Shadow-based derivation of the trunk diamter
The method to be developed in Shadow enables the cost-effective (low-cost drone hardware and fast data acquisition) and area-wide recording of stem diameter at breast height (1.3 m) in deciduous or sparse forest stands. The basic population, i.e. all individual trees, is recorded. In combination with the tree height, which can also be determined by this method, the wood stock as a valuable material and the bound carbon can be determined more precisely and much more efficiently than before. Conventionally, log diameters have so far been determined e.g. by Klubbe (caliper gauge) or angle counting sample. As a rule, small samples are recorded under the assumption that they are representative of the entire forest stand. This is associated with great uncertainties, especially in view of the typical heterogeneity in deciduous forest stands. In addition, a time-consuming inspection of the forest stands is necessary. The method proposed here also offers the possibility of determining the stem diameter at additional heights, which improves the accuracy of the stem volume calculation and is also relevant for further research. An example is the improvement of site-specific allometric relationships.
Potential users and customers include forest owners, the timber industry, forest managers in general, national parks, forest scientists, climate researchers, forestry institutions, nature and environmental associations and civil society in general (involved through Citizen Science).
Project runtime: 2021 - 2022
Spokeperson: apl. Prof. Dr. habil. Christian Thiel