**Preface to "Remote Sensing in Hydrology and Water Resources Management"**

In the last few decades, remote sensing (RS) technology has developed rapidly, which provides a means of observing hydrological and hydraulic state variables including precipitation, temperature, soil moisture, water levels, evapotranspiration, flood extent, flow velocity, river discharge, and land water storage over regional/global areas. All these variables could be the input files for integrated hydrodynamics or hydrological or hydrometeorological models to simulate and assess water resources and water-related issues, contributing to fully understand global- and regional-scale hydrological processes under climate change and human activities, which could be useful for improving sustainable water management. The objective of this book is to present reviews and recent advances of general interest that make use of remote sensing techniques in hydrology and water resources management. In general, remote sensing technology can improve land-surface and hydrologic modeling from three aspects, including model inputs (watershed information, atmospheric information, boundary conditions, etc.), state estimation (data assimilation), and model calibration and parameter estimation. This book aspires to stimulate further research into the remote sensing technology of hydrology analysis and water resources management.

This book is jointly supported by the National Natural Science Foundation of China (Grant No. 42122004), the Project of Tianshan Innovation Team in Xinjiang (202113050), and the Program for Foreign High-Level Talents Introduction in Xinjiang Uygur Autonomous Region (Y941181).
