4.3             Stream Grid

 

Stream Grid is a raster equivalent of the stream network. Those Flow Accumulation Grid having value equal or greater than the threshold value user provides with, are marked 1. Physically threshold implies the number of cells draining to a particular cell is greater than the given value should be classified as a stream. Rest of the grid assumes No Data Value.

 

Figure x.x shows stream grid generated when a threshold value of 2 is applied to the flow accumulation grid produced in the previous section.

 

 

 

 

In the Input section of the dialog browse the Flow Accumulation Grid generated by the step 4.2. In the Output section of the dialog browse the file name to which the stream grid could be saved. Also it is required to provide an “integer” value for the threshold. Any Flow Accumulation Grid with having value greater than threshold will be classified as a stream grid. 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 Stream Grid will be automatically loaded in the Qgis window. After the processing is complete you need to press Close to proceed to next step.