International terrestrial reference frame 2020 itrf2020 in january 2019, the iers disseminated a call for participation for a new itrf2020 solution to be released by the itrs center in september or october 2021. International terrestrial reference frame 2005 epsg. International association of geodesy symposia, vol 4. An assessment of the existing continuously operating. Nkg general assembly, goteborg, 14 september, 2014. The itrf2008 is the current realization of the itrs obtained by combination of vlbi, slr. Itrf2008 is a refined version of the international terrestrial reference frame based on reprocessed solutions of the four space geodetic techniques. Igs08 based on the international terrestrial reference frame. Coordinates are based on the grs80 ellipsoid, which was designed to suit the shape of the geoid. The latest version of the international terrestrial reference frame, the itrf2005, has been released by the itrs center in october 2006.
Six years of additional observations will become available at the end of 2020. The trs that is recommended for earth science applications is the international terrestrial reference system itrs. Following this resolution, a detailed description of etrs89 and its relationship with the international terrestrial reference system itrs, including transformation formula were published in boucher and altamimi 1992. International terrestrial reference frame 2014 itrf2014. The itrf is stands for international terrestrial reference frame. The international terrestrial reference frame itrf is a realization of itrs by a set of instantaneous coordinates and velocities of reference points distributed on the topographic surface of the earth. The international terrestrial reference frame itrf itrf2014 and future plans. All current global and regional reference frames rely on the availability of the international terrestrial reference. International terrestrial reference frame itrf according to the recommendations of the iugg and iag of 1991, the international terrestrial reference system itrs realized with the international terrestrial reference frame itrf should be used for any application that requires an accuracy of better than one meter.
This is done in much the same way that a physical standard might be described as a set of procedures for creating a realization of that standard. In december 2001, natural resources canada and the u. The international terrestrial reference frame itrf97 iers. International terrestrial reference frame 2008 origin is origin at geocentre. Noaa technical report nos ngs 62 blueprint for 2022, part 1. Contribution of slr and llr to earth orientation and. For more details regarding the itrs description and definition, the reader may refer to. International terrestrial reference frame 2008 is a geodetic datum for geodesy. Kalref a kalman filter approach to the international. Trs realization by a frame trf reference frame representations for a deformable earth combination of trf solutions stacking of trf time series. The international terrestrial reference system itrs describes procedures for creating reference frames suitable for use with measurements on or near the earths surface. Its initial orientation is aligned closely to previous terrestrial systems for continuity, and its length unit is the systeme. Origin of the international terrestrial reference frame.
As scientists study earths dynamic deformations on seasonal and shorter timescales and. New itrf solutions are produced every few years, using the latest mathematical and surveying techniques to attempt to realize the itrs as precisely as possible. They are intended to be used as regularized coordinates to which some corrections should be added to access instantaneous coordinates. A new release of the international terrestrial reference frame for earth science applications.
International terrestrial reference system and frame wikipedia. The international terrestrial reference system itrs, realized and maintained by the international earth rotation and reference systems service iers has been formally adopted and recommended for earth science applications iugg 2007. It also contains the description and list of all the iers stations. Itrf94, itrf96, itrf97, itrf2000, itrf2005, itrf2008 and itrf2014 solutions are available for download. Itrspc under the name international terrestrial reference frame itrf. International terrestrial reference system and frame. Realization of the iers terrestrial reference system itrs from september 2007. Fig guide fig publication no 64 reference frames in practice manual may 2014. All current global and regional reference frames rely on the availability of the international terrestrial reference frame itrf, which is the most accurate realisation of the international terrestrial reference system itrs.
Kalref a kalman filter approach to the international terrestrial reference frame realization x. The realization of this system is named international terrestrial reference frame itrf and is commonly realized through reference epoch coordinates and linear velocities of a set of points on the earth surface serving as reference points. The international terrestrial reference system itrs describes procedures for creating reference frames suitable for use with measurements on or near the. Update on the international terrestrial reference frame itrf. Its origin is at the center of mass of the whole earth including the oceans and atmosphere.
Minimum constraints are applied to these solutions solely in order to define the underlying terrestrial reference frame trf. The itrf2008 origin is defined in such a way that there are null translation parameters at epoch 2005. The itrs combination centres provide also alternative realizations of the itrf. Pdf origin of international terrestrial reference frame. The international terrestrial reference system itrs iers. North american terrestrial reference frame of 2022. Ibrahim2 1department geography university of portsmouth, portsmouth, uk 2office of the surveyor general of the federation of nigeria, garki ii abuja nigeria. The international terrestrial reference system and etrs89. Concept and definition trs realization by a frame trf international terrestrial reference. The itrs defines a geocentric system of coordinates.
