Optical water types (OWTs) can represent diverse ranges of Chlorophyll-a (Chl-a), total suspended matter (TSM), and colored dissolved organic matter (CDOM) concentrations, which make them extremely useful for monitoring water quality, for example, detecting eutrophic conditions or tuning remote sensing algorithms. In this study, the objective is to assess OWTs found in Brazilian waters using in situ remote sensing reflectance (R_rs), acquired for water bodies encompassing a wide range of optical characteristics. Eight OWTs are obtained based on R_rs spectral shape and magnitude, which represent different limnological characteristics of Brazilian waters. The OWT 1 is clear waters with low TSM, Chl-a, and CDOM (median (\(\tilde{x}\)): TSM of 2.64 g m⁻³, Chl-a of 6.04 mg m⁻³, and CDOM of 0.6 m⁻¹); OWT 2 represents moderate turbid waters (TSM \(\tilde{x}\): 5.14); OWTs 3, 4, and 5 are characterized by waters with high Chl-a concentration (\(\tilde{x}\): 33.1, 39.6, and 180.4 mg m⁻³, respectively); OWT 6 is characterized with the highest CDOM concentration (\(\tilde{x}\): 4.07 m⁻¹); OWTs 7 and 8 consist of waters with the highest TSM concentrations from terrestrial input (\(\tilde{x}\): 19.55 and 93.25, respectively). Hence, those OWTs could support satellite monitoring by helping to tune algorithms and also providing wide spatial–temporal monitoring.

光学水类型（OWT）可以代表不同范围的叶绿素a（Chl-a），总悬浮物（TSM）和有色溶解有机物（CDOM）浓度，这使得它们对于监测水质非常有用，例如，检测富营养状况或调整遥感算法。在这项研究中，目标是使用就地遥感反射率（R _rs）评估巴西水域中发现的OWT，该反射率是针对具有广泛光学特性的水体而获得的。根据R _rs的光谱形状和大小获得了8个OWT ，这代表了巴西水域的不同湖泊学特征。OWT 1是具有低TSM，Chl-a和CDOM（中位数（\（\ tilde {x} \））：TSM为2.64 g m ^-3，Chl-a为6.04 mg m ^-3，CDOM为0.6 m ^-1）；OWT 2代表中度浑浊水域（TSM \（\ tilde {x} \）：5.14）；OWTS 3，图4，和图5的特征在于具有高叶绿素a浓度水域（\（\代字号{X} \）：33.1，39.6，180.4和毫克米^-3分别）; OWT 6的特征在于具有最高的CDOM浓度（\（\ tilde {x} \）：4.07 m ^-1）；OWTs 7和8由来自地面输入（\（\ tilde {x} \）的TSM浓度最高的水组成：分别为19.55和93.25）。因此，那些OWT可以通过帮助调整算法并提供广泛的时空监视来支持卫星监视。