Results 21 to 30 of about 1,485 (143)

Estimation of vertical datum offset for the South African vertical datum, in relation to the international height reference system [PDF]

open access: yesGeodetski Vestnik, 2021
The vertical offset and the geopotential value over South Africa is estimated on the four fundamental benchmarks in relation to the international height reference system (IHRS).
Matthews Siphiwe Mphuthi   +1 more
doaj   +1 more source

High-Accuracy Quasi-Geoid Determination Using Molodensky's Series Solutions and Integrated Gravity/GNSS/Leveling Data

open access: yesRemote Sensing, 2023
This study presents a methodology for constructing a quasi-geoid model with millimeter-level accuracy over the Shangyu area in China, following the guidelines of the International Association of Geodesy Joint Working Group 2.2.2, known as “The 1 cm geoid
Dongmei Guo   +6 more
semanticscholar   +1 more source

Using satellite altimetry leveling to assess the marine geoid

open access: yesGeodesy and Geodynamics, 2020
Based on the concept of Global Position System (GPS)/leveling, the satellite altimetry leveling (SAL) is first proposed to evaluate the marine geoid. SAL is derived by the difference among the mean sea surface (MSS), mean dynamic ocean topography (MDT ...
Zhengtao Wang   +2 more
doaj   +1 more source

利用中国北部连续重力站资料评估全球潮汐模型精度

open access: yesDizhen xuebao, 2021
为评估全球潮汐模型在我国潮汐改正中的适用性,本文首先对10个重力站2016—2018年的观测数据进行了精度评定,而后基于均方根、和方根、纬度依赖关系以及重力残差等指标对7个全球潮汐模型进行了精度评定。结果表明:10个重力站的一些评价指标达到甚至超越了早期超导重力仪,例如M2波潮汐因子的中误差普遍小于0.000 70,其中最高精度约为0.000 14,5个主要潮波的稳定度均≤0.001 5。在10个观测模型和7个全球潮汐模型中,DDW-NHi和M2001模型考虑了地球扁率的影响 ...
Jin Wei   +4 more
doaj   +1 more source

Assessing Molodensky’s Heights: A Rebuttal

open access: yes, 2022
Abstract This paper is written as a progression of the ongoing discussion in geodesy about the merits of the Molodensky height system versus the classical height system. It is a rebuttal of a publication in the Proceedings of the IX Hotine-Marussi Symposium on Mathematical Geodesy by Victor Popadyev titled “On the Advantage of Normal Heights:
R. Kingdon   +4 more
openaire   +1 more source

Can We Improve the Preprocessing of Photospheric Vector Magnetograms by the Inclusion of Chromospheric Observations? [PDF]

open access: yes, 2008
The solar magnetic field is key to understanding the physical processes in the solar atmosphere. Nonlinear force-free codes have been shown to be useful in extrapolating the coronal field upward from underlying vector boundary data.
A.A. Ballegooijen van   +32 more
core   +2 more sources

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