Tree stem diameter estimation using inexpensive UAV photogrammetric data and Monte Carlo methods

As the Boreal climate shifts towards warmer temperatures and more unpredictable precipitation patterns, forest management needs to become more efficient and climate-friendly. We monitored a managed Finnish spruce forest on peat soil for two summer seasons characterized with severe drought episodes. A wide range of data was used, including CO₂ exchange, evapotranspiration, tree growth, meteorology and UAV maps. Clear, but complex responses to drought on different spatial scales were revealed.