iMOD User Manual version 5.2 (html)


A SPF-file describes the variation in the top and bottom elevation along a cross-sectional line. Each SPF-file can be alternated individually within iMOD or within regular text editors, such as NotePad. The latter is not recommended however.


Number of coordinates that describe the cross-sectional line. Number of solids, tops and bottoms.


Enter NCRD number of coordinates X and Y.


Total length of the cross-section. This is used (and updated whenever the coordinates X and Y are adjusted inside and/or outside iMOD) to avoid any adjustments of the elevations outside the outer limit of the cross-sectional line.

NP{i}, CLR{i},
LT{i}, LN{i}, LA{i}

  • • NP{i} Number of alternations of the top (i =uneven) or bottom (i =even) elevations.

  • CLR{i} is the line colour. The colour number for a colour display of 16 million colours calculated by formula IRED + IGREEN*256 + IBLUE*256*256 (IRED, IGREEN and IBLUE range from 0-256).

  • LT{i} is the line thickness (between 1 and 10).

  • LN{i} is the line name and LA{i} an indicator if the line is active.
    The i relates to the i\({}^{th}\) top or bottom IDF as mentioned in the SOL-file that directs to this SPF-file.


The distance from the first coordinate (X1,Y1) of the cross-sectional line, followed by the vertical position of the elevation (top or bottom).


On the last line of the SPF file it is possible to add a bitmap (*.jpg, *.bmp or *.png) that need to be attached to the cross-section. Specify the position of the bitmap by the x\(_1\),y\(_1\),x\(_2\),y\(_2\) variables. Note: Be aware that iMOD uses the upper-left corner as \(x_1,y_1\) and the lower-right corner as \(x_2,y_2\).