[sheltgor]

I haven't actually poured through the data set linked in the article, but skimming it gives the impression that it includes a variety of images from 1964-70, which seems to me like a lot more than just a snapshot. It even mentions in the article that they were able to see multiple years of polar ice.

[soperj]

That would still be a snapshot. There is no monthly data, or even yearly on the same date by the sounds of things, nor does it backfill up to 1979(when we started actually collecting data)