[Qgis-user] drawing arrows/ lines at desired angles

[Andreas Neumann]

 Hi,

 You can read in the data from a text file with the "Add delimited text 
 layer" plugin. In your screenshot it seems like all symbols have the 
 same field of view and the same distance from the original point. So you 
 could create a fixed SVG symbol containing this pie angle (make sure it 
 actually starts from the center of the quadratic SVG viewbox) and then 
 you could draw the point symbols three times using data defined rotation 
 fields.

 I don't see a big problem implementing such a graphical representation. 
 It would be more complex if distances and field of view were different 
 for each antenna.

 Hope this helps?

 Andreas

 On Sat, 16 Jul 2011 16:14:48 +0530, Dr. Satyaprakash wrote:
> Hi,
>
> I am trying to draw arrows/ lines at specific angles. How to do the
> same in QGIS?
>
> I have the location of Mobile transmission towers. I also have the
> angles in which the transponders are fixed. I would like to show the
> direction of the transponders at each of the tower location. I am
> attaching a snapshot.
>
> The data would be something like,
>
> Long, Lat, Dir1, Dir2, Dir3
> 88.42139816,26.70509683,20,120,280
>
> Dir1, Dir2 and Dir3 are the angle in degrees from North in which the
> transponders are oriented. Ideally I would like to plot something 
> like
> as in the attached sample, however, even a arrow/ line in those
> directions would do. QGIS should read the file, plot the location
> using Lat and Long and then use the three directions to plot arrows/
> lines.
>
> Looking forward to your help.
>
> Rgds,
> Satyaprakash

-- 
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 Andreas Neumann
 Böschacherstrasse 10A
 8624 Grüt (Gossau ZH)
 Switzerland