As individual topics, the terms "satellite rainfall" and "surface hydrology" have beenmuchwidelystudiedoverthelastfewdecades.Eversincerainfallproducts beguntobedevelopedusingspace-borneinfraredsensorsingeostationaryorbitin theseventies,satelliteremotesensingofrainfallexperiencedtremendousprogress. Microwavesensorsonlowearthorbitscamealongduringtheeightiestoprovide more accurate estimates of rainfall at the cost of limited sampling. As the c- trastingbutcomplementarypropertiesofmicrowaveandinfraredsensorsbecame apparent,mergedrainfallproductsstartedtoappearduringthefollowingdecade.In...