Geo-Visualization in FoodChain-Lab

Topics

Learn

  • to visualize the delivery network on a map.
  • about the advantages of selecting stations in the graph mode and in the GIS mode.
1

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  • Import the Example Workflow from “FCL_Example.zip”.
  • Open the Tracing View by double-clicking on it.
2

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  • Now you should see a graphical representation of the delivery network.
  • To switch to the geographical representation click “Switch to GIS” in the upper right corner.
3

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  • The country borders originate from a shapefile which has been included in the KNIME workflow via the Shapefile Reader. Shapefiles are a good way to visualize networks on a map if there is no internet connection.
  • To zoom to a certain area of the graph use the mouse wheel. By pressing down the left mouse button and moving the mouse you can move the map (works as in Google Maps).
4

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  • If you are online, you can change the GIS Type. If you select “Mapnik”, for example, you can see a visualization with OpenStreetMap data.
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  • We can now select certain stations based on geography: To select all stations in Poland press the “Shift” key on the keyboard, press the left mouse button and drag with the mouse a rectangle around the stations (everything at the same time).
  • The selected stations are now colored blue.
  • Switch back to the graphical view by clicking “Switch to Graph” in the upper right corner.
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  • The blue stations are the ones you selected in the geographical view, since changes you make in one view are automatically applied to the other view.
  • That makes it easy to switch back and forth between both representations, enabling you to use the benefits of both.
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  • Lets now select a certain “cluster” in the graphical view and see where the stations are in the geographical view.
  • So select the “cluster” in the red circle and click “Switch to GIS”.
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  • As you can see the stations of the cluster are located all over France.