The combined observational power of the multiple earth observing satellites is currently not being harnessed holistically to produce more durable societal benefits. We are not able to take complete advantage of the prolific amount of scientific output and remote sensing data that are emerging rapidly from satellite missions and convert them quickly into decision-making products for users. The current application framework we have appears to be an analog one lacking the absorption bandwidth required to handle scientific research and the voluminous (petabyte-scale) satellite data. This book will tackle this question: "How do we change this course and take full advantage of satellite observational capability for a more sustainable, happier and safer future in the coming decades?"

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 1997,theTropicalRainfallMeasuringMission(TRMM)withthe?rstspace-borne active microwave precipitation radar (TRMM-PR), was launched. The success of TRMMinimprovingourunderstandingonTropicalandSub-tropicalrainfalld- tribution and precipitation structures consequently spurred a larger scale mission aimed at the study of global distribution of precipitation. Today, we now eagerly anticipatetheGlobalPrecipitationMeasurement(GPM)mission,whichenvisions aglobalconstellationofmicrowavesensorsthatwillprovidemoreaccurateglobal rainfallproductsathighresolutionfrom2013onwards. Itisthereforesafetoclaimthreedecadesofresearchheritageonsatelliteremote sensing of rainfall. Similarly, the topic of "surface hydrology" requires no int- duction for readers of environmental sciences and geosciences either. But what happens if we connect all the individual terms and name it - "satellite rainfall applications for surface hydrology"? A new topic is created. But little is known aboutthistopicbecausesatelliteremotesensingofrainfallandsurfacehydrology have evolved rather independently of each other. Even though the potential for a space-bornesourceofrainfalldatawasalwaysrecognizedforavarietyofappli- tions(suchas?oodforecastinginungaugedregions,transboundarywaterresources, global/regionaldroughtandagriculturalplanning),the?eldsofsatelliterainfalland surfacehydrologyhavehardlyintersectedduringtheirdevelopmentalstagesduring thelastfewdecades.Wearenowfacedwithamyriadofquestionsrangingfrom commonoperationalissuestodetailedscienti?cinquiries.Someofthesequestions are: There are so many satellite rainfall products currently available - which one does one use for a speci?c application to get the best results? What is the optimum scaleofapplication ofsatelliterainfalldataforagiven surfaceapplication? Whatis the level of uncertainty in each satellite rainfall product and what is the implication v vi Preface for a given surface hydrologic prediction? Where do I acquire the data for research or for operational applications? How are these satellite rainfall products developed and how do they differ from one another? This book by Springer on "Satellite Rainfall Applications for Surface Hydrology" is a contribution to both scienti?c and practical questions regarding

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 1997,theTropicalRainfallMeasuringMission(TRMM)withthe?rstspace-borne active microwave precipitation radar (TRMM-PR), was launched. The success of TRMMinimprovingourunderstandingonTropicalandSub-tropicalrainfalld- tribution and precipitation structures consequently spurred a larger scale mission aimed at the study of global distribution of precipitation. Today, we now eagerly anticipatetheGlobalPrecipitationMeasurement(GPM)mission,whichenvisions aglobalconstellationofmicrowavesensorsthatwillprovidemoreaccurateglobal rainfallproductsathighresolutionfrom2013onwards. Itisthereforesafetoclaimthreedecadesofresearchheritageonsatelliteremote sensing of rainfall. Similarly, the topic of "surface hydrology" requires no int- duction for readers of environmental sciences and geosciences either. But what happens if we connect all the individual terms and name it - "satellite rainfall applications for surface hydrology"? A new topic is created. But little is known aboutthistopicbecausesatelliteremotesensingofrainfallandsurfacehydrology have evolved rather independently of each other. Even though the potential for a space-bornesourceofrainfalldatawasalwaysrecognizedforavarietyofappli- tions(suchas?oodforecastinginungaugedregions,transboundarywaterresources, global/regionaldroughtandagriculturalplanning),the?eldsofsatelliterainfalland surfacehydrologyhavehardlyintersectedduringtheirdevelopmentalstagesduring thelastfewdecades.Wearenowfacedwithamyriadofquestionsrangingfrom commonoperationalissuestodetailedscienti?cinquiries.Someofthesequestions are: There are so many satellite rainfall products currently available - which one does one use for a speci?c application to get the best results? What is the optimum scaleofapplication ofsatelliterainfalldataforagiven surfaceapplication? Whatis the level of uncertainty in each satellite rainfall product and what is the implication v vi Preface for a given surface hydrologic prediction? Where do I acquire the data for research or for operational applications? How are these satellite rainfall products developed and how do they differ from one another? This book by Springer on "Satellite Rainfall Applications for Surface Hydrology" is a contribution to both scienti?c and practical questions regarding

The combined observational power of the multiple earth observing satellites is currently not being harnessed holistically to produce more durable societal benefits. We are not able to take complete advantage of the prolific amount of scientific output and remote sensing data that are emerging rapidly from satellite missions and convert them quickly into decision-making products for users. The current application framework we have appears to be an analog one lacking the absorption bandwidth required to handle scientific research and the voluminous (petabyte-scale) satellite data. This book will tackle this question: "How do we change this course and take full advantage of satellite observational capability for a more sustainable, happier and safer future in the coming decades?"