<div dir="ltr">Hi Alexandre<div><br></div><div>Thanks for the quick answer and the hint to the plugin LineSwitch (from Underdark?).</div><div>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.</div>
<div>I actually want to hear if anybody had issues when importing/exporting directed lines with OGR or analysing them with fTools or Sextante. </div><div><br></div><div>Yours, Stefan</div></div><div class="gmail_extra"><br>
<br><div class="gmail_quote">2013/9/1 Alexandre Neto <span dir="ltr"><<a href="mailto:senhor.neto@gmail.com" target="_blank">senhor.neto@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr"><div>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.</div>
<div><br></div><div>Alexandre Neto</div><div><br></div><div><br></div><div>[1] <a href="http://plugins.qgis.org/plugins/lineswitch/" target="_blank">http://plugins.qgis.org/plugins/lineswitch/</a><br></div></div><div class="gmail_extra">
<br><br><div class="gmail_quote"><div><div class="h5">On Sun, Sep 1, 2013 at 1:53 PM, Stefan Keller <span dir="ltr"><<a href="mailto:sfkeller@gmail.com" target="_blank">sfkeller@gmail.com</a>></span> wrote:<br></div>
</div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div dir="ltr">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) <div>
<div><br></div><div>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... </div>
<div><br></div><div>Does anybody have had any issues to manage "directed lines" in QGIS (OGR, extensions, etc.)?<br><div><br></div><div>Yours, Stefan</div><div><br></div></div></div></div>
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