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Visualizing and Editing Graphs

Visualizing and Editing Graphs (Under Construction)

STEM uses graphs as data structure to save information concerning population sizes, areas, spatial information, neighborhood of areas etc. When you start a scenario, you get the information of its appendent graphs in a visual form, e.g. when you see the outlines of the countries you included into you scenario.

The Graph Editor offers the possibility to visualize graphs without starting a scenario. You can get an overview of the data and edit titles, the size of the area, add populations or adjust geographic information of a node.


Step 1. Open the Editor

When you right-click on the item "Models" within a project of the STEM Explorer, you'll see a context-menu that offers you to display the canonical graph of all graphs that are contained in your project models. When you right click on a specific model, you can display the canonical graph of all graphs that belong to your selected model. When you right-click on a selected graph under your models or the graphs folder, you'll be able to open the graph editor for this graph file.

Step 2. Editing the graph

The nodes of the graph are small circles, where the color shows the affiliation to one subgraph, i.e. when you have opened a canonical graph consisting of several countries, the country nodes will have different colors. When you click on a node (provided the graph contains nodes) you get information about its title, its URI and all labels that are assigned to this node. You can move the nodes by keeping the left mouse button pressed and drag the node to your desired location. When you want to add a label to a node (e.g. add information about population size or area of the node) you must select one node by left-clicking on it and open the context menu with a right click. You can then add a population or area label and edit the values in the bottom part of the editor.

Edges can also be selected. Information about the class of edge and potential edge values are shown in the bottom part of the display.


Step 3. Saving the graph

When you want to save the edits you have made, you can select "Save" (and the changes are saved into the same file) or you select "Save As" where you have to select a folder and filename. In both cases, a new file is created to which the new graph files refer. It contains the spatial information of the nodes.