Why Mapping Tree Roots Matters?
Trees deliver enormous value – especially in urban environments. Mapping their root systems with Ground Penetrating Radar (GPR) helps protect that value during for example construction and maintenance work. Trees capture airborne particles, absorb carbon dioxide, and improve air quality. They provide shade, lower city temperatures, and help manage stormwater by absorbing and slowing down rain and meltwater runoff. For biodiversity and human well-being alike, trees are essential.
Yet urban trees face serious threats whenever subsurface infrastructure expands or requires maintenance. Uncontrolled digging can damage root systems so severely that trees cannot survive – and replacing a mid-grown tree carries a significant cost today.
Careful manual excavation or vacuum excavation can reduce this risk, but both methods work far more efficiently with a detailed map of the root layout in hand.
How GPR Detects and Maps Tree Roots
Ground Penetrating Radar (GPR) works by transmitting electromagnetic waves into the ground. When those waves encounter a change in electrical properties – such as the transition from sandy soil to a tree root – they reflect back to the antenna. The GPR records these reflections, and tree roots typically produce a characteristic signature in the resulting radargram known as a hyperbola.
Why 3D Multi-Channel GPR Delivers the Best Results
Tree roots wind in multiple directions, vary in depth, and form complex web-like networks – which makes a 3D multi-channel GPR solution the most effective tool for this work. A 3D GPR system collects dense, parallel profiles and generates a rich data volume ideal for interpolation, producing high-resolution depth slices of the entire root system.
An example of a red oak root system as seen in MALÅ Vision. The tree is located on the bottom left-hand side. Data collected with MALÅ MIRA Compact. Credits to TerraSearch Geophysical for the data set.
The resulting data supports multiple output formats: export a georeferenced TIFF for use in GIS or CAD software, or trace individual roots and export them as polylines in DXF, TXT, or CSV format.