Comparison of RRS between HydroLight and OSOAA

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I made a comparison between the results from OSOAA and HydroLight and found that there was a big gap between them.

• The spectral shapes of the two are similar, but the order of magnitude is quite different.
• When the concentration difference is large, the simulation results of OSOAA are relatively concentrated. This shows that the sensitivity of remote sensing reflectance simulated by OSOAA is not as high as that of HydroLight.
• The simulated value of HydroLight is closer to the measured value.

Here are some detailed comparisons:

1. Remote sensing reflectance curves of different chlorophyll concentrations

2. The absorption coefficient of yellow matter = 0.3m-1, the concentration of inorganic suspended particles = 30mg / L, and the effect of chlorophyll concentration on water spectrum

3. Remote sensing reflectance curve of inorganic suspended sediment with different concentrations

4. The concentration of chlorophyll is 20mg / m3, the absorption coefficient of the yellow matter is 0.3m-1, and the influence of the concentration of inorganic suspended particles on the spectrum of the water body

5. Remote sensing reflectance curves of CDOM with different concentrations

6. The concentration of chlorophyll is 20mg / m3, the concentration of inorganic suspended particles is 20mg / L, and the influence of the absorption coefficient of yellow matter on water spectrum

   The figure above of each example is simulated by HydroLight, and the figure below is simulated by OSOAA.

   I believe in the results of HydroLight more because it is closer to the measured results. What do you think is the problem with OSOAA?