Results 41 to 50 of about 215,132 (193)

Comparison of Site Velocities Derived from Collocated GPS, VLBI and SLR Techniques at The Hartebeesthoek Radio Astronomy Observatory (Comparison of Site Velocities)

Journal of Geodetic Science, 2014
Space geodetic techniques provide highly accurate methods for estimating bedrock stability at subcentimetre level. We utilize data derived from Satellite Laser Ranging (SLR), Very Long Baseline Interferometry (VLBI) and Global Positioning Systems (GPS ...
Munghemezulu C., Combrinck L., Mayer D., Botai O.J.   +3 more
doaj   +1 more source

The correspondence of Giovanni Santini and Giuseppe Lorenzoni, directors of the Astronomical Observatory of Padua in the 19th century

Annals of Geophysics, 2009
<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;">Giovanni Santini was appointed director of the Astronomical Observatory of Padova from 1817 to 1877. His scientific correspondence covers a period from 1807 to 1874. Most of the letters
Luisa Pigatto
doaj   +1 more source

THE ROLE OF ASTRO-GEODETIC IN PRECISE GUIDANCE OF LONG TUNNELS [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2015
One of prime aspects of surveying projects is guidance of paths of a long tunnel from different directions and finally ending all paths in a specific place. This kind of underground surveying, because of particular condition, has some different points in
M. Mirghasempour, A. Y. Jafari
doaj   +1 more source

Imaging the Alpine Collision With Seismic Radial Anisotropy

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 9, September 2026.
Abstract The Alpine region and the adjacent Northern Apennines (NA) and Northern Dinarides record the complex tectonic evolution associated with the collision between the Eurasian and Adriatic plates. We combine Rayleigh and Love surface waves from ambient noise and earthquake data recorded at over 3,300 seismic stations to construct a high‐resolution ...
Henrique Berger Roisenberg, Felix Eckel, Amr El‐Sharkawy, Claudio Rosenberg, Lapo Boschi, Thomas Meier, Fabio Cammarano   +6 more
wiley   +1 more source

Integrated Precipitable Water from GPS Observations and CIMEL Sunphotometer Measurements at CGO Belsk

Reports on Geodesy and Geoinformatics, 2017
This paper describes results of integrated precipitable water co-located measurements from two techniques: GPS solution and CIMEL-318 sunphotometer. Integrated Precipitable Water (IPW) is an important meteorological parameter and is derived from GPS ...
Kruczyk Michał, Liwosz Tomasz, Pietruczuk Aleksander   +2 more
doaj   +1 more source

The Impacts of Tropospheric Gravity Wave‐Generated MSTIDs on Skywaves at Mid‐latitude North American Sector Observed and Modeled Using SuperDARN HF Radars

Radio Science, Volume 61, Issue 9, September 2026.
Abstract Trans‐ionospheric high frequency (HF: 3–30 MHz) response to atmospheric gravity waves (GWs) is studied in the middle‐latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW‐generated medium‐scale traveling ionospheric disturbances (MSTID ...
S. Chakraborty, P. A. Inchin, S. Debchoudhury, B. Bergsson, M. Zettergren, J. M. Ruohoniemi   +5 more
wiley   +1 more source

A New Geodetic Research Data Management System At The Hartebeesthoek Radio Astronomy Observatory

, 2014
The Hartebeesthoek Radio Astronomy Observatory (HartRAO) hosts two research programmes: radio astronomy and space geodesy. The Space Geodesy programme has four main co-located space geodetic techniques, making HartRAO a true fiducial site. These techniques are Global Navigation Satellite Systems (GNSS), Satellite Laser Ranging (SLR), geodetic Very Long
Coetzer, Glenda L., Botha, Roelf C., Combrinck, W. Ludwig, Fourie, Stoffel C.J.S.   +3 more
openaire   +2 more sources

Obtaining Local‐Tie Vectors From Short‐Baseline Interferometry Between Legacy S/X and VGOS Telescopes at Ny‐Ålesund

Radio Science, Volume 61, Issue 9, September 2026.
Abstract With the ongoing transition for geodetic Very Long Baseline Interferometry (VLBI) from the use of legacy S/X telescopes to the VLBI Global Observing System (VGOS), it is necessary to connect the new VGOS network to the existing legacy S/X telescopes.
Rebekka Handirk, Eskil Varenius, Tobias Nilsson, Karine Le Bail, Rubén Bolaño González, Susana Garcia‐Espada, Axel Meldahl, Thomas Gasmoe, Silje Agnes Grøslie Wennesland, Oddvar Bråvold Tangen, Halfdan Pascal Kierulf   +10 more
wiley   +1 more source

Satellite laser ranging measurements in South Africa: Contributions to earth system sciences

South African Journal of Science, 2015
This contribution reassesses progress in the development of satellite laser ranging (SLR) technology and its scientific and societal applications in South Africa.
Christina M. Botai, Ludwig Combrinck, Joel O. Botai   +2 more
doaj   +1 more source

Characterizing Incoming Cocos Plate Structure Outboard of the Guerrero Gap and Adjacent Segments Offshore Mexico: Implications for Along‐Strike Variations in Megathrust Slip Behavior

Geochemistry, Geophysics, Geosystems, Volume 27, Issue 9, September 2026.
Abstract Megathrust slip behavior in subduction zones can vary along‐strike, yet the mechanisms driving this variability remain uncertain. The Middle America trench offshore Mexico provides an ideal setting to investigate the structural controls on megathrust slip behavior.
Davis Hagemeier, Anne Bécel, Tanner Acquisto, Víctor M. Cruz‐Atienza, Brandon Shuck, Donna J. Shillington, Shuoshuo Han, Brian Boston, Jorge A. Real, Yoshihiro Ito, Grace Ward   +10 more
wiley   +1 more source