The second level of the tree stability analysis enables a significant increase in the accuracy of the tree stability calculation thanks to the assessment of the tree stem tilt and the distribution of the crown volume (assymetry). More accurate calculation uses calibrated photographs providing a range of dendrometric parameters, the detail and processing of which goes well beyond a simple visual assessment. In the second level of the investigation, the 3D model is already created based on the analysis of calibrated photographs, which provide the opportunity to capture the individual shape characteristics of the trunk's load-bearing elements more accurately and comprehensively. In contrast to the first level, the Dendrology+ works best with repeated assessment of the tree, when the tilt of the stem can be analysed using a rod model. The complete analysis allows users to assess the resistance of the tree to uprooting, which until now could only be quantified using selected device-supported tests.
By using this method as an addition to standard tree assessment, you will have the highest possible level of confidence that the trees in your management are safe and can continue to benefit their environment.The additional inclusion of the resistance to the uprooting parameter is an exceptional benefit that cannot be realized in routine tree surveys. You will also have the basis for proposing specific extent of stabilisation measures in case of damaged trees. By implementing appropriate measures you can thus avoid the unnecessary felling of many trees.
The Adbian Dendrology + tool is best used in combination with a visual tree assessment, especially for mature individuals with a leaning trunk or unevenly distributed (assymetric) crown. The use of the tool is also recommended in cases where a tree has been identified as being at risk in previous level of surveys. To perform this level of analysis, a mobile phone or tablet is necessary.
The main output of the analysis is again the safety coefficient, i.e. the value that determines the safety of the existence of a tree in a given location, with respect to the specific wind profile. As in the case of the previous level, the tool also provides a representation of the tree in a 3D environment, allowing the tree to be analysed in its growth context.Various reports are available to complement the analysis, such as volume analysis and eco-benefit calculations. An important advantage of theDendrology+ level is the possibility to analyze trunk tilt and to assess the resistance of the tree to uprooting based on repeated measurements.
The three-dimensional model allows one to visualize the size and structure of the tree in its growth context. For more advanced levels, the 3D model includes detailed documentation of the tree stem condition at the time of the field survey, possibly enriched by the results of the analysis of internal structures obtained through device-supported tests.
The safety coefficient is a value expressed as a percentage that defines the ratio of the strength of the supporting structures(especially the trunk) in relation to the stresses generated in them as a result of horizontal loading by strong winds. A safety factor value of less than 100 % indicates that the tree is insufficiently compensated for the conditions and may pose potential risk of failure. Results of the calculation of the safety factor cannot be used on their own without expert interpretation and the overall contexts evaluated by a qualified arborist.
In addition to the safety coefficient and the analytical 3D model, the collected data can be used for other valuable outputs. These include a volumetric analysis indicating the volume of biomass to be processed if the tree is felled, or a summary of the ecobenefits, i.e. the benefits of the tree to the environment. The range of reports is continuously expanding.