To install Stream Feature Extractor, use the plugin manager in QGIS:
Plugins –> Fetch Python Plugins
Search for ‘Stream Feature Extractor’, select it and click the install button. The plugin will now be added to your plugins menu.
Load a vector line layer to QGIS and select it.
Find Stream Feature Extractor icon in tool bar, click it to extract the features from your layer.
You can also do it from menu bar:
Vector –> Stream feature extractor –> Extract stream features from current layer.
Stream Feature Extractor documentation
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