There is a widespread misconception within the spatial science community that the three geocentric datums widely used in Australia, GDA94, ITRF and WGS84 are identical “for all practical purposes”. This is a fair assumption for navigation and many mapping purposes, however users of wide area differential GPS and precise positioning services with a precision of less than a metre are beginning to...

Abstract The aim of this paper is to present the results from GNSS-based densification International Terrestrial Reference Frame (ITRF) in region Cyprus. regional network used for task consists nine permanent GNSS Cypriot stations (eight existing CYPOS plus NICO station which belongs global IGS network) and 34 additional EUREF Permanent Network (EPN) are mostly located continental part Europe. ...

Scientific applications critically depend on the ITRF and impose the most stringent requirements on terrestrial reference frame accuracy and long-term stability. A recent US National Research Council report (Minster et al., Precise geodetic infrastructure: national requirements for a shared resource. The National Academies Press, Washington, DC, 2010) found that the applications demanding the h...

Three topics related to computation of the combined IVS EOP series are discussed. The first one is the consistency of the VLBI EOP series with the IERS reference frames ITRF and ICRF. Not all IVS analysis centers use ITRF/ICRF as reference system for EOP solutions. Some of them realize global solution for simultaneous determination of CRF, TRF and EOP with no-net-rotation constrains w.r.t. ITRF...

Abstract Although modern global geometric reference frames (GRFs) such as the International Terrestrial Reference Frame (ITRF) can be used anywhere on Earth, regional (RRFs) are still to densify geodetic control and optimize solutions for continental-scale areas national purposes. Such RRFs formed by densifying ITRF, utilizing GPS / GNSS stations common both ITRF RRF. It is possible attach a RR...

The IERS with all its different components and products, ranging from the definition and realization of the reference frames (ITRF and ICRF), over EOPs and global geophysical fluid data all the way to conventions, is in a unique position to contribute in an essential way to the integration and combination efforts that are necessary to cope with the next generation of scientific missions and cha...

A “dynamic” geodetic datum is a datum that consists of coordinates and velocities of control points, which can provide users with the realistic positions of sites within the network that reflects the result of local or regional motion induced by a number of causes. A new ITRF-linked scheme is proposed and discussed in order to process available geodetic data in real-time to establish a dynamic ...

The tools and infrastructure are now in place to realize a global, terrestrial, kinematic reference frame with few millimeter precision, which is both spatially dense, and can be reliably updated on a frequent basis (e.g., monthly). A procedure is outlined by which IERS can continuously realize the ITRF using methodology developed by the International GPS Service (IGS). However, spatial densifi...

Dynamic datums, which account for crustal dynamics, are widely used in Australia and New Zealand, although in many cases users may not be aware that they are using such a datum. The most widely-used global dynamic datums in Australia and New Zealand are the International Terrestrial Reference Frame (ITRF) and the World Geodetic System 1984 (WGS84). The use of WGS84 presents particular challenge...