Convert lines to areas

Q: Is there a way to construct a vector polygon map from closed line rings?

A: Yes, to convert a lines map into an area map, do:

Requirement: the line rings must be closed.

• run v.type to convert from line type to boundary type
• run v.centroids to add missing centroids to closed boundaries

Example:

 v.type input=map_l output=map_b type=line,boundary
 v.centroids input=map_b output=map_polygons

See also

• Convert points to lines