The LS-HYDRO consortium brings together cutting-edge science from two complementary research fields, terrestrial laser scanning (TLS) and ecosystem modeling, to link boreal forest structure and their hydrological function at unprecedented detail. We propose that by combining dense spatiotemporal TLS time series, high-resolution satellite data, and advanced biophysical ecohydrologic models we have a high potential to transform the understanding on how tree, forest stand and landscape structure affect and interact with the hydrological cycle in boreal forest. We advance the high-resolution techniques to observe vegetation structure and hydrologic state and develop tools and means to measure and predict water fluxes from tree to regional scales. The new knowledge, data and techniques that can be transferred to other other biomes, climates and applied widely in environmental monitoring. The resultus promote development of resilient forestry and water-resource management.