Results 161 to 170 of about 5,602 (209)

ITRF to GDA94 coordinate transformations

Journal of Applied Geodesy, 2010
The Geocentric Datum of Australia 1994 (GDA94) is a static coordinate datum realised with respect to the International Terrestrial Reference Frame (ITRF) at the reference epoch of 1 January 1994. At this time GDA94 and ITRF were coinci- dent, however, as a consequence of the tectonic mo- tion of the Australian Plate, ongoing refinement of the ITRF and ...
John Dawson
exaly   +2 more sources

IGS contribution to the ITRF

Journal of Geodesy, 2008
We examine the contribution of the International GNSS Service (IGS) to the International Terrestrial Reference Frame (ITRF) by evaluating the quality of the incorporated solutions as well as their major role in the ITRF formation. Starting with the ITRF2005, the ITRF is constructed with input data in the form of time series of station positions (weekly
Z. Altamimi, X. Collilieux
exaly   +2 more sources

Strengthes and Limitations of the ITRF: ITRF2005 and Beyond

International Association of Geodesy Symposia, 2009
As the International Terrestrial Reference Frame (ITRF) is constructed by combination of space geodesy technique solutions together with terrestrial local ties in co-location sites, it then inherits strengths and weaknesses of the combined data. This paper uses the ITRF2005 results in order to illustrate the critical aspects of the combination that ...
Z. Altamimi, X. Collilieux, C. Boucher
exaly   +2 more sources

Realizing ITRF-Consistent Continental-Scale Geodetic Reference Frames

2021
<p>To achieve a regional or continental-scale reference frame that is a densification of the International Terrestrial Reference Frame (ITRF), one can use a set of fiducial GPS / GNSS stations in the ITRF and regional frames.  Predicting coordinates in the realization epoch using the fiducial stations&#8217 ...
Demian Gomez, Michael Bevis, Dana Caccamise   +2 more
openaire   +1 more source

DORIS Assessment of the 2020 ITRF Realizations

2022
<p>In the context of the 2020 realization of the International Terrestrial Reference Frame, the three IERS Production Centers (DGFI, IGN and JPL) delivered three independent solutions from the contributions of the four space geodetic techniques (DORIS, GNSS, SLR and VLBI).
openaire   +1 more source

The GPS Toolbox ITRF Transformations

GPS Solutions, 2002
The GPS Toolbox is dedicated to highlighting algorithms and source code utilized by GPS engineers and scientists. If you have an interesting subroutine or program you would like to share with our readers, please pass it along so that we might continue to bring you this column; e-mail it to us at gps-toolbox@ngs.noaa.gov. To comment on any of the source
openaire   +1 more source

Accuracy Assessment of the ITRF Datum Definition

2008
One of the main objectives of the International Terrestrial Reference Frame (ITRF) is to provide a standard global reference frame having the most attainable accuracy of its datum definition in terms of its origin, scale and the time evolution of its orientation. This latter should satisfy, by convention, the no net rotation condition.
Z. Altamimi, X. Collilieux, C. Boucher
openaire   +1 more source

ITRF Combination — Status and Recommendations for the Future

2005
In its function as ITRS Combination Center and IERS Combination Research Center, DGFI is involved in the combination of space geodetic observations. Based on the latest space geodetic solutions provided by individual analysis centers and/or technique centers, DGFI has computed a combined solution for station positions and velocities.
D. Angermann, H. Drewes, M. Gerstl, R. Kelm, M. Krügel, B. Meisel   +5 more
openaire   +1 more source

Expanded SLR Target Constellation for Improved Future ITRFs

2020
The GGOS-imposed requirements to be met by all geodetic techniques per decade are very stringent: 1 mm position and 0.1 mm/y temporal stability. We are an order of magnitude worse today due to a poor ground segment and limitations in the space segment.
Pavlis, E. C., Kuzmicz-Cieslak, M., Evans, K.   +2 more
openaire   +1 more source

The Choice of Reference System in ITRF Formulation

2011
The problem of choosing an optimal reference system for the International Terrestrial Reference Frame (ITRF) is studied for both the rigorous solution which is a simultaneous stacking (removal of the reference system at each data epoch and implementation of a linear in time coordinate model) for all techniques, as well as for the usual numerically ...
Zuheir Altamimi, Athanasios Dermanis
openaire   +1 more source