VOXI Earth Modelling
Learning Resources

Requires Oasis montaj 7.5 or higher

 

 

How to Begin Using VOXI

Getting started with VOXI
Getting started with VOXI

Topics include loading the VOXI menu, setting up a new VOXI session, and adjusting the parameters required to run an inversion.

Runtime: 5:00
How to use the VOXI Viewer
How to use the VOXI Viewer

An introduction to the VOXI Viewer environment -- the location of useful tools and how to manipulate the project view.

How to create a new session from a Polygon in VOXI
How to create a new session from a Polygon in VOXI

Learn what input files are required to create a new VOXI session from a Polygon.

How to create a new session from a Voxel in VOXI
How to create a new session from a Voxel in VOXI

Learn what input files are required to create a new VOXI session from a Voxel.

How to prepare data for import in VOXI
How to prepare data for import in VOXI

Learn the steps required to put your data in the correct format (database or grid) to use in VOXI.

 

How to add data using default values in VOXI
How to add data using default values in VOXI

Learn how to add your data to the VOXI session.

How to add data and assign error values in VOXI
How to add data and assign error values in VOXI

Learn how to specify the appropriate fit error to your data in VOXI.

How to add data and remove the background trend in VOXI
How to add data and remove the background trend in VOXI

Understand the various background/trend removal options in VOXI.

How to modify the mesh parameters in VOXI
How to modify the mesh parameters in VOXI

Learn how to modify the inversion mesh geometry in VOXI.

Introduction to VOXI Earth Modelling
Introduction to VOXI Earth Modelling

Geosoft VOXI Earth Modelling enables you to quickly generate a 3D voxel model from your gravity and magnetic data using inversion or forward modelling. This video will show you what VOXI is and how it works.

Runtime: 3:32

Workflow Overviews

How to create an inversion model in under 4 minutes
How to create an inversion model in under 4 minutes

Learn how to use VOXI Earth Modelling to set up and run a geophysical susceptibility inversion in minutes.

How to run a Forward Model using VOXI
How to run a Forward Model using VOXI

Learn how to run a forward model in VOXI.

Runtime: 3:23
How to run an unconstrained inversion
How to run an unconstrained inversion

Learn how to run an unconstrained inversion in VOXI.

Runtime: 6:05

Applying Constraints

VOXI Earth Modelling How to use the Drillhole Constraint Builder
VOXI Earth Modelling How to use the Drillhole Constraint Builder

The drillhole model building tool in VOXI allows you to easily integrate your drillhole data into an inversion as a parameter reference and parameter weighting constraint.

Constrained Voxel Inversion using the Cartesian Cut Cell Method
Constrained Voxel Inversion using the Cartesian Cut Cell Method

How to define an upper/lower bound constraint in VOXI
How to define an upper/lower bound constraint in VOXI

Learn how to define an upper or lower limit to your physical property using our upper/lower bound constraint builder.

How to define a reweighting (IRI) model constraint in VOXI
How to define a reweighting (IRI) model constraint in VOXI

IRIF provides a means of achieving a less smooth (and often more geologically reasonable) inversion result from VOXI, with little time and effort. Learn how to apply IRIF here. 

Updates to Iterative Reweighting Inversion (IRI) in VOXI Earth Modelling 8.0.1
Updates to Iterative Reweighting Inversion (IRI) in VOXI Earth Modelling 8.0.1

This video shows the updated Iterative Reweighting Inversion Focussing (IRIF) tool in VOXI Earth Modelling 8.0.1. IRIF allows you to focus your inversion result towards the positive and/or negative end of the property distribution.

How to define an active model constraint in VOXI
How to define an active model constraint in VOXI

The active model constraint enables you to define which regions of a model you wish to change during an inversion. Learn how to use it here.

How to create constraints voxels using voxel math for use in VOXI
How to create constraints voxels using voxel math for use in VOXI

In some situations you may wish to use Voxel Math to create constraints in VOXI. Learn how to do so here.

How to define a starting model constraint in VOXI
How to define a starting model constraint in VOXI

The starting model constraint allows you to define the type of model you would like to begin the inversion process at. Learn how to use it here.

How to run an inversion with an upper bound constraint
How to run an inversion with an upper bound constraint

Learn how to constrain an inversion by means of applying an upper or lower limit to your physical property.

Runtime: 7:59
How to run an inversion with gradient weight constraints
How to run an inversion with gradient weight constraints

Learn how to enforce sharp contrasts in physical property across contacts or boundaries within VOXI.

Runtime: 10:29

Viewing Inversion Results

How to export the inversion parameters in VOXI
How to export the inversion parameters in VOXI

Learn how to export the parameters used in your inversion so you can re-use and modify as needed for later sessions or for reference.

How to export your VOXI Earth Modelling inversion results
How to export your VOXI Earth Modelling inversion results

Learn how to export inversions results into 3D maps and databases.

How to compare inversion results to observed data in VOXI
How to compare inversion results to observed data in VOXI

Learn how to compare the predicted data from your inversion result to the observed data in Oasis montaj, in order to assess the quality of your result.

How to use the VOXI inversion journal
How to use the VOXI inversion journal

VOXI contains a useful feature which enables you to keep notes on the different inversions you may run within a VOXI session; learn how it works here.

Technical Presentation

Top 5 Inversion Best Practices: Episode 3 - Impactful Constraints
Top 5 Inversion Best Practices: Episode 3 - Impactful Constraints

In episode 3, you'll learn about the 5 most impactful constraints and how to implement them to improve your inversion results. You'll learn what upper and lower bounds do, how parameter reference and weighting models work, and when to use gradient reference and weighting constraints.

Top 5 Inversion Best Practices: Introduction to Inversion
Top 5 Inversion Best Practices: Introduction to Inversion

In the introductory video, we will cover some of the fundamental ideas and equations behind inversion theory as applied to VOXI – giving you the background you need for a deeper understanding of the best practices outlined.

Top 5 Inversion Best Practices: Episode 1 - Auxiliary Parameters
Top 5 Inversion Best Practices: Episode 1 - Auxiliary Parameters

In this episode, you will learn why auxiliary parameters are the most important, and often most overlooked inputs to your inversion modelling. See how to determine the best cell size; understand why we recommend optimum data sampling; learn when to use absolute and relative errors; and find why trend removal can dramatically improve your inversion results.

Top 5 Inversion Best Practices: Episode 2 - Inverting Large Datasets
Top 5 Inversion Best Practices: Episode 2 - Inverting Large Datasets

In episode 2, you'll learn how to improve the speed and accuracy of your large, regional-scale inversions. We'll discuss the radius of influence and computational accuracy settings in VOXI – explaining our defaults and when you may want to change them.

Auxiliary Information in Geophysical Inversion - ASEG 2013
Auxiliary Information in Geophysical Inversion - ASEG 2013

The presentations in this video showcase work done by Rob Ellis and Ian MacLeod of Geosoft Incorporated and Peter Diorio of GeophysicsOne to demonstrate the importance of auxiliary information in geophysical inversion. This video is presented by Robert Ellis from the ASEG-PESA 2013 Conference Inversion Forum workshop.

0:00 Introduction
2:06 What is the Auxiliary Information?
11:11 Model Cell Size
22:51 Upward Continuation and Cell Geometry
30:25 The Padding Domain
37:52 Trend Removal
42:54 Error Type and Misfit Distribution
49:12 Errors and the Regularization Parameter
1:03:41 Model Weighting
1:11 Conclusions

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