1. GLI 250m ocean color product
GLI 250m channels
Algorithms
Sample images
GLI Ocean group
H. Murakami (JAXA/EORC)

2. GLI 250m channels GLI 250m bands are designed for the land monitoring.
We processed 250m CH20, 21 and 23 instead of 1-km CH06, 09 and 18 by linear regressions (we will prepare actual 250m look-up tables soon). ch
Wave length [nm]
Dynamic range
[W/m2/str/m]
SNR
(input L) 20
462.4
691
241 (36) 21
542.1
585
141 (25) 22
661.3
115 (156)
255 (14) 23
824.1
210 (287)
218 (21) 28
1644.9 76
298 (5) 29
2193.8 32
160 (1.3)

3. Algorithms Atmospheric correction:
Basically same algorithm is used in the 250-m processing except for,
iteration is not applied
Aerosol model number (not tau_a) is spatially averaged to reduce sensor noise.
In-water algorithm:
We use P-6 by B. G. Mitchell because only two bands are available from blue to green.

4. Sample images
Images of nLw are very fine, because noise from atmospheric correction is minimized by the aerosol spatial averaging.

5. Sample images
CHLA image looks somewhat noisy, because SNR levels of visible bands are lower than 1-km ocean color bands and band-ratio enlarge the noise.