4.5             Stream Polyline

 

Stream polyline are the drainage network for the region of interest obtained by the conversion of the link grid to the vector format from the raster. Each link segment forms an individual stream segment and connected at the junction points. Flow direction is used to ensure that the segments are topographically correct (i.e. FromNode and ToNode are consistent with the flow direction).

 

Figure x.x shows the stream polyline obtained corresponding to the link grid and flow direction grid obtained in the previous section for the synthetic grid.

 

 

In the Input section of the dialog browse the Link Grid and Flow Direction Grid generated by the step 4.4 and 4.2 respectively. In the Output section of the dialog browse the shape file name to which the Stream Polyline could be saved. At this point module is ready to run; select Run to begin processing. Please be patient until it completes processing. The text browser at the bottom of the dialog should provide information related to any error or processing. If the Load in Data Frame is checked the generated Stream Lines will be automatically loaded in the Qgis window. After the processing is complete you need to press Close to proceed to next step.