Geomorphic Change Detection Software

FIS Library

The Fuzzy Inference System Library is where you load *.fis files so that they are available for use in the Error Calculations tab of the DEM Survey Properties dialog. In the FIS library, you can Add new FIS, Edit or configure an existing FIS and Remove items from the library. The topics at left discuss each of these operations.

GCD6_Form_FIS_Libraqry

Adding an FIS to the Library

To add an existing FIS is easy. Note that by default, when you install GCD no FIS files are loaded in the library, but

two example FIS files are included in the user’s roaming folder. These can be found at:

c:\Users\<YourUsername>\AppData\Roaming\GCD\FIS Sample Files

The two FIS files provided are examples of two input FIS where the inputs are slope and point density, and the output is elevation uncertainty. We do not automtically load FIS files into GCD’s Survey library as users should excercise judgement and caution in applying, calibrating and developing appropriate fuzzy inference sytems.

How it Actually Works

When you add a FIS to the library, this video shows what actually happens to the

FISLibraryXML.xml

file, which is stored in your

c:\Users\<YourUsername>\AppData\Roaming\GCD\FISLibrary 

folder.

Every time a FIS is added, another entry gets added to the

FISLibraryXML.xml

file:

<FISTable> ` 3 GPS_2Input_PD_SLP C:\Users\Joe Wheaton\AppData\Roaming\GCD\FIS Sample Files\GPS_2Input_PD_SLP.fis </FISTable>`

Removing a FIS from the Library

Removing a FIS from the library is as simple as highlighting it and clicking remove. When you remove a FIS from the library, it only removes it from the listing here (i.e. it deletes the corresponding

<FISTable>...</FISTable>

entry in the

FISLibraryXML.xml

file. It does not delete the actual *.fis file from your computer.

Editing a FIS in FIS Library

FIS files (*.fis) are an ASCII text format file that is compatible with the Matlab’s Fuzzy Logic Toolbox and can be edited in a text editor (e.g. Notepad ++), in Matlab’s Fuzzy Logic Toolobx using their FIS Editor, or in GCD using the Fuzzy Inference System Editor:

Dialog_FISLibrary_FIS_Editor

This video shows you how to edit an FIS using the Fuzzy Inference System Editor:

For more information on how fuzzy inference systems for elevation uncertainty work and can be created and modified, see the GCD Concept Reference documentation here.


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