Results 21 to 30 of about 35,939 (297)

GPS supported assessment integrated with GIS service area analysis of healthcare institutions of Basona Werana in comparison with Debre Berhan

Geodesy and Cartography, 2022
The study is principally aimed to assess and analyse the spatial location of the health institutions from lowerlevel Health Posts (HPs) to higher level Referral Hospitals (RHs) in both Zonal Capital Debre Berhan Town (DBT) and the surrounding Rural ...
Wondwossen Mindahun, Natnael Agegnehu, Andnet Nigussie   +2 more
doaj   +1 more source

Application of the Allan Variance to Time Series Analysis in Astrometry and Geodesy: A Review [PDF]

, 2016
The Allan variance (AVAR) was introduced 50 years ago as a statistical tool for assessing of the frequency standards deviations. For the past decades, AVAR has increasingly being used in geodesy and astrometry to assess the noise characteristics in ...
Malkin, Zinovy
core   +2 more sources

Development of Ionospheric Tomography Model Using GPS [PDF]

Journal of Astronomy and Space Sciences, 2006
We produced the electron density distribution in the ionosphere over South Korea using the data from nine permanent GPS (Global Positioning System) stations which have been operated by KASI (Korea Astronomy and Space Science Institute).
Byung-Kyu Choi, Jong-Uk Park, Sang-Jeong Lee   +2 more
doaj   +1 more source

On the eve of the 100th anniversary of IAU Commission 19/A2 “Rotation of the Earth” [PDF]

, 2018
Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG geförderten) Allianz- bzw. Nationallizenz frei zugänglich.This publication is with permission of the rights owner freely accessible due to an Alliance licence and a national licence
Brzeziński, Aleksander, Capitaine, Nicole, Dehant, Véronique, Gross, Richard, Huang, Chengli, Malkin, Zinovy, McCarthy, Dennis, Schuh, Harald, Vondrák, Jan, Yatskiv, Yaroslav   +9 more
core   +1 more source

Improved mapping functions for atmospheric refraction correction in SLR [PDF]

, 2002
[1] We present two new mapping functions (MFs) to model the elevation angle dependence of the atmospheric delay for satellite laser ranging (SLR) data analysis.
Langley, RB, Mendes, VB, Pavlis, DE, Pavlis, EC, Prates, Gonçalo   +4 more
core   +1 more source

Mapping Vertical Land Motion in Challenging Terrain: Six‐Year Trends on Tutuila Island, American Samoa, With PS‐InSAR, GPS, Tide Gauge, and Satellite Altimetry Data

Geophysical Research Letters, 2022
Sea level rise is a major challenge facing coastlines worldwide and can be strongly exacerbated by land subsidence. However, detailed characterization of vertical land motion (VLM) is limited for many tectonically active islands, as many remote sensing ...
Stacey A. Huang, Jeanne M. Sauber, Richard Ray   +2 more
doaj   +1 more source

Recent Advances in Modelling Geodetic Time Series and Applications for Earth Science and Environmental Monitoring

Remote Sensing, 2022
Geodesy is the science of accurately measuring the topography of the earth (geometric shape and size), its orientation in space, and its gravity field.
Xiaoxing He, Jean-Philippe Montillet, Zhao Li, Gaël Kermarrec, Rui Fernandes, Feng Zhou   +5 more
doaj   +1 more source

Optical Clocks in Space [PDF]

, 2006
The performance of optical clocks has strongly progressed in recent years, and accuracies and instabilities of 1 part in 10^18 are expected in the near future.
Ertmer, W., Gill, P., Goerlitz, A., Haensch, T. W., Holzwarth, R., Klein, H. A., Klein, V., Koelemeij, J. C. J., Lemonde, P., Margolis, H. S., Mileti, G., Nevsky, A., Peik, E., Rasel, E., Riehle, F., Salomon, C., Schiller, S., Sterr, U., Tamm, Chr., Tino, G. M., Wicht, A.   +20 more
core   +3 more sources

Cold Atom Interferometry for Enhancing the Radio Science Gravity Experiment: A Phobos Case Study

Remote Sensing, 2022
Interplanetary missions have typically relied on Radio Science (RS) to recover gravity fields by detecting their signatures on the spacecraft trajectory.
Michael Plumaris, Dominic Dirkx, Christian Siemes, Olivier Carraz   +3 more
doaj   +1 more source

Development of a strontium optical lattice clock for the SOC mission on the ISS [PDF]

, 2016
The ESA mission "Space Optical Clock" project aims at operating an optical lattice clock on the ISS in approximately 2023. The scientific goals of the mission are to perform tests of fundamental physics, to enable space-assisted relativistic geodesy and ...
, , A. Kulosa, B. Venon, Ch. Lisdat, D. Holleville, D. Świerad, E.-M. Rasel, G. Barwood, I. R. Hill, J. Hughes, J. Lodewyck, J. Stuhler, K. Bongs, L. Smith, M. S. Pramod, P. Gill, R. Le Targat, S. Bize, S. Origlia, S. Schiller, S. Viswam, S. Vogt, U. Sterr, W. Ertmer, W. He, W. Kaenders, Y. Ovchinnikov, Y. Singh   +28 more
core   +4 more sources