IGEL2D

Basic Information

Name of Program

IGEL2D

Version-Date

October 2001

Description-Date

April 2008

Catchwords

preprocessor
bearing data
finite element grid
generate border

Short Description of Functionality

With the program IGEL2D you can enclose bearing data interactively, supported by graphical output on the screen. So you can vary several specific parameters and will see the results instantly. You can vary the following parameters:

• automatic or manual search for the next border point
• maximum distance between two neighbour border points
• size of the clipping rectangle

Input-Files

1. (req) general input data (filetype igel2d.dat)
2. (req) bearing data (filetype geom.dat)
3. (req) layout file (filetype layout.dat)
4. (opt) unfinished borderline around the bearing data (filetype rand.dat

Output-Files

1. borderline around the bearing data (filetype rand.dat)
2. (opt) modified bearing data file(s) (filetype geom.dat):

   • file containing all bearing data lying inside the borderline
   • file containing all bearing data lying outside the borderline

3. (opt) file of type gkslog.dat (terminal protocol). This file enables the user to rerun a session a second time! You can finish even sessions that were interrupted through program break!

Methodology

• automatical search: radar beam method

A beam circles around the actual border point with a constant diameter anticlockwise. The diameter is two times greater than the maximum distance between two neighbour border points. The beginning angle of this beam is set so that the last but one border point will not be found. The new border point has a minimum angle difference in relation to the beginning angle

• manual search:

The user sets the coordinates of the new point within the clipping rectangle by mouse-click. The program looks for the nearest bearing data point. This will be the next border point.

• With the automatical search, you have not only a hull around your bearing data, but also the guarantee, that this borderline will be sorted anticlockwise.

Program(s) to run before this Program

SYNGRID,TEO

Program(s) to run after this Program

ARCGIS,ArcGIS-Applications

Additional Information

Language

Fortran90

Additional software

-

Original Version

J. Jürges

Maintenance

working group PRE

Documentation/Literature

$PROGHOME/examples/igel2d

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