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

[Stefan Keller]

Hi Alexandre

Thanks for the quick answer and the hint to the plugin LineSwitch (from
Underdark?).
Besides that the plugin page is'nt online currently for me - I'd like to
emphasize that my main question is about the reliability through all
processing steps to maintain the direction.
I actually want to hear if anybody had issues when importing/exporting
directed lines with OGR or analysing them with fTools or Sextante.

Yours, Stefan


2013/9/1 Alexandre Neto <senhor.neto at gmail.com>

> 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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>>
>
>
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