## Appendix A
\begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline
**Instrument** & **Classification** & **Wavelength** & **Average** & **Spatial** & **Sweath** & **Width** & **Mass** & **Power** & **Data** & **Artitude** \\
**(Mission)** & & **[um]** & **Size** & **[m]** & **[km]** & **[km]** & **[km]** & **[kg]** & **[W]** & **[Mbps]** & **[km]** \\ \hline MetImage \({}^{\dagger}\) & Radiometer/ & [0.443-13.345] & & 0.17 & 0.25 to 0.5 or 1 & 267 & 296 & 465 & 18 & 817 \\ (MetOp-SG) [25] & Multispectral resolution & 20 spectral channels & & & & & & & & \\ \hline VIRS & Radiometer/ & [0.4-12.5] & & 0.184 & 0.375 to 0.75 & 3000 & **275** & **240** & 5.9 & 825 \\ (NOAA-20) [25] & Multispectral resolution & 22 spectral channels & & & & & & & \\ \hline Mods \({}^{\ddagger}\) & Radiometer/ & [0.4-14] 36 & & 0.178 & 0.25–1 & 2330 & 229 & **1625** & 6.1 & 705 \\ (Terra/Aqua) [25] & Multispectral resolution & spectral channels & & & & & & & \\ \hline SIST \({}^{\ddagger}\) & Radiometer/ & [0.545-12.5] & & & & & & & & \\ (Sentinel-3) [24,25] & Multispectral resolution & 11 spectral channels & - & 0.5–1.0 & 1400 & **140** & **100** & 64 & 814.5 \\ \hline OLC1 & Radiometer/ & [0.55-10.85] & & & & & & & & \\ (Sentinel-3) [25] & Multispectral resolution & 21 spectral channels & - & 0.3 & 1270 & **150** & **124** & 5 & 814.5 \\ \hline AATSR \({}^{\ddagger}\) & Radiometer/ & [0.4–15] & & & & & & & \\ (Envisu) [25] & Multispectral resolution & 7 spectral channels & & & & & & & \\ \hline VIRS \({}^{\ddagger}\) & Radiometer/ & & & & & & & & \\ (TRMM) [25] & Multispectral resolution & & & & & & & & \\ \hline AVHRR / 3\({}^{\ddagger}\) & Radiometer/ & & [0.58-12.5] & & & & & & & \\ (Metop) NOAA & Multispectral resolution & 6 spectral channels & & & & & & & \\ (25,61) & & & & & & & & & \\ \hline Naomi \({}^{\ddagger}\) & Radiometer/ & [0.45-0.89] & & & & & & & & \\ (SPOT-6-7) [25] & Multispectral resolution & 5 spectral channels & & & & & & & \\ \hline CRIRS \({}^{\ddagger}\) & Imager Spectrometer/ & [0.4-1.05] & & & & & & & & \\ (PROBA-1) & Hyperspectral resolution & 63 spectral channels & & & & & & & \\ (25) & & & & & & & & & \\ \hline COMS \({}^{\ddagger}\) & Imager Radiometer/ & [0.4-1.05] & & & & & & & & \\ (STSat-3) [25] & Hyperspectral resolution & 64 spectral channels & & & & & & & \\ \hline HyperScout/ & & & & & & & & & \\ (FSSCAT, 5/B) [49] & Hyperspectral resolution & 45 spectral bands & & & & & & & \\ \hline CIRC \({}^{\ddagger}\) & Infrared radiometer & & [8–12] & & 0.08 & 200 & 128 & 3 & \(<\)20 & - & 640 \\ (ALCO-3) [25] & Single TIR channel & & & & & & & & \\ \hline \hline \end{tabular}  
* The background color in the table indicates the type of platforms suitable for the instrument according to the power and mass requirements: Very light gray: Nano-platform; Light gray: Micro-platform; gray: mini-platform; \({}^{\star}\) Instrument affordable for a wide range of geophysical variables, from cloud classification and properties, to aerosol main properties, land surface variables and sea surface variables. \({}^{\ddagger}\) Instrument affordable for cloud analysis, aerosol inference, land surface variables and sea surface variables. \({}^{\ddagger}\) Instrument affordable for Observation of land surface (e.g., vegetation), marine biology (e.g., ocean color), and cloud/ aerosol.  
\end{table} 
Table 8: Survey of optical radiometer instruments: multispectral and hyperspectral.