As Glaciers Recede Worldwide, One Defies Trend
"Many of the world’s glaciers are losing mass and receding, such as those in Chile’s Southern Patagonia Icefield (SPI). However, one of SPI’s glaciers, the Brüggen Glacier (also known as the Pio XI Glacier), is advancing for no clear reason. Between 1998 and 2014, the glacier’s southern front advanced 593 meters (about 1,945 feet), and its northern front, which flows into Lake Greve, advanced 107 meters (about 351 feet). Scientists theorize that activity inside or beneath the glacier could be making it advance, along with factors like flow speed and the lake’s depth. Whatever the cause, the SPI glaciers continue to be closely monitored from space."
yep....noticed that too.
Um, no I didn't notice that at all. One effort shows data from 2004, mainly due to 2004 being such a major year for the Muir Glacier. The rest are pretty recent. 20% are from 2020. 75% from the last 5 years.
Unless you meant that any remote sensing data is from the past, even if taken seconds ago.
Satellite data usually takes a little while to be made public due to processing requirements (e.g. ICESat-2 was launched in 2018, but some higher level products haven't been produced yet.) Then researchers need time to figure out what the data is actually showing.
Also, regarding the images being a few years old, that’s obviously for security reasons. Satellite images made available to the public are never current for obvious reasons.