Important

In the spring of 2022, a new suite of FDEM OcTree codes were compiled: E3DRH, E3DRH v2 and E3DRH v2 tiled. These codes use a right-handed coordinate system; as opposed to the modified left-handed coordinate system used by E3D, E3D v2 and E3D v2 tiled. You are currently viewing the manual for the package which uses ‘e3drh.exe’ to forward model and invert FDEM data. The manual for the original E3D v1 package (which uses ‘e3d.exe’) can be found here .

E3DRH Version 1 Package

E3DRH version 1 is a program library for carrying out forward modelling and inversion of frequency domain EM data over 3D structures. The contents of this manual are as follows:

• 1. Package overview
  • 1.1. Description
  • 1.2. Program Library Content
  • 1.3. Licensing
  • 1.4. Installing E3DRH
• 2. Background theory
  • 2.1. Fundamental Physics
  • 2.2. Octree Mesh
  • 2.3. Discretization of Operators
  • 2.4. Forward Problem
  • 2.5. Sensitivity
  • 2.6. Inverse Problem
• 3. Elements
  • 3.1. Program Library
  • 3.2. Main Input Files
  • 3.3. Supporting Files
• 4. Running the programs
  • 4.1. OcTree Mesh Generation
  • 4.2. Creating Octree Models
  • 4.3. Forward Modeling
  • 4.4. Additional Cell and Face Weights
  • 4.5. Inversion
• 5. Examples
  • 5.1. Create octree mesh
  • 5.2. Create octree model
  • 5.3. Forward modeling
  • 5.4. Inversion
• 6. References