The ability to predict an occurrence of cholera, a water-related disease, offers a significant public health advantage. Satellite-based estimates of chlorophyll, a surrogate for plankton abundance, have been linked to cholera incidence. However, cholera bacteria can survive under a variety of coastal ecological conditions, thus constraining the predictive ability of the chlorophyll, since it provides only an estimate of greenness of seawater. Here, a new remote-sensing-based index is proposed: Satellite Water Marker (SWM), which estimates the condition of coastal water, based on observed variability in the difference between blue (412 nm) and green (555 nm) wavelengths that can be related to seasonal cholera incidence. The index is bounded between physically separable wavelengths for relatively clear (blue) and turbid (green) water. Using SWM, prediction of cholera with reasonable accuracy, at least two months in advance, can potentially be achieved in the endemic coastal regions.

预测霍乱（一种与水有关的疾病）发生的能力提供了显着的公共卫生优势。基于卫星的叶绿素估计值是浮游生物丰度的替代指标，与霍乱发病率有关。然而，霍乱细菌可以在各种沿海生态条件下存活，从而限制了叶绿素的预测能力，因为它仅提供了对海水绿度的估计。在这里，提出了一种新的基于遥感的指数：卫星水标 (SWM)，它根据观察到的蓝色 (412 nm) 和绿色 (555 nm) 波长之间差异的差异来估计沿海水域的状况与季节性霍乱发病有关。该指数在相对清澈（蓝色）和浑浊（绿色）水的物理可分离波长之间有界。使用 SWM，