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IV. River Network Extraction from DEM

Here it is assumed that you have successfully downloaded a DEM from the USGS website.

  1. On the “Topography Database” tree, double click the DEM that you imported.
  2. The “DEM and Derived Quantities” window should pop up.

    Cuencas open DEM.

    Cuencas open DEM.

  3. Click the “Get Network” button. This will activate the “Network Extraction Options” window.

    Network extraction options.

    Network extraction options.

  4. Click the “Apply Condition button” and the click “Start”. You will be able to see the algorithm progress by checking the Optimization and Extraction progress bars. If you want to see more details about the extraction process you can open your Windows Command Prompt

    Optimization and Extraction

    Optimization and Extraction


  5. The process takes about 3 minutes for the DEM we downloaded in step I of this tutorial.
  6. Once it’s done, click the “Exit” button, and the hit the “Open” button on the “DEM and Derived Quantities” window.
  7. Click the “Plot Network” icon . and select the “Show All Orders Box”. If your CUENCAS Screen looks like the figure below, you have successfully imported and processed your DEM:

    Successful DEM import.

    Successful DEM import.


  8. As a final step, display the Blue Lines you imported. First, select the “Vectors” tab in the left panel. Then, check the “483105.HY.dlg” box (located under the “Available DLG files” frame).

    The final step.

    The final step.


  9. Your screen should now display all your data.

    A display of all the data.

    A display of all the data.


Last modified on January 17th, 2013
Posted on January 17th, 2013