Wikipedia:Reference desk/Archives/Science/2019 August 31

= August 31 =

Sandwich loop
What is the meaning of "sandwich loop" in the context of looping animated satellite imagery of storms, as in this tweet from "NOAA Satellites":
 * Severe #HurricaneDorian, seen in this "sandwich loop" from NOAA's #GOESEast, is heading for the northwestern #Bahamas where the Cat. 4 storm is expected to bring life-threatening storm surge and devastating winds. Latest updates from the @NHC_Atlantic: http://nhc.noaa.gov/

"Loop" is clear, and most references I've found mention a "combination of visible and infrared satellite imagery", but why "sandwich"? -- 173.72.209.196 (talk) —Preceding undated comment added 20:56, 31 August 2019 (UTC)
 * Oooh! Looking at Sandwich (disambiguation) I found Sandwich printing.  So I assume that "sandwich" is just their term for combining the two sets of imagery.  I still can't find it formally defined anywhere.  Can you suggest what Wikipedia article it might be added to and an appropriate source for it, or can we just make the assumption that it is a "looping combination of visible and infrared satellite imagery"?  Does anyone other than NOAA use this term? -- 173.72.209.196 (talk) 21:03, 31 August 2019 (UTC)  PS: Funny that the first sentence of Sandwich printing says it is a "non-digital photographic technique", but that article is tagged at the bottom as being about "Digital photography". ????
 * Most techniques originally done in analog i.e. film photography can now be, and are more likely to be, simulated by digital processing. DroneB (talk) 01:00, 1 September 2019 (UTC)