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IERS Message No. 490                                    October 09, 2023
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Changes to IERS EOP xml and csv formats and addition of JSON format


With the implementation of the IERS 2020 C04 system, the parameters
x rate, y rate, sigma x rate, and sigma y rate were also added to this
data series (see IERS Message No. 471).

In the IERS Data Center
(https://datacenter.iers.org/, https://data.iers.org/,
https://www.iers.org/IERS/EN/DataProducts/data.html),
these parameters will also be included in the xml, csv, and HTML files
starting November 6, 2023. This will result in a change to the xml and
csv formats for all EOP products on that date:


The headers of the csv files will be extended for all EOP products by
the mentioned parameters, even if corresponding values are currently
only available for the product "EOP 20 C04 (IAU2000A) - one file
(1962-now)".


For the xml files optional tags for the new parameters are introduced,
so that here only the product "EOP 20 C04 (IAU2000A) - one file
(1962-now)" is directly affected by the change.

If you process csv files of any EOP products or the xml file of the
product "EOP 20 C04 (IAU2000A) - one file (1962-now)", you should check
if your routines still work correctly with the new format and adapt them
if necessary. For this purpose, we have provided sample files in the new
format at the following address:
https://datacenter.iers.org/products/eop/new_format_examples/


Please note: These files are only examples of the new format and will not
be updated.

In addition, we will temporarily provide files in the previous csv
format in separate directories starting November 6, which will be
updated.
You will find them at https://datacenter.iers.org/products/eop
in appropriate subdirectories (e.g.
https://datacenter.iers.org/products/eop/long-term/c04_20/csv-old-
format/).

Starting November 6, data will also be provided in JSON format. You will
find these in corresponding subdirectories of
https://datacenter.iers.org/products/.

If you have any questions, please contact us at
central_bureau@iers.org.


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