Seequent AGS SPIA 2026.1.0 – Versatile Processing and Inversion Software for Ground-Based TEM and DC/IP VES Data

AGS SPIA is a versatile processing and inversion software developed by Seequent (a Bentley Subsurface Company), specifically designed for ground-based Time-domain Electromagnetic (TEM) and Direct Current/Induced Polarisation Vertical Electrical Sounding (DC/IP VES) data . It combines the robust and fast AarhusInv inversion code with a user-friendly graphical interface, enabling geophysicists to efficiently transform raw field data into reliable subsurface models.

The software supports a range of inversion methods, including Resistivity, Cole-Cole, and Maximum Phase Angle (MPA), making it particularly effective for TEM data affected by Induced Polarization effects . SPIA provides comprehensive data import capabilities for a wide array of TEM instruments and DC/IP configurations, along with powerful visualization and export tools for delivering results in PDF, PNG, CSV, and ASCII formats.

SPIA 2026.1.0 is a compatibility-focused release that does not introduce new features but delivers updates to maintain platform stability and ensure compatibility with connected workflows, including continued support for the Seequent Connector following its latest update.

Primary Users

AGS SPIA 2026.1.0 is designed for geophysicists, exploration geologists, hydrogeologists, and environmental scientists who specialize in subsurface imaging using ground-based electromagnetic and electrical methods . It serves professionals who:

  • Process and invert Time-domain Electromagnetic (TEM) data for mineral exploration, groundwater studies, and environmental investigations

  • Analyze Vertical Electrical Sounding (VES) data using Direct Current (DC) and Induced Polarization (IP) methods

  • Interpret complex subsurface resistivity and chargeability models for geological mapping and resource delineation

  • Work with data affected by Induced Polarization effects in TEM surveys using advanced inversion methods 

  • Generate professional reports and visualizations from processed geophysical data

Key Features & Capabilities

Efficient and Reliable Inversion

  • AarhusInv Integration: Leverages the fast and automated AarhusInv inversion code for reliable and efficient TEM data inversion 

  • Multiple Inversion Methods: Supports Resistivity, Cole-Cole, and Maximum Phase Angle (MPA) inversions, catering to TEM data affected by IP effects 

  • User-Friendly Graphical Interface: Enables simplified data processing and direct editing of data and models within the software 

TEM Data Processing

  • Advanced Visualization: Offers multiple plotting options for electromagnetic data in various units, including raw dB/dt, stacked dB/dt, and apparent resistivity 

  • Comprehensive Instrument Support: Compatible with many TEM instruments and data formats 

  • Robust Processing Tools: Includes comprehensive noise and spike filtering to ensure data clarity and accuracy 

DC/IP VES Data Processing

  • Simplified Import and Analysis: Supports a wide range of file formats and electrode configurations for DC and IP data 

  • Four-Electrode Configurations: Accommodates all four-electrode configurations commonly used in VES surveys 

  • Abem SAS Instrument Support: Facilitates data import from Abem SAS instruments 

Data Export and Reporting

  • Multiple Export Formats: Export processed data and inversion models to PDF, PNG, CSV, and ASCII formats 

  • Precise Data Localization: Supports EPSG coordinate systems and Open Street Maps for accurate spatial referencing 

  • Integration: Compatible with Aarhus Workbench Essentials for enhanced data representation 

What’s New in SPIA 2026.1.0

Version 2026.1.0 is a compatibility-focused release :

  • No New Features: This release does not introduce new functionality.

  • Platform Stability: Delivers updates to maintain platform stability.

  • Workflow Compatibility: Ensures compatibility with connected workflows, including continued support for the Seequent Connector following its latest update.