Edi2Mare

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Edi2Mare is a little GUI to help you to convert EDI-files into the correct format to run inversions with MARE2DEM.

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# Edi2Mare

`Edi2Mare` is a little GUI to help you to convert EDI-files into the correct
format to run inversions with `MARE2DEM`. Its development has been sponsored by
**GEOTEM Ingeniería S.A. de C.V.** (<http://geotem.com.mx>) in Mexico City, and
it has been released to the public under the GNU General Public License V3. So
far it has only been used with files created with `ProcMT` and with `WinGLink`.

* `MARE2DEM` is a parallel adaptive finite element code for 2D forward and
  inverse modeling for electromagnetic geophysics. It was developed with
  funding support from the Scripps Seafloor Electromagnetic Methods
  Consortium, <http://mare2dem.ucsd.edu>.
* `ProcMT` is free and open-source software to process MT data, provided by
  Metronix Geophysics, <http://geo-metronix.de>.
* `WinGLink` is a multidisciplinary software program developed to process,
  interpret and integrate several geophysical disciplines in a unique
  interpretation model, developed by Schlumberger <http://www.slb.com>.

## Some warnings:

1. `Edi2Mare` was programmed in the Linux-version of `Matlab R2012b`. It was
   not tested outside this environment (not with other versions of `Matlab` nor
   on Windows/Mac).
2. `Edi2Mare` was created to solve a problem. However, there is lots of room
   for improvements. If you find `Edi2Mare` useful, and have the time to
   improve the code, then please go ahead!
3. `Edi2Mare` was only tested with `*.edi`-files from `ProcMT`, and
   `*.wln`-files from `WinGLink`.
4. There are apparently different possible formats for `*.wln`-files. At the
   moment, only two are supported. 4 header lines are expected for both, and
   the frequency values must be in the first column. Then, Rho XY, Phi XY, Rho
   YX, and Phi YX are expected either in columns {2, 3, 4, 5} or in columns {3,
   5, 7, 9}. In the first case, the file must have less than 9 columns. This
   part is fragile. If you have an issue with loading `*.wln`-files, have a
   look at the file `GUI/load_data.m` from line 230 onwards.

## Summary

With `Edi2Mare` you can:

* Prepare `*.edi`-files for `Mamba2D` and `MARE2DEM`; `Edi2Mare` will create
  the file `*.emdata`, which can subsequently be loaded with `Mamba2D`.
* Correct for *Static Shift* by using *TEM*-data; automatic estimation is
  possible.
* You can use `*.wln`-files, exported from *WinGLink*, instead of `*.edi`-files.
* Adjust the altitude of the receivers, *Z-shift* (`MARE2DEM` requires that all
  receivers are in the subsurface).
* Define the inversion-line (0-point and angle) and select the receivers for
  this line.
* Select the frequency-band that goes into the inversion.
* Deselect bad data.
* Define error levels.
* Show Robert L. Parkers D+ approximation.

## User interface

Example screenshot:
![Image of Yaktocat](https://raw.githubusercontent.com/prisae/Edi2Mare/master/Edi2Mare.jpg)

I believe that `Edi2Mare` is simple enough so it does not require lots of
information. A few notes:

* **Installation:**
    - Just copy the whole repo to your computer, and add the path to your
      `MATLAB`-path.
    - `MARE2DEM` must be in your `Matlab`-path.
* To start `Edi2Mare`, just execute `Edi2Mare` in the `MATLAB` command line.
* Many elements will show additional information if you hoover over them with
  your mouse.
* To start, you have to click on `Load` in the section `Measurement`. There you
  can choose the folder where you have the `*.edi`- or `*.wln`-files, and
  optionally the `*.tem`-files.

**Important points:**
  1. In the data-folder you need a file `coordinates.txt`. The format of this
     file is:

> Name        Easting         Northing      Altitude

For instance:

> 10_MT-1       749570.000      2224523.000      1620.125  
     > 11_MT-2       747507.000      2223857.000      1565.855  
     > 12_MT-3       745604.000      2224368.000      1526.000  
     > 13_MT-Test    755432.000      2222445.000      1795.514

2. The names of the `*.edi`-, `*.wln`-, and `*.tem`-files and the names of
     `coordinates.txt` have to start with the same 2-digit number, for instance:

* `13_mt_auto_processing_median.edi`
     * `13_NETEM.tem`
     * `coordinates.txt`

> 13_MT-Test     755432.000      2222445.000    1795.514

The part following the number (`##_`) in the names of `coordinates.txt`
     is used to name the receivers; in the example the used name for that
     receiver would be `MT-Test`.
     These names and the file-names may not contain spaces.
* Z-Shift is positive facing downwards (convention from `MARE2DEM`).
* The automatic *Fit* for the *Static Shift* is just a suggestion, not
  necessarily the best values; it is a minimization between MT and TEM data.
* North and East are given in kilometers in `Edi2Mare`.
* The angle of the inversion-line is counterclockwise, in degrees.
* The *System* is for instance `14 N`; the UTM Coordinate System.
* The errors are in %.

## `Edi2Mare` with data exported from `WinGLink`

The idea of `Edi2Mare` was to create the file `*.emdata` for `MARE2DEM` from
`*.edi`-files created with `ProcMT`. If you have MT data in WinGLink, there is
a possibility to use them for `Edi2Mare` too. You have to export the MT data
as `*.wln`-files: Open the data in `WinGLink` => `Soundings`, and then `Files`
=> `Edit data ...` => `File` => `Export to File...` and save them with the
ending `.wln`.  (Exporting `*.edi`-files does not work, because then you would
export the original file, without the changes you made in `WinGLink`.)

The functionality of `Edi2Mare` is limited if you use `*.wln`-files instead
of `*.edi`-files. You only see *Apparent Resistivity* and *Phase*, no
*Impedances*. D+ does not work either. However, it still works to create
the `*.emdata`-file and subsequently run an inversion with `MARE2DEM`.

Edi2Mare

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