Dendrology +

level 02

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.

What use will the data be to you?

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.

When is Adbian Dendrology + to be used?
What data will the tool provide you with?
outputs

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.

Analytical 3D model
Safety coefficient
Additional reports

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.

try Abdian dendrology +
If you want to try
this level, contact
your arborist
Comparison of functionality
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Full comparison in PDF
level 01
Dendrology
level 02
Dendrology +
level 03
Stem Scann
level 04
Device testing
Creating a 3D tree model
Based on dendrometric parameters
Based on photographic analysis
Based on 3D scan + photographic analysis
Based on 3D scan + photographic analysis + instrument test results
Stress analysis simulation
Simplified
Simplified
Yes
Yes
Calculation of the safety coefficient
Yes
Yes
Yes
Yes
Recommendations for interventionfor possible stabilisation
Simplified
Simplified
Yes
Yes
Trunk inclination measurement (repeated collections)
-
Yes
Yes
Yes
Crown shape
Based on diameter and shape by tree taxon
Diameter and eccentricity based on photographic analysis + shape according to tree taxon
Precise shape based on photographic analysis
Precise shape based on photographic analysis
Stem shape
On the basis of the strain run
Based on photographic analysis
Based on 3D scan + photographic analysis
Based on 3D scan + photographic analysis
Analysis of the extent of open cavities
-
-
Yes
Yes
Ideal use case
Young and mature trees without significant trunk and crown irregularities
Young and mature trees with irregularity in the crown, trunk or growing at an angle
Mature and senescent trees (including monumental trees) with irregularly formed crown, trunk, possibly with open cavities and other defects on the trunk
Mature and senescent trees (including monumental trees) with irregularly formed crown, trunk, possibly open cavities and other defects on the trunk for which instrumental tests (tomograph/pull test) are used
Average percentage of tree population (%)
90%
15%
5%
1-2%