Results 31 to 40 of about 29,699 (219)

Comparative analysis among Asia–Pacific geoid models stored at the ISG repository

Terrestrial, Atmospheric and Oceanic Sciences, 2022
Geoid models have important applications in geosciences as well as engineering, for example, for the conversion from ellipsoidal heights observed by GNSS techniques to orthometric heights.
Carlo Iapige De Gaetani, Khulan Batsukh, Lorenzo Rossi, Mirko Reguzzoni   +3 more
doaj   +1 more source

Methodology for optimizing heights in the Amsterdam system based on regional and global geoid/quasi-geoid models

Geodesy and Geodynamics
The article presents a methodology for transitioning to the Amsterdam height system based on utilizing global and regional geoid/quasi-geoid models. The study was conducted for the Polish-Ukrainian cross-border sector and expanded to the entire territory
Alina Fedorchuk, Bohdan Dzhuman, Mykhailo Forostyna   +2 more
doaj   +1 more source

Determination of Istanbul geoid using GNSS/levelling and valley cross levelling data

, 2020
The Istanbul GPS Triangulation Network (IGTN) and the Istanbul Levelling Network (ILN), established in 2006, provide data for the determination of a local GNSS/levelling geoid model. These networks' measurements were done separately on both the Asian and
M. Albayrak, M. Özlüdemir, M. M. Aref, Kerem Halicioglu   +3 more
semanticscholar   +1 more source

Adjustment of the Local Gravimetric Network by Several Software Packages Using the Kazan Calibration Line as an Example

Russian Journal of Earth Sciences
Processing and adjustment of gravity measurements represent an essential scientific and practical challenge in geophysics and geodesy, necessitating efficient and reliable software solutions.
Kemerbayev Nurgan, Zhumakanov Ayan, Shkiyeva Maral, Kharisov Ayrat, Islyamova Anel', Sermiagin Roman, Zhanakulova Katima, Kalen Eraly   +7 more
doaj   +1 more source

Relativistic geoid: Gravity potential and relativistic effects [PDF]

Physical Review D, 2019
The Earth's geoid is one of the most essential and fundamental concepts to provide a gravity field-related height reference in geodesy and associated sciences.
Dennis Philipp, E. Hackmann, C. Lämmerzahl, Jürgen Müller   +3 more
semanticscholar   +1 more source

Referencing regional geoid-based vertical datums to national tide gauge networks

Journal of Geodetic Science, 2012
The objective of this study is to investigate the best means for referencing a regional geoid-based vertical datum to a network of tide gauges. In this study, a network of 27 tide gauge stations scattered along the coasts of Canada are used in order to ...
Bolkas D., Fotopoulos G., Sideris M. G.
doaj   +1 more source

Error calibration of quasi-geoidal, normal and ellipsoidal heights of Sweden using variance component estimation

Contributions to Geophysics and Geodesy, 2010
Errors of estimated parameters in an adjustment process should be scaled according to the size of the estimated residuals or misclosures. After computing a quasigeoid (geoid), its biases and tilts, due to existence of systematic errors in the ...
Mehdi ESHAGH
doaj   +1 more source

How the Indian Ocean Geoid Low Was Formed

Geophysical Research Letters, 2023
The origin of the Earth's lowest geoid, the Indian Ocean geoid low (IOGL) has been controversial. The geoid predicted from present‐day tomography models has shown that mid to upper mantle hot anomalies are integral in generating the IOGL.
Debanjan Pal, Attreyee Ghosh
doaj   +1 more source

GPS-derived geoid using artificial neural network and least squares collocation [PDF]

, 2006
The geoidal undulations are needed for determining the orthometric heights from the Global Positioning System GPS-derived ellipsoidal heights. There ore several methods for geoidal undulation determination.
Ambrožič, Tomaž, Kuhar, Miran, Stopar, Bojan, Turk, Goran   +3 more
core   +1 more source

The Layout and Size of an Early Pre‐Pottery Neolithic B Small Settlement Revealed by Geophysical Prospection at Harbetsuvan Tepesi in Southeastern Anatolia

Archaeological Prospection, EarlyView.
ABSTRACT In Upper Mesopotamia, the transition from the Pre‐Pottery Neolithic A (PPNA) to Pre‐Pottery Neolithic B (PPNB) period, ca. 10 800–10 600 cal. BP, is marked by a series of changes in chipped stone industries, architectural forms, symbolic objects, regional distribution of settlements and long‐distance exchange networks among others.
Toshihiro Tada, Ryota Moriwaki, Kazuya Shimogama, Kenta Suzuki, Wataru Satake, Nurcan Küçükarslan, Celal Uludağ, Yoshihiro Nishiaki   +7 more
wiley   +1 more source