Read two GLI observations

During its early checkout, Midori-2 returned GLI observations of Kyushu and the East China Sea at about 11:30 JST on January 25, 2003. NASDA’s release identifies a composite using channels 28, 23 and 22 at 1640, 825 and 660 nanometers, with 250-meter ground resolution. Infrared measurements contribute to this display, so its colors are not simply a record of what human eyes would see.

The source identifies low warm clouds as white and higher ice clouds as blue in this particular composite. That interpretation belongs to its spectral recipe and supporting knowledge. It is not a universal rule that every blue satellite pixel is an ice cloud. Begin with the instrument and product description before using display colors as evidence.

The second image shows a winter cyclone east of Hokkaido at about 09:45 JST on the same day. It uses visible channels 13, 8 and 5 at 678, 545 and 460 nanometers, with one-kilometer spatial resolution. The cloud spiral records structure in that scene; the two images cover different regions and use different band combinations.

The cyclone image is earlier, but the pair is not a time-lapse of one cloud field. A caption that said the Kyushu cloud became the Hokkaido cyclone would invent a connection absent from these observations. Movement needs appropriately located repeat observations, while a wind estimate needs its own measurement and retrieval evidence. A compelling spiral image alone does not provide an exact surface wind speed.

In an original scale exercise, a square 250-meter sampling cell covers 0.0625 square kilometers, while a square one-kilometer cell covers one square kilometer. The latter covers sixteen times the area. This arithmetic illustrates how a regional average may combine smaller features; it does not assert that every actual detector footprint is an ideal square.

A broad cloud pattern can be clear even when a small coastal feature is not resolved. Enlarging either image on a monitor does not recover missing independent detail. Retain the full source frame and reference outlines, and choose a question that the observation’s spectral, spatial and temporal information can actually address.