The meaning of the directory name

directory'name represent by XYY and XYYT: where X represents lakes, YY represents product, and T represetns thumbnail image

eg. 
e, m, h, o, e represent Lake Erie, Lake Michigan, Lake Huron, Lake Ontario respectively.
l, v, r represent Great Lakes (note, loc represents lower part of Great Lakes).
u represent upper of Great Lakes.
a5, a7, aa, c1, c2, c3, c4, c5 represent visible products for different bands.
d1, s7 represents day time and night time SST respectively.
cm represents cloud mask.
s2, s3 old data, not used.
cp, oc represents ocean color between 2002 and 2017, and after 2017 respectively.
ms, vs, os represent true color of MODIS, VIIRS, and Sentinel respectively.
up represent upwelling.
hi, su represents visible product, not used.
ff, fg are old data, not used
ft  represents GOES16 SST.
gi, gv represents GOES visible.
gt, if represent GOES SST (2012-2018), raw and gif respectively.
ic represents SAR ice including SAR wind, etc.
mo, is old data, not used
sz, za are satelllite data, not used

note, cpa not used.