Hey Giovanni et al.,
Yup, you correctly described the situation, a series of points with
associated times that I want to link in order. Should be pretty
straightforward. The birds I track like to complicate things a bit
by weaving back and forth across 180° but that is a side issue.
An ideal project to learn python scripting on but I'll hedge my bets
and send Richard a sample data set on the odds that his group will
get to it faster than I will (thanks Richard).
And thank you Brendan for the PostGIS example. PostGIS is also on the
list of things to delve into but a bit further down the list to
learn. The simplicity of the solution makes another case for trying
to get there sooner than later.
Thanks for the interest and responses to my query.
Declan
On Nov 10, 2009, at 12:10 PM, G. Allegri wrote:
Hi Declan,
I had the same need some time ago, but than I decided to follow
different ways in my analysis so I didn't went on on with this. You're
talking about migration paths, so I suppose you have temporal
attributes on your points, or some other kind of sequential index that
makes points logically connected. Right? In such case it wouldn't be
difficult with little scripting: just sort them on the index, and then
loop over their coordinates to build the polyline. It would a nice,
simple, exercise I think... or...am I making things too simple?
bye,
giovanni
2009/11/10 Declan Troy <[email protected]>:
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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