3 Using the outputs
Once the alert level is estimated it is uploaded including the network and the observations. The alert level can be visualized in the left column of the GIS. Clicking the info bottom shows the meta information, which includes a link to the XML Resource and the style-sheet transformed XDSL (also XML) resource. The XDSL resource can be loaded into the software GENIE and the alert level process can be discovered interactively. The details are explained below.
3.1 Data visualization with the Web GIS
- The GIS including all alert level features
In the left, the Exupery GIS is show including the alert level features. Thus the alert level can be visualized and the resources can be downloaded which allows to open the alert level in the GENIE software. In order to do this the following steps are required (compare with figure):
1.) Open the Global settings dialog.
2.) Add the Alert Level, this will open the Alert Level Box in the left navigation area.
3.) Click the Info Buttom, which will open up the info Box in the center bottom.
4.) Click the XDSL link. The network can be saved in xdsl format.
3.2 Data visualization and inference with GeNIe
- The data opened in the free GeNIe software
The downloaded XML file can be loaded into GeNIe. Therefore execute the following commands:
- Rename the .xml ending of the downloaded filename with .xdsl. Otherwiese GeNIe does not allow you to open the file
- Start GeNIe, and click File/Open Network. This will open a search dialog. Select the renamed download file (File of type: GeNIe Files (*.xdsl, *.dsl))
- Right click in the rectangular area where the network is loaded into and click View Nodes As/Bar Chart. This allows you to actually see the probabilities of the network.
- The beliefs can be updated automatically, while clicking on the bars in the rectangular boxes (i.e. setting the evidence). Therefor click Network/Update Immediately.
- In order to load the observations into the network first open the Case Manager dialog by clicking View/Case Manager, second click on the right arrow denoted by the 1 in the figure above.
Now the network including all the observations (cases) are loaded into GeNIe. The volcanologist can interactively change the observations and see the probabilities in order to understand why the network has given a certain alert level. For example the observations (called evidence) by simply clicking on the colored bars in the rectangular nodes.
(The used bayesian network is a modified version of a bayesian network originally provided by Willy Aspinall.)