Visual Tree Assessment
according to Prof. Dr. Claus Mattheck

The VTA method is an internationally spread and acknowledgment method for tree inspection, hazard symptoms are construed, defects are confirmed and measured and criteria of failure are assessed. VTA helps to distinguish apparent hazardous trees from those that are really hazardous. This way safe trees are protected.

VTA gives information about the body language and the mechanics of trees and instructs you in the correct use of our test and measuring instruments.

Advantages of the VTA-Method

The VTA method is applied all over the world. The main focus of the VTA method is to understand the body language of trees. Sound or drilling techniques are used only for defect confirmation and surveying. Those who know the body language of trees can distinguish hazard trees from only apparent hazard trees and thus cut fewer trees while increasing traffic safety.

As a result, justified liability claims can be satisfied and unfounded ones averted. The VTA method is thus neither tree-friendly nor tree-hostile. In the event of damage, this method enables a largely fair judgment tobe reached.

The partial stages of the VTA-method

1. Symptom detection

Body language of trees
Growth defects
Appearance of the bark
Crown and leaves
Fungal fruiting bodies and their body language
Local environment of the tree

2. Confirmation of defects and measurement

Drilling Resistance Measurement (IML-RESI Systems)
Sound velocity measurement (IML Micro Hammer)
Measurement of the wood strength (Fractometer)
Annual ring analysis (IML Measuring Table)

3. Assessment of the defect

Criteria of failure for hollow or decayed trees
Criteria of failure for root damages
Criteria of failure for trees that are healthy but high trees (H/D ratio!)

4. Determination of further actions

Mechanical aid (crow securing system, stilts,…)
Replacement of the tree

Measuring systems for the VTA-Method

  • IML-RESI MD300
    IML-RESI MD300

    The IML-RESI MD300 is a driling instrument working purely mechanically that does not record a measurement curve, neither electronically nor mechanically. The user feels the result and can read the penetration depth on the 300 mm scale. Often an abrupt and fast penetration is perceptible when the instrument detects a rot zone. Even the annual rings of conifers can be noticed.

  • IML-RESI F-Series
    IML-RESI F-Series

    The IML-RESI F series is driven by an usual drill and is very easy to handle The instrument is cordless and therefore ideal for difficult operating conditions. The measurement profile is recorded simultaneously to the drilling depth on wax paper strip.

  • IML-RESI PowerDrill ®
    IML-RESI PowerDrill ®

    The IML PowerDrill® is equipped with an electronic unit that gives clear support in taking, documenting and evaluating measurements. It can be used wherever reliable and meaningful measurements are required.


Our VTA Seminars

Aktuell sind keine Seminare verfügbar.

Articles about tree inspection