Visual Tree Assessment

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Visual Tree Assessment (VTA) describes a method for systematic tree control in which various defect symptoms that deviate from the optimal shape of the tree are examined. The method was developed by Claus Mattheck , for which he received the 2003 environmental award from the Federal Environment Foundation .

method

The VTA method is based on the constant voltage axiom . The weak points of the tree are deduced from the growth reactions. If there is severe damage, trees are examined further to determine whether they are still safe to drive . The VTA method is carried out in partial steps. The axiom of constant tension, as a rule of fair load distribution, explains the formation of defect symptoms on the tree as repair attachments. In the VDI guideline 6224 from 2012, "Bionic Optimization", optimization methods based on the axiom of constant voltage are recommended. The usual procedure consists of:

  1. Visual inspection on
    • Tree environment,
    • Damage characteristics,
    • Vitality.
  2. Evaluation of the damage characteristics.
  3. If, after a visual inspection of the tree, there are doubts about the stability and break resistance, various examination devices are used such as sonic hammer or impact hammer , drilling resistance measuring device , incremental drill and fractometer .

With these examinations the extent of existing damage is determined and its effects estimated.

use

In the opinion of its proponents, visual tree assessment has also established itself as a recognized standard (in particular for fulfilling the duty of traffic safety ) in the case law .

The city of Berlin defines VTA as state of the art .

criticism

The VTA method is criticized as unscientific because it is based on subjective limit definitions from graphics, does not meet the requirement profile of the jurisprudence and trivializes the stability of trees. Mattheck and others consider these attacks refuted.

literature

swell

  1. ↑ The winners of 2003 ( Memento from October 5, 2006 in the web archive archive.today )
  2. ↑ Hötzel: "Culpable violation of the traffic safety obligation with trees - more legal security through the application of the Visual Tree Assessment (VTA) as a newly developed method of tree control", AgrarR 1996, 77; Ders .: Interventions on trees for the diagnosis and prognosis of diseases or damage, AgrarR 1997, 37. Ders .: Tree control to fulfill the traffic safety obligation, NJW 1997, 1757; Agricultural and Environmental Law 2012, 208
  3. ↑ "The tree control is to be carried out according to the current state of technology, experience and specialist knowledge. It has to be carried out according to the principles of the Visual Tree Assessment (VTA) method. ”Tree control regulation for Berlin. Official Journal for Berlin from February 4, 2011
  4. ↑ Franz Gruber: VTA slenderness constants are scientifically untenable , Pro Baum, Issue 4, 2007.
  5. ↑ Hans-Joachim Schulz: VTA and its technically reliable basics ( Memento of the original from November 5, 2016 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. @1@ 2Template: Webachiv / IABot / www.tree-consult.org
  6. ^ Franz Gruber: The VTA-RW / R limit rule for tree throwing, another scientifically incomprehensible and practically inadequate criterion of failure of stability , agricultural and environmental law, 3/2007.
  7. ↑ Claus Mattheck and Klaus Bethge: “Reply to the contribution by Prof. Dr. Franz Gruber, The VTA 0.32 residual wall thickness rule, scientifically untenable and practically unusable. “AUR 2007, p. 6 ff. In AUR 2007, p. 223
  8. ↑ Claus Mattheck and Klaus Bethge: “Reply to the contribution by Prof. Dr. Franz Gruber, the VTA-Rw / R limit rule for tree litter, another scientifically incomprehensible and practically inadequate failure criterion for stability. ”AUR 2007, p. 73 ff. In AUR 2007, 224 f.
  9. ↑ Claus Mattheck and Klaus Bethge: Reply to the article by Franz Gruber: "The scientifically incomprehensible VTA-h / D = 50 limit constant, a hardly usable, unjustifiable traffic safety criterion." AUR 8/2007 in AUR 2007, 399 ff.
  10. ↑ Nicolas A. Klöhn: "Scientific misunderstandings" - statement on "VTA slenderness constants are scientifically untenable" by F. Gruber in Pro Baum 4/2007. Online at Baumdiagnostik.de, accessed on January 23, 2017 (PDF; 365 kB)
  11. ↑ Prof. Dr. Siegfried Fink: Expert opinion on the attacks by GRUBER on the VTA method developed by MATTHECK and employees for assessing the traffic safety of individual trees. Retrieved March 30, 2017 .

Web links

  • mattheck.de Website for the Visual Tree Assessment method by Claus Mattheck