Geophysical Aerial Measurements of Apparent Soil Resistivity

A display service shows apparent resistivity in a simplified break with 200 by 200 meter resolution. The map reflects the composition of bedrock and soil layers, produced from aerial measurements using the VLF method. Data is provided by Lantmäteriet under a CC0-1.0 license.

Use Cases

• Model subsurface geology based on apparent resistivity patterns.
• Identify areas with thin soil cover or high clay content based on depth sensing limitations.
• Calculate relative changes in ground conductivity from a presumed normal value of 5000 Ωm.
• Analyze bedrock resistivity in rocky areas using the VLF measurement method.

Strengths

• Data is collected via aerial VLF measurements recording amplitude and phase in three orthogonal directions.
• Apparent resistivity is calculated using a method developed by Becken and Pedersen (2003).
• The service provides a simplified visualization at a 200 by 200 meter resolution.

Limitations

• Row count is unknown, which may limit suitability assessment.
• Column-level documentation is absent; field semantics must be inferred after download.
• The apparent resistivity represents relative changes, not absolute values of soil resistivity.

Provenance

Source

Lantmäteriet

Collection Method

Aerial measurements using the VLF (Very Low Frequency) method.