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4 Data selection

The map roads contains the most important roads throughout Germany. The roads of the Federal State of Lower Saxony are only supposed to be interesting for a project. In order to extract them, those road vectors are selected from the map roads based on the political borders of Lower Saxony (map pol_borders_nds), which lead throughout the Federal State of Lower Saxony. For this purpose use the module v.select:

v.select ain=roads bin=pol_borders_nds out=nds_roads