[GRASS-user] displaying lines between given points

Luca Casagrande luca.casagrande at gmail.com
Tue Aug 1 07:40:35 EDT 2006


Alle 11:56, martedì 01 agosto 2006, Moritz Lennert ha scritto:
> Hi,
>
> A colleague of mine has a data set with airports (and their coordinates)
> and flights between these airports, i.e. something like this:
>
> x1 y1 x2 y2 flights
>
> He wants to display these connections as lines between the airports,
> whose line width is proportional to the number of flights.
>
> Anyone have a great idea of how to do this in GRASS ? I currently see
> the following possibility:
>
> 1) use awk to transform the file into an ascii vector line file, i.e.:
>
> L 2 1
> x1 y1
> x2 y2
> 1 flights
>
> 2) import with v.in.ascii
>
> 3) select distinct values from the cats column
>
> 4) loop through those distinct values and d.vect with line width set to
> cats value * scale
>
For line depth you can use the buffer feature...you can set the extension of 
the buffer by the number of flight between airport.

Can it works?

Bye
Luca

-- 
"Chiunque può simpatizzare col dolore di un amico, ma solo chi ha un animo 
nobile riesce a simpatizzare col successo di un amico (Oscar Wilde)"

LINUX User #411601
GENTOO-GIS Development Team
jabber: casagrande at jabber.linux.it

 




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