Results 31 to 40 of about 2,974 (193)

A Weighted Image-Point-Measurement Method of Laser Altimetry Points for Improving Laser-Altimetry-Data-Assisted Positioning Accuracy of Small-Satellite Images

Remote Sensing
For small-satellite imagery, traditional image points derived from the direct back-projection of laser altimetry points onto the imagery often exhibit deviations of tens of pixels or more, owing to the relatively limited attitude and orbit determination ...
Wenping Song, Ducheng Wu, Luyao Wang, Miao Li, Jie Han, Caitong Cai, Yang Wu, Fen Tang, Lei Wu   +8 more
doaj   +1 more source

Sea level accelerations at globally distributed tide gauge stations during the satellite altimetry era

Journal of Geodetic Science, 2018
This observational study reports that several globally distributed tide gauge stations exhibit a propensity of statistically significant sea level accelerations during the satellite altimetry era.
Iz H. Bâki, Shum C. K., Kuo C. Y.
doaj   +1 more source

Influence of Atmospheric Scattering on the Accuracy of Laser Altimetry of the GF-7 Satellite and Corrections

Remote Sensing, 2021
Satellite laser altimetry can obtain sub-meter or even centimeter-scale surface elevation data over large areas, but it is inevitably affected by scattering caused by clouds, aerosols, and other atmospheric particles.
Jiaqi Yao, Xinming Tang, Guoyuan Li, Jiyi Chen, Zhiqiang Zuo, Bo Ai, Shuaitai Zhang, Jinquan Guo   +7 more
doaj   +1 more source

Isolation, Insularity and Resilience: A Review of the Geophysical, Socioeconomic, and Environmental Vulnerabilities of Gran Canaria and Lesvos Islands for Policy Interventions to Global Change

Sustainable Development, EarlyView.
ABSTRACT The dynamic nature of small islands being geographically isolated and their perceived connectedness with global networks complicates research attempts to draw general conclusions on whether insularity leads to marginalization or strengthens their resilience for sustainable development.
Toheeb Lekan Jolaosho, Mazen Marouani, Takwa Boughanmi   +2 more
wiley   +1 more source

A first approach towards dual-hemisphere sea ice reference measurements from multiple data sources repurposed for evaluation and product intercomparison of satellite altimetry [PDF]

Earth System Science Data
Sea ice altimetry currently remains the primary method for estimating sea ice thickness from space, however, time series of such satellite-derived estimates are of limited use without having been quality-controlled against reference measurements.
I. L. Olsen, I. L. Olsen, H. Skourup, H. Sallila, S. Hendricks, R. M. Fredensborg Hansen, R. M. Fredensborg Hansen, S. Kern, S. Paul, M. Bocquet, S. Fleury, D. Divine, E. Rinne   +12 more
doaj   +1 more source

Waveform Aliasing in Satellite Radar Altimetry

IEEE Transactions on Geoscience and Remote Sensing, 2015
The full deramp pulse compression scheme employed by satellite radar altimeters digitizes each radar echo at a sampling rate matched to the chirp bandwidth. Echo power is undersampled by a factor of 2 when the power samples are simply obtained by squaring the magnitude of the echo samples, without first resampling, as is done in all altimeters to date.
Walter H. F. Smith, Remko Scharroo
openaire   +1 more source

Alluvial ridge morphology on avulsing rivers

Sedimentology, EarlyView.
ABSTRACT Alluvial ridges are built by preferential channel‐belt deposition and control river avulsions, yet a systematic analysis of their morphology has been missing. To address this gap, we analyse a globally distributed dataset of 8970 alluvial ridge flanks on 14 different rivers.
James H. Gearon, Douglas A. Edmonds
wiley   +1 more source

Floods From Space: How Remote Sensing, AI, and Cloud Platforms Are Reshaping Disaster Risk Reduction

Journal of Flood Risk Management, Volume 19, Issue 3, September 2026.
ABSTRACT Flooding remains one of the most damaging climate‐related hazards globally, yet flood remote sensing has historically developed largely along sensor‐specific pathways. This review addresses the need for a systematic and decision‐oriented synthesis of how space‐borne remote sensing has evolved toward integrated flood monitoring and disaster ...
Ricky Anak Kemarau, Nurfashareena Muhamad, Aida Soraya Shamsuddin, Zulfaqar Sa'adi, Zaini Sakawi, Oliver Valentine Eboy, Nik Norliati Fitri Md Nor   +6 more
wiley   +1 more source

Satellite Altimetry for Earth Sciences [PDF]

, 2019
Satellite altimetry is a radar technique for measuring the topography of the Earth’s surface. It was initially designed for measuring the ocean’s topography, with reference to an ellipsoid, and for the determination of the marine geoid. Satellite altimetry has provided extremely valuable information on ocean science (e.g., circulation surface ...
Lebedev, Sergey, Andersen, Ole, Frappart, Frédéric, Ramillien, Guillaume   +3 more
openaire   +3 more sources

Can satellite altimetry observe coastally trapped waves on sub-monthly timescales? [PDF]

Ocean Science
Coastally trapped waves (CTWs) are a major cause of sub-seasonal coastal sea level variability. While they have mostly been studied using numerical models, observational evidence is limited due to the sparse spatial coverage of the tide gauge network and
M. Passaro
doaj   +1 more source