[Qgis-user] polygons' digitizing direction

Bernhard Ströbl bernhard.stroebl at jena.de
Wed Aug 29 03:34:49 PDT 2012


Dear All,

AFAIK it is a general rule that walking along a polygon's edge in 
digitizing direction the inside of the polygon is to the right, that 
means that the polygon's exterior boundary ist to be digitized clockwise 
(cw) and any hole counter clockwise (ccw).
When digitizing polygons in QGIS I can do it either cw or ccw, same for 
holes. When working in a shape file saving a polygon digitized ccw the 
boundary is reversed and the polygon thus corrrectly saved. If working 
in a PostGIS layer the direction is saved as is, i.e. either cw or ccw.
Is this on purpose or a bug?

Bernhard


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