Data / Products
Earth Orientation Data
IERS provides rapid, monthly and long term earth orientation data as well as leap second announcements and announcements of DUT1 in the form of bulletins or data files.
IERS Conventions
The IERS Conventions define the standard reference system to be used by the IERS. They contain conventional models, constants and standards.
ICRF / ICRS
The International Celestial Reference Frame (ICRF) consists of equatorial coordinates of extragalactic radio sources observed with VLBI, realizing an ideal reference system, the International Celestial Reference System (ICRS).
ITRF / ITRS
The International Terrestrial Reference Frame (ITRF) is a set of points with their 3-dimensional cartesian coordinates which realize an ideal reference system, the International Terrestrial Reference System (ITRS).
Geophysical Fluids Data
Global geophysical fluids data provide information related to Earth rotation variation, gravity field variation and geocenter motion that are caused by mass transports in the global geophysical fluids (atmosphere, oceans, hydrology, tides, mantle, core).
The IERS issues also Annual Reports, Technical Notes and other publications. The content of the product descriptions are based on the results of a survey on the IERS products performed by the IERS Analysis Coordinator.