v.flip is a Bourne Shell and Awk script. The output vector map contains all lines that have a category in the given layer of the input vector map. Lines specified in cat have their direction flipped.
The input layer number and category numbers are preserved in the output. If a datatable is attatched to the input vector map's layer, it will be copied under the output vector map's name and connected to the output vector map, in the same database where the input layer's table is stored.
1. Requires GRASS 6.x.
v.flip was tested only in metric Locations. I can't guarantee it will work properly
in latlong or unprojected xy Locations, as v.clean is used internally
with a fixed snapping distance of 0.0001 for connecting flipped and non-flipped lines.
2. Newer GRASS 6.x versions provide tool=flip in v.edit. Use it instead. It's faster, more reliable and supported by core developers.
2. Only lines with categories will be flipped. Use v.category to adjust category assignment first, if needed.
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