 The rapid development of Earth observation capabilities over the last few years has opened up a wealth of new possibilities, for understanding our planet's hydrology. From CubeSats to UAVs to smartphones, there are now many different ways to collect data about the environment, ranging from high-resolution imagery to detailed measurements of atmospheric conditions. These new sources of data provide us with a much greater understanding of the Earth's surface and atmosphere, allowing us to better understand processes like evapotranspiration, flooding, and soil moisture dynamics. However, the sheer volume of data generated by these new sources presents challenges in terms of data processing and analysis. We must find ways to make sense of all this data and turn it into actionable information. This article was authored by M. F. McCabe, M. Rottel, D. E. Alstorf and others.