Update with data from the 2020 true ortho photo flight-campaign. These are preliminary results from work for NLPV (the Hainich National Park Administration) to map the stand gap dynamics for the full national park area based on multitemporal canopy height model data analysis (2018 vs 2019 vs 2020). More to follow. Since the strong defoliation and degradation of beech trees in 2019 some areas did not recover and exhibit now large stand gaps. For this work a difference-CHM was calculated and gaps were defined as at least 7m height in 2019 and showing at least 5m height difference in 2020 and an area value of at least one tree crown. We are right now also finishing the deciduous tree damage mapping for the year 2020.