Title pretty much says it all. See:
https://tidesandcurrents.noaa.gov/datum-updates/igld/
for details.
GIA impacts an important factor.
The site doesn??t have much additional content except this: https://tidesandcurrents.noaa.gov/datum-updates/assets/pdf/igld_2020_factsheet.pdf ?ÿ
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There are 2 ppt on the NGS website from 2021:?ÿ
They probably have similar slides. I didn't look at the 2nd one.
https://geodesy.noaa.gov/web/science_edu/presentations_library/files/Lakebed2030_IGLD_Jun2021.pptx
https://geodesy.noaa.gov/web/science_edu/webinar_series/july2021-igld.pptx
All of the GNSS observations for IGLD2020 are complete (At least on the US side as of Saturday).
That was a certainly a big GPS campaign. For my part, I ended up driving about 6400 miles, stayed at 15 hotels and doing 42 of the 370+ observations. But the survey went extremely well and stayed right on schedule right to the end. No one had any gear tampered with or stolen and the weather cooperated throughout the entire campaign. We had a good plan, and dedicated observers. I am very pleased.