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.