Table 2. Chl Algorithm Performance From SeaWiFS Measurements for Chl ≤ 0.25 mg m-3, as Gauged by in Situ Chla
Algorithm RMS URMS Mean Ratio Median Ratio MRE R2 (Linear) R2 (Log) N
OC4v6 535.8% 54.2% 1.79 1.19 41.5% 0.01 0.33 357
CI 91.8% 47.2% 1.40 1.16 36.8% 0.31 0.39 357
OClow 92.9% 45.6% 1.33 1.08 34.7% 0.20 0.36 357
aSeaWiFS-derived Rrs(lambda) were used as the input of all algorithms. OClow represents a local band-ratio algorithm for low concentrations only (CI < -0.0005 sr-1; Figure 3a, red line). URMS, "unbiased" RMS (see text for details); MRE, mean relative error after converting negative errors to positive.