Is the sea rising...or is the land sinking?

Well..true enough..as far as it goes. Of course, sublimation involves some dissolution of the land into the water--thus not disappearing, of course, but settling many feet below the surface.
Sublimation? I think you might have meant subsidence. And I haven't the faintest idea what you meant by "some dissolution of the land into the water".
 
... or satellite altimeters ...

Do you mean volume and density? ... because force is proportional to mass ... and mean sea level is defined in terms of the force of gravity ... it is the shell of equal gravitational potential ... and fluid mechanics demands water seek her own level ... on average ... which is what "mean" means in this context ...
If you want to make people on this site think you're smart, you really ought to check what you post before you hit that button. This is complete NONSENSE.

Mean sea level (MSL, often shortened to sea level) is an average surface level of one or more among Earth's coastal bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical datum – a standardised geodetic datum – that is used, for example, as a chart datum in cartography and marine navigation, or, in aviation, as the standard sea level at which atmospheric pressure is measured to calibrate altitude and, consequently, aircraft flight levels. A common and relatively straightforward mean sea-level standard is instead the midpoint between a mean low and mean high tide at a particular location.[1]
Sea levels can be affected by many factors and are known to have varied greatly over geological time scales. Current sea level rise is mainly caused by human-induced climate change.[2] When temperatures rise, mountain glaciers and the polar ice caps melt, increasing the amount of water in water bodies. Because most of human settlement and infrastructure was built in response to a more normalized sea level with limited expected change, populations affected by climate change in connection to sea level rise will need to invest in climate adaptation to mitigate the worst effects or when populations are in extreme risk, a process of managed retreat.
The term above sea level generally refers to above mean sea level (AMSL). The term APSL means above present sea level, comparing sea levels in the past with the level today.
Earth's radius at sea level is 6,378.137 km (3,963.191 mi) at the equator. It is 6,356.752 km (3,949.903 mi) at the poles and 6,371.001 km (3,958.756 mi) on average.[3]
Note that the word gravity does not appear in this text.
I'd like to see your data from this "CU lab" ... I doubt credit unions have must to do with this ... or why a CU would have a lab ... but regardless, we don't know if satellite altimetry works or not (it's not like we have barometers in orbit), so it's always nice to have a second dataset for comparison ...
Do you drink before you write this stuff? CU is Colorado University where one may find welcome | Sea Level Research Group the most highly regarded source of global sea level data on the planet.
 

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