[Qgis-user] [Qgis-developer] About a 'directed' LINESTRING (e.g. for oneway streets)?

[Alexandre Neto]

Linestrings have a direction already, you can use marker lines with arrows
to represent the original direction. For analysis you can revert the
polyline direction using it's attributes, or using the switch the direction
of polyline plugin [1] to actually invert vertex order.

Alexandre Neto


[1] http://plugins.qgis.org/plugins/lineswitch/


On Sun, Sep 1, 2013 at 1:53 PM, Stefan Keller <sfkeller at gmail.com> wrote:

> I'm designing a spatial database and like to introduce a LINESTRING where
> the direction is important, e.g. to describe a oneway street or a water
> pipe. I indicate this by another attribute, e.g. "direction: BOOLEAN", or
> "direction: ENUM(both, as_is, reverse)
>
> A "directed line" means that the order of the coordinates of a linestring
> value is important - like in a directed graph - and needs to remain the
> same whatever happens to it e.g. when importing, storing, retrieving,
> analysing or rendering...
>
> Does anybody have had any issues to manage "directed lines" in QGIS (OGR,
> extensions, etc.)?
>
> Yours, Stefan
>
>
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