3. Elements of the Program E3DMT

This section provides a brief description of each program in the E3DMT version 2 library. In addition, we describe the file formats for all input and supporting files used by the coding library.

3.1. Executables

The main executable programs within the E3DMT version 2 program library are:

• e3dmt_v2: Is used for both forward modeling and inverting natural source electromagnetic data

• create_octree_mesh_e3dmt_v2: Creates the OcTree mesh from survey geometry

Mesh utilities that can be used in conjunction with this package include:

• blk3cellOct: Creates simple block conductivity models on the OcTree mesh

• interface_weights: Creates interface weights for inversion

3.2. Main Input Files

Here, we describe the main input files for executables contained with the E3DMT version 2 package.

• 3.2.1. Create octree mesh
• 3.2.2. Create octree model
• 3.2.3. Forward modeling
• 3.2.4. Create face weights
• 3.2.5. Inversion

3.3. Supporting Files

Here, we describe the formats of supporting files used to run E3DMT executable files. The input files for each executable program are described in the running the programs section.

• 3.3.1. Survey Index File
• 3.3.2. Receiver File
• 3.3.3. Frequencies Files
• 3.3.4. Predicted Data File
• 3.3.5. Observations File
• 3.3.6. Topography File
• 3.3.7. Octree Mesh File
• 3.3.8. Model File
• 3.3.9. Model and Face Weights Files
• 3.3.10. Bounds File