Results 61 to 70 of about 285 (165)

The Impact of Gravity on Different Height Systems: A Case Study on Mt. Medvednica

Applied Sciences
This study examines the influence of gravity on different height systems by integrating Global Navigation Satellite Systems (GNSS), leveling, and gravimetric measurements.
Tedi Banković, Lucija Brajković, Antonio Banko, Marko Pavasović   +3 more
doaj   +1 more source

Analysis of different height systems along the Sava river

Geodesy and Cartography, 2012
The paper presents a project of renovating a levelling line from Hydroelectric Power Plant Medvode to Hydroelectric Power Plant Vrhovo. The levelling line is situated along the Sava River.
Božo Koler, Samo Jakljič, Aleš Breznikar   +2 more
doaj   +1 more source

Detection of Landslide‐Generated Tsunami by Shipborne GNSS Precise Point Positioning

Geophysical Research Letters, Volume 52, Issue 8, 28 April 2025.
Abstract Precise point positioning (PPP) of ships using Global Navigation Satellite System (GNSS) data reveals the precise movements of marine vessels. This method may quantify anomalies in sea surface height with implications for oceanographic monitoring, exploration, and tsunami warning. The GNSS PPP data from the R/V Sikuliaq, a research ship of the
Adam E. Manaster, Anne F. Sheehan, Dara E. Goldberg, Katherine R. Barnhart, Ethan H. Roth   +4 more
wiley   +1 more source

Derivation of Orthometric Heights from GPS Measured Heights Using Geometric Technique and EGM96 Model

FUTY Journal of the Environment, 2011
As a result of wide spread use of satellite based positioning techniques, especially Global Positioning System (GPS), a greater attention has been focused on precise determination of geoid models with an aim to replace the classical leveling with Global Navigation Satellite System (GNSS) measurements.
Opaluwa, YD, Adejare, QA
openaire   +3 more sources

Monitoring Water From Space: An Illustration in Death Valley, California

Geophysical Research Letters, Volume 52, Issue 5, 16 March 2025.
Abstract Climate change and human activity are dramatically reshaping how water is distributed on Earth. High quality observations and products that bridge the gap between low‐level data and actionable information are needed to support the understanding of current and future water availability. Two new developments are addressing these needs.
B. Buzzanga, B. D. Hamlington, D. P. S. Bekaert, T. Pavelsky, A. Handwerger, M. Bonnema, C. Lee   +6 more
wiley   +1 more source

The effect of topographic density variations on the geoid and orthometric heights in Hong Kong

Geodesy and Geodynamics
Utilizing the adopted average topographic density of 2670 kg/m3 in the reduction of gravity anomalies introduces errors attributed to topographic density variations, which consequently affect geoid modeling accuracy.
Albertini Nsiah Ababio
doaj   +1 more source

Decoding the Spatiotemporal Complexities of the Permafrost Carbon Feedback With Multimodal Ensemble Learning

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 1, March 2025.
Abstract Complex nonlinear relationships exist between the permafrost thermal state, active layer thickness, and terrestrial carbon cycle dynamics. In Arctic and boreal Alaska, significant uncertainties characterize the spatiotemporal rate and magnitude of permafrost degradation and the permafrost carbon feedback, with increasing recognition of the ...
B. A. Gay, N. J. Pastick, J. D. Watts, A. H. Armstrong, K. R. Miner, C. E. Miller   +5 more
wiley   +1 more source

Precise Cross-Sea Orthometric Height Determination Using GNSS Carrier-Phase Time-Frequency Transfer

Remote Sensing
State-of-the-art atomic clocks, in combination with high-precision time-frequency transfer techniques, have established a novel relativistic geodetic approach for determining the Earth’s geopotential.
Kuangchao Wu, Wen-Bin Shen, Ziyu Shen, Hok Sum Fok, Yanming Guo, Kezhao Li, Weitao Yan, Zengzeng Lian, Jinjiang Wang, Huijia Guo   +9 more
doaj   +1 more source

Towards a vertical datum standardisation under the umbrella of Global Geodetic Observing System

Journal of Geodetic Science, 2012
Most of the existing height systems refer to local sea surface levels, are stationary (do not consider variations in time), and realise different physical height types (orthometric, normal, normal-orthometric, etc.).
Sánchez L.
doaj   +1 more source

Quantification of the Flood Discharge Following the 2023 Kakhovka Dam Breach Using Satellite Remote Sensing

Water Resources Research, Volume 61, Issue 3, March 2025.
Abstract Fourteen months post the Ukrainian‐Russian war outbreak, the Kakhovka Dam collapsed, leading to weeks of catastrophic flooding. Yet, scant details exist regarding the reservoir draining process. By using a new technique for processing gravimetric satellite orbital observations, this study succeeded in recovering continuous changes in reservoir
Shuang Yi, Hao‐si Li, Shin‐Chan Han, Nico Sneeuw, Chunyu Yuan, Chunqiao Song, In‐Young Yeo, Christopher M. McCullough   +7 more
wiley   +1 more source