Noel Gourmelen, Maria José Escorihuela, Mònica Roca, Andrew Shepherd, Stephen Plummer   +5 more
openaire   +2 more sources

Deep Reinforcement Learning Based Autonomous Decision‐Making for Cooperative Uncrewed Aerial Vehicles: A Search and Rescue Real World Application

Journal of Field Robotics, Volume 43, Issue 7, Page 4382-4401, October 2026.
ABSTRACT This paper presents the first end‐to‐end framework that combines guidance, navigation, and centralized task allocation for multiple UAVs performing autonomous search‐and‐rescue (SAR) in GNSS‐denied indoor environments. A twin delayed deep deterministic policy gradient controller is trained with an artificial potential field (APF) reward that ...
Thomas Hickling, Maxwell Hogan, Abdulla Tammam, Nabil Aouf   +3 more
wiley   +1 more source

Improving the intercalibration of ?0 values for the Jason-1 and Jason-2 altimeters [PDF]

, 2009
The normalized backscatter from a radar altimeter, ?0, is a measure of the surface roughness at scales of a few radar wavelengths; over the ocean this is used to infer wind speed.
Quartly, Graham D.
core   +1 more source

A Regional Intercomparison of Ice Sheet Mass Balance Estimates of the Northwest Greenland Ice Sheet

Journal of Geophysical Research: Earth Surface, Volume 131, Issue 10, October 2026.
Abstract Changes in ice sheet mass manifest as changes in ice flow, ice thickness, and gravitational attraction. These parameters can be measured from space and used to track Greenland's contribution to sea level rise independently from each other. While an excellent level of agreement between these satellite techniques has been demonstrated at the ice
Inès N. Otosaka, Andrew Shepherd, Andreas Groh, Thorben Döhne, Xavier Fettweis, Brice Noël   +5 more
wiley   +1 more source

Evolution of the Performances of Radar Altimetry Missions from ERS-2 to Sentinel-3A over the Inner Niger Delta

Remote Sensing, 2018
Radar altimetry provides unique information on water stages of inland hydro-systems. In this study, the performance of seven altimetry missions, among the most commonly used in land hydrology (i.e., European Remote-Sensing Satellite-2 (ERS-2 ...
Cassandra Normandin, Frédéric Frappart, Adama Telly Diepkilé, Vincent Marieu, Eric Mougin, Fabien Blarel, Bertrand Lubac, Nadine Braquet, Abdramane Ba   +8 more
doaj   +1 more source

Enhancing Significant Wave Height Simulations Using Distribution‐Aware Deep Learning and Environmental Predictors

Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 5, October 2026.
Abstract Numerical wave models are widely used for wave forecasting and hindcast data set construction; however, their outputs frequently exhibit systematic biases stemming from uncertainties in wind forcing, physical parameterizations, and bathymetry. To address this issue, a deep learning–based bias correction approach is applied to significant wave ...
Jiageng Han, Shuiqing Li, Delei Li, Yong Fang, Zongyu Li, Jialin Liu, Po Hu   +6 more
wiley   +1 more source

Greenland Ice Sheet surface roughness from Ku- and Ka-band radar altimetry surface echo strengths [PDF]

The Cryosphere
Surface roughness is an important factor to consider when modelling mass changes at the Greenland Ice Sheet (GrIS) surface (i.e., surface mass balance, SMB).
K. M. Scanlan, A. Rutishauser, S. B. Simonsen   +2 more
doaj   +1 more source

SWOT Observations Reveal Basin‐Scale Reservoir Operating Patterns

Geophysical Research Letters, Volume 53, Issue 18, 28 September 2026.
Abstract The construction and operation of reservoirs have fundamentally modified the natural hydrograph globally. However, complex seasonal operating patterns remain opaque due to data scarcity, limiting the accuracy of hydrological modeling and water management.
Tan Chen, Jiasheng Li, Shiteng Fang, Pengfei Zhan, Chenyu Fan, Hui Zhang, Chunqiao Song   +6 more
wiley   +1 more source

Definition of ICESat Selection Criteria for their Use as Height References for TanDEM-X [PDF]

, 2010
The TanDEM X satellite synthetic aperture radar (SAR) mission has the goal to deliver a high-precision global digital elevation model (DEM). The X band SAR interferometry (InSAR)-derived DEMs contain absolute and relative height errors that have to be ...
Scheiber, Rolf, Bachmann, Markus, Krieger, Gerhard, Hueso Gonzalez, Jaime   +3 more
core   +1 more source

The Impact of Altimetry Corrections of Sentinel-3A Sea Surface Height in the Coastal Zone of the Northwest Atlantic

Remote Sensing, 2023
Corrections to altimeter-measured sea surface height anomalies (SSHA) have a larger proportional effect for synthetic aperture radar (SAR) altimetry than conventional, pulse-limited altimetry because of lower range noise.
Anrijs Abele, Sam Royston, Jonathan Bamber   +2 more
doaj   +1 more source