I received a response. My inquiry specifically gave lat and long for the 'hilly strip of structures' just outside of the blurred series of dark spots. I mentioned the possibility of lava flow, and mentioned that this part of the map is presumably public.
{
"We are pleased that you have been interested and exploring the REMA data. The REMA data extends to a maximum of about 88 degrees south. This is due to the polar orbiting satellites trajectory where a couple degree gap at both poles cannot be reached, leaving what is known as the 'pole hole'. These data holes will have to be filled with aerial or ground surveys in the future. If you are needing elevation values for the areas you mentioned as blurred please take a look at the lower resolution (200m) RAMP data. The features you found near the pole hole (dark circular artifacts) are interpolation errors due to the lack of sufficient data in the area. No data has been blurred in REMA and all of the released imagery-derived products (mosaics and strips) are free and open to the public. There may be smoothing-effects caused by filtering or bad data due to cloud coverage, etc. so it is important to utilize the strip DEMs when an area is in question.
I hope this has answered your questions and you continue to make interesting finds in your exploration of the data."
}
I am not in a position of knowledge to warrant skepticism about the claim in the response. Any lavafags, geologyfags, cartographyfags, or volcanofags; be my guest.
cheers