iMOD User Manual version 4.4 (html)

9iMOD Files

This chapter describes the types of files used by iMOD.

Below a summarizing table of all file types used by iMOD is given; per file type it includes a short description of it’s purpose. iMOD uses both generally known file types (e.g. bitmap BMP-files, ESRI-shape files, NetCDF-files) and iMOD-specific file types; the latter group of files is described in detail in Section 9.1 - Section 9.4. The table includes links to the related sections in this chapter or other sections in this user manual, or links to external sources.



Reference in  
this manual



Section 9.1

iMOD Preference File (ASCII):
File containing the initial settings for iMOD.


Section 9.2

iMOD-MetaFile (ASCII):
File containing information to display selected maps including legend and topographical overlays.


Section 9.5

iMOD Data-File (BINARY):
Raster file, containing information on a raster with evenly or non-evenly distributed rows and columns. Format is specific for iMOD and developed to handle large sized data sets in a time-efficient way. Besides geographical information, IDF-files can handle meta-data as well (such as descriptive information).


Section 9.6

iMOD Multi-Data-File (ASCII):
This file contains several references to IDF-files. Whenever IDF will be grouped they will be collected into a MDF-file.



Section 9.7

iMOD Point-File (ASCII):
File containing the information on points. An IPF-file can direct to several *.TXT files that contain timevariant information (such as timeseries) or vertical descriptions (such as drilling logs or cone penetration test logs).


Section 9.8

iMOD Flow-File (ASCII):
File containing the information that result after computing flow-lines within iMOD. It describes mainly lines in 3D-coordinates with their age and velocity.



Section 9.9

iMOD Segment-File (ASCII):
File containing the information to describe a line/segment for river modeling. An ISG-file directs to an ISP-file (containing the actual coordinates of the segment), an ISD#-file (containing timevariant information on e.g. waterlevels), an ISC#-file (containing information on the cross-section of the segments) and *.IST# (containing timevariant information on e.g. waterlevels at weirs and/or water structures)



Section 9.11

(both ASCII):
ESRI Generate File that described line elements, e.g. lines, polygons (closed lines). For polygons, *.DAT can be included that contain information for polygons. iMOD has its own GEN file type which is a BINARY format of a combination of the conventional GEN and DAT file.


Section 9.13

Comma Seperated Values file. It stores tabular data (numbers and text) in plain text. Each line of the file is a data record. Each record consists of one or more fields, separated by commas. The use of the comma as a field separator is the source of the name for this file format.


Section 9.14

An ASCII format based ESRI grid, also known as an ARC/INFO ASCII GRID. (A binary format is widely used within Esri programs, such as ArcGIS.) The ASCII format is used as an exchange, or export format, due to the simple and portable ASCII file structure.


Section 9.16

iMOD Legend File (ASCII):
File containing information on classes and colours used by iMOD to display an IDF, IPF, IFF and/or GEN.


Section 9.17

iMOD Colour File (ASCII):
File containing the initial colour used by iMOD


Section 9.18

File containing color information to display boreholes



Section 9.19

iMOD Coordinate File (ASCII):
File that directs to other files depending on the zoom levels.


Section 9.20

An ISD-file contains information about the location of startpoints used in the calculation of pathlines from model output.


Section 9.21

iMOD SOLid project file (ASCII):
File containing the layer definitions of a solid


Section 9.22

A SPF-file describes the variation in the top and bottom elevation along a cross-sectional line.


Section 9.23

File describing the operations that need to be carried out by ISG Edit.


Section 9.4

A time step configuration file.


Section 5.5

iMOD Project File (ASCII):
File containing the characteristics of files used in a model simulation.


Chapter 10

iMOD Runfile (ASCII):
File used to run a model simulation with iMODFLOW. An iMOD Runfile may be generated from an iMOD Project File


Section 7.10.1,
Section 7.11.1

iMOD Initialization File (ASCII):
File containing specific information for particular parts of iMOD, such as the ScenarioTool and the QuickScanTool. The syntax is comparable to the *.INI-files of Windows.


Section 5.1

iMOD Mask-File (BINARY):
File contains coordinates of a rectangular area that can be loaded into iMOD to zoom to that particular area.


Section 7.13

iMOD Startpoint Definition File (ASCII):



Window Bitmap (BMP), Portable Network Graphics Image (*.PNG), ZSoft PC Paintbrush, PostScript (*.PS) (all BINARY):
Export file containing the image of the current window.


NetCDF File (BINARY). More info:


Map file (BINARY):
A Map file is a binary data text file, which is mainly used as in-/output file of PCRaster. For more information about PCRaster go to:


Section 9.15

Array file (ASCII):
An array file is a text file, which is used as input file for iMODFLOW. It is generated by iMOD once the input is created for iMODFLOW. You can read in such a file directly in iMOD.


ESRI Shape File (BINARY). File containing topological information on lines, points, polygons.