3. Elements of the TDRH version 2 package

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

3.1. Program Library

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

• create_octree_mesh_td_v2: creates an OcTree mesh based on the survey geometry

• tdrh_v2: used to forward model or invert TEM data

Also included are the following OcTree utility programs:

• blk3cellOct: creates conductivity models on an OcTree mesh

• interface_weights: creates weights on the faces of cells

3.2. Main Input Files

Here, we describe the main input files for executables contained with the TDRH version 2 coding 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 TDRH 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. Observations File
• 3.3.3. Predicted Data File
• 3.3.4. Time Channels File
• 3.3.5. Transmitter/Receiver 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. Wave File