Forest  are structurally complex ecosystems threatened by climate change. In situ 3D imaging measurements provide unprecedented, quantitative, and detailed structural information that allows testing of hypotheses relating form to function. This affords new insights into both individual organisms and their relationship to their surroundings and neighbours. Within this project we aim to create new datasets of 3D detailed data using novel technologies, such as terrestrial laser scanning. By repeat measurements within the same study sites, these data are expected to give us new insights into forest dynamics and how changing environmental conditions might impact these dynamics in the long term.