iMOD User Manual version 4.4 (html)

5.6Subsurface Explorer

The Subsurface Explorer tool can be used to import prepared subsurface data of the Netherlands into iMOD. The data that can be loaded are stored in a database, of which the path has to be specified in the IMOD_INIT.PRF file using the keyword SUBSURFEXDBASE. Furthermore, the path to the 7-zip executable on the users computer also has to be specified in this file using the keyword 7ZIP, see Section 9.1 for more information.

Subsurface Explorer window:


Current Position

Shows the current mouse position on the map in RD coordinates.


Navigation buttons for the map
Use these buttons to adjust the view of the map. The buttons can be used to zoom in, to zoom out, to move the map by dragging and to reset the map to the original view, respectively.


Delete a project
Select an existing project in the Select project listbox and click this button to delete the project.

Create a new

To create a new project enter a new name in the Select project listbox.

Use an existing

To continue using an existing project select it by clicking the name once in the Select project listbox.


Draw a polygon
Click this button to be able to draw one or more polygons on the map. To draw a polygon, click the left mouse button to place points and click the right mouse button to stop drawing. When the polygon is finished the tool will select the cells corresponding to the polygon.


Import a polygon from file
Click this button to open a *.GEN file containing one or more polygons. The polygons will be drawn on the map and the corresponding cells will be selected.

Select data

This list shows the available data. Select one or more data types from this list you would like to load.

Clear project first

Select this option to first clear the data in an existing project before loading the selected data.

Merge with project

Select this option to merge the selected data with the data already present in an existing project folder.


Load the data
Click this button to load the current selection. The tool will check whether all required information is present.

Note: The window can be resized by dragging the edges in order to adjust the size of the map. When using polygons to select cells, the data will not be clipped to the polygon, it is only used to select the cells. A *.SHP file can easily be converted to a *.GEN file in order to be able to use it in the Subsurface Explorer. Simply open the file in iMOD as an overlay (iMOD Manager) and the *.SHP file will automatically be converted to a *.GEN file, which will be placed in the same directory.


The database that contains the data that is imported using the Subsurface Explorer tool should be structured as the above figure shows:

Examples of dataset settings-files
Example AHN

This means that the AHN-dataset contains files of the filetype *.IDF and no predefined legend-file (*.DLF) is provided.

Satellite image

In this example satellite images are stored as *.png files and will be available via the iMOD TOPO-tool.

Example DINO boreholes - header file

iMOD will merge all IPF-files to one large IPF-file and putting these header lines on top of the final IDF-file. In this example the header lines stand for: 1. filetype, 2. legend provided (1=yes, 0=no), 3. amount of IPF-files to be merged, 4.-8. column names, 9. IPF attribute file types with the needed information given in column 3.