[Qgis-user] connect the dots

[morb.gis at beagle.com.au]

As a workaround, and assuming you can make your way around PostGIS, the
following might do what you're looking for:

http://postgis.refractions.net/docs/ST_MakeLine.html

quote:

Examples: Spatial Aggregate version

This example takes a sequence of GPS points and creates one record for each gps
travel where the geometry field is a line string composed of the gps points in
the order of the travel.

SELECT gps.gps_track, ST_MakeLine(gps.the_geom) As newgeom
	FROM (SELECT gps_track,gps_time, the_geom
			FROM gps_points ORDER BY gps_track, gps_time) As gps
	GROUP BY gps.gps_track



Brendan

Quoting Declan Troy <declan.troy at gmail.com>:

> Hey Richard,
>
> Thanks for the response. Indeed fTools was the first place I looked
> as it seemed the type of functionality that might be there. Perhaps
> some day, or maybe in the rumored Ecological toolbox?
>
> Seemed like the type of operation that many users might have cause to
> use so I was hoping there was an easy way I was just overlooking but
> perhaps I misjudged. Once I get around to learning to write python
> plugins this should be a nice project to start on. Until then I can
> do this outside of QGIS, I'm just periodically attempting to see how
> far I can get in the hopes of shifting over. Each version keeps
> getting better.
>
> Declan
>
>
> On Nov 9, 2009, at 6:19 AM, Richard Duivenvoorde wrote:
>
> >
> >> Is there a mean in QGIS to convert a series of points to a polyline?
> >> I would like to create some tracklines from series of telemetry
> >> points to summarize movement/migration paths. I hope I've overlooked
> >> something but the commands I see tend to be dissolution rather than
> >> aggregation of features.
> >
> > Hi Declan,
> >
> > don't know a tool like that (but I'm not authorative for that...),
> > but the
> > first thing I think of is the fTools-functionality of Carson Farmer
> > (in
> > Vector menu of Qgis). It already does things like that. Maybe it's
> > worth a
> > feature request to him?
> >
> > Another option would be to write a python plugin for it? Or add it
> > to the
> > plugin-wishes list if you do not want to do it yourself:
> > http://www.qgis.org/wiki/Vector_Support_Wishes
> >
> > Regards,
> >
> > Richard Duivenvoorde
> >
>
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