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iMOD User Manual version 4.4 (html)


9.20ISD-files

An ISD-file contains information about the location of startpoints used in the calculation of pathlines from model output. An ISD-file can be created by IMOD using the Define Startpoints option from the Toolbox option on the main menu. The syntax of an ISD-file is as follows:

Delimiter line

ShapeName

Name of the shape, use quotes for a name containing more than one word

Delimiter line

Number, Shape-type

Shape Type Number, Type of shape. It is not allowed to change the shape type number, apply one of the following:
1027,POINT
1026,RECTANGLE
1025,POLYGON
1024,CIRCLE
1028,LINE
1139,GRID

Number1, Number2, Number3

Depending on the shape type these are defined as:
POINT
Number1 is radius of the circle around the point; Number2 is the distance between points on the circle, Number3 (0-1) is whether the coordinates need to be snapped to the nearest model node.
POLYGON
Number1 is the distance along the X direction; Number2 is the distance along the Y direction. They define the distribution of point in between the extent of a polygon. Number3 (0-1) is whether the coordinates need to be snapped to the nearest model node.
RECTANGLE
Number1 is the distance along the X direction; Number2 is the distance along the Y direction. The define the distribution of point in between the extent of a rectangle. Number3 (0-1) is whether the coordinates need to be snapped to the nearest model node.
CIRCLE
Number1 is the radius of the circle; Number2 is the distance between points on the circle, Number3 (0-1) is whether the coordinates need to be snapped to the nearest model node.
LINE
Number1 is the distance between points along the line (Number2 and Number3 are obsolete)
GRID
Number1 is the vertical offset of points, apply zero to put the points on the values of the grid (top-level file) (Number2 and Number3 are obsolete).

Top-level file /
Numeric value

IDF-file defining the top level at which startpoints are defined or
Numeric value defining the top level at a constant elevation. This is obsolete for the GRID type.

Bottom-level file /
Numeric value

IDF-file defining the bottom level at which startpoints are defined or
Numeric value defining the bottom level at a constant elevation. This is obsolete for the GRID type.

Ireference, Reference level file /
Numeric value

Number indicating whether a reference level is used
0 = reference level is not used;
1 = reference level is used. The Reference level file defines the level at which startpoints are defined or
Numeric value defining a constant reference level. This is obsolete for the GRID type.

Vertical interval number

The number of points to be used between the specified top-level and bottom-level.

Delimiter line

No. Points Shape

Number of points of the defined shape. This is obsolete for the GRID Shape Type.

Xcrd,Ycrd

X- and Y-coordinates of the shape. For a POLYGON these are all points of the polygon, for a CIRCLE this is the centre of the circle and a point on the radius, for POINT these are individual point values. for RECTANGLE these are the lower-left corner and the upper-right corner, for a LINE these are all points on the line. This is obsolete for the GRID type.

Delimiter line

Example of an ISD-file:

==================================================
1 <-Shapename
————————————————–
1025,POLYGON
25.000,25.000
“-1”
“-2”
1,“D:\MODEL \TOP_L1.IDF”
5
————————————————–
5 <-No. Points Polygon
486132.237,5999078.312
409823.362,6069282.500
542600.862,6186798.125
693692.362,6165431.625
713532.737,6031128.062
==================================================
==================================================
2 <-Shapename
————————————————–
1024,CIRCLE
100.000,25.000
“D:\MODEL \TOP_L1.IDF”
“D:\MODEL \BOT_L1.IDF”
0
1
————————————————–
1 <-No. Points Circle
574650.612,6272264.062
==================================================
==================================================
2 <-Shapename
————————————————–
1139,GRID
0.0
“D:\MODEL \TOP_L1.IDF”