There are two commonly used reference frames in north america. Terrestrial reference frame itrf for science and positioning applications. Global terrestrial reference systems and frames unoosa. Euref tutorial, san sebastian, spain, may 24, 2016 outline concept and definition what is a terrestrial reference system trs, how is it realized. Role and importance of the international terrestrial. An assessment of the existing continuously operating reference stations cors in nigeria. Gps and doris time series of station positions and earth orientation.
The international terrestrial reference system constitutes a set of prescriptions and conventions together with the modelling required to define origin, scale, orientation and time evolution of a conventional terrestrial reference system ctrs. The current conventional realization is the itrf2014. The objective of this web site is to distribute the international terrestrial reference frame itrf products. General concepts international terrestrial reference system. The international earth rotation and reference systems service was created in 1988 to establish and maintain a celestial reference frame, the icrf, a terrestrial reference frame, the itrf.
Its corresponding frames, named international terrestrial reference frames itrfs are supplied and updated regularly by the international earth. Abstract the major goal of this paper is to give an overview about latest developments regarding terrestrial reference frame computations. Measuring earth with gps unit 1 introduction to gps jigsaw. Technical seminar on reference frame in practice rome italy, 4th 5th may 2012 outline what is a terrestrial reference system trs, why is it needed and how is it realized. Gsfc seminar, greenbelt, february 10, 2014 the international terrestrial reference frame. Role and importance of the international terrestrial reference. Following the procedure already used for the itrf2005 and itrf2008 formation, the itrf2014 uses as input data time series of station positions and earth orientation parameters eops provided by the technique centers of the four space geodetic techniques vlbi, slr, gnss and doris. The current origin of the international terrestrial reference frame itrf is defined as the cm, which shows measured seasonal variations of several millimeters to 1 cm with respect to true cm. Concept and definition trs realization by a frame trf international terrestrial reference system itrs and. The international terrestrial reference frame latest. An international terrestrial reference frame itrf is a realization of the itrs. The current origin of the international terrestrial reference frame itrf is defined as the cm, which shows measured seasonal variations of several millimeters.
The reference frame derived from it is the international terrestrial reference frame itrf. The itrs is an ideal reference system, as defined by the iugg resolution no. Global, plateindependent reference frames, such as the international terrestrial reference frame itrf, which embraces time dependency as part of geodetic control. The international terrestrial reference frame itrf. The combined solution c04 for earth orientation parameters. The dataset was originally created by european petroleum survey group epsg in 1985 and was made public in 1993. The international terrestrial reference frame itrf is a set of points with their 3dimensional cartesian coordinates which realize an ideal reference system, the international terrestrial reference system, as defined by the iugg resolution no.
The international terrestrial reference system itrs. Issn 23118423 pdf isbn 9788792853257 pdf published by international federation of surveyors fig. The international terrestrial reference frame itrf iers. An exploration using geographical information system gis ali i. Itrf2014 is the new realization of the international terrestrial reference system. Terrestrial reference system trs for which the trf is a numerical materialization. An international terrestrial reference frame itrf is a realization of the international terrestrial reference system itrs, maintained by the in ternational earth rotation and reference systems service iers. The current origin of the international terrestrial reference frame itrf is defined as the cm, which shows measured seasonal variations of several millimeters to 1. Itrf2014 the international terrestrial reference frame. International terrestrial reference frame itrf is defined as the cm, which shows measured seasonal variations of several millimeters to 1 cm with respect to true cm. The international terrestrial reference frame itrf, as a realization of the international terrestrial reference system itrs, is represented by a set of station positions and linear velocities. The interior region of north america is considered fixed and all else moves compared to it.
International terrestrial reference frame 2005 references the grs 1980 ellipsoid and the greenwich prime meridian. Mike chin1, xavier collilieux2, richard gross1, michael heflin1, ken hurst1, yan jiang1, jay parker1 1jet propulsion laboratory, caltech, usa. Twelve itrf versions were produced, starting with itrf88 and ending with the. International terrestrial reference system itrs and its realization. The earth orientation parameters connect these two frames together. Frank wu1, claudio abbondanza1, zuheir altamimi 2, t. First of all, short definitions on two reference frames should be done. International terrestrial reference frame 2005 origin is origin at geocentre, originally orientated to the bih terrestrial system at epoch 1984.
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