NGSLR Greenbelt, MD


List of analysis centers that contributed to the SLRF2020 productThe SLR-tailored version of ITRF2020, the SLRF2020, has been released to the publicRelease Date: 07/25/2023 The long-awaited SLR-tailored version of ITRF2020, the SLRF2020, has been released to the public, along with the associated Data Handling File required for proper and accurate reduction of SLR data. Both files contain notes that are important to users, especially to those requiring the highest quality results in their work; it is imperative that users read these notes before implementing the new TRF in their production lines.

The two files can be accessed from the ILRS website pages:


CDDIS Landing pages with the appropriate DOIs are here:


Flyer for LLR WorkshopFirst Lunar Laser Ranging (LLR) Meeting, September 14th and 15th, 2023, Pole Astronomie Géoazur, Observatoire de la Côte d'Azur (OCA), CNRS - INSU, Université Côte d'Azur (UCA), France Release Date: 05/10/2023 The first LLR meeting wishes to bring both the producers, the users and the science behind lunar laser ranging together in order to join efforts and resources, to define goals and enhance the visibility for a LLR community, and to identify synergies and to plan for the future. The goal is to encourage every group to help and form a visible global community.

Clément Courde

Julien Chabé

image of sea mounts on the ocean floor.SLR & DORIS Support the Discovery of 19,000 Undersea Volcanos Using Satellite AltimetryRelease Date: 04/21/2023

A team of scientists has published a new catalog of undersea volcanos, or seamounts, that are derived using ocean radar altimetry data from the satellites Jason-1, Envisat CryoSat-2, and Saral/AltiKa. The altimeter data for this study were obtained primarily from the geodetic missions for these satellites. In the geodetic missions, the satellites flew so that successive ground tracks were aligned close together. This facilitated the mapping of the ocean geoid.The data from these most recent satellite missions have improved the ability to find previously undetected seamounts, from how the mass of the seamounts perturbs the shape of the ocean surface.

The new map will aid studies of marine tectonics, geology, ecology and ocean mixing.

This discovery was supported by Precise Orbit Determination (POD), including Satellite Laser Ranging (SLR), and DORIS for Jason-1, Envisat, CryoSat-2, and Saral/ALtiKa whose altimeter data contributed to the results of this new study.

More information:
Overview article in Science magazine, April 19, 2023:

Scientific publication, published March 20, 2023:
Gevorgian J., Sandwell D., Yu Y., Kim S.-S. and Wessel P. (2023). "Global distribution and morphology of small seamounts". Earth and Space Science, 10, e2022EA002331.

Updated list of Conferences and workshops related to earth rotation, reference frames, geophysical fluids, GNSS, SLR, VLBI, DORIS, etc. posted by the IERS

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