Re: [GRASS-user] displaying lines between given points
Luca Casagrande <luca.casagrande <at> gmail.com>
2006-08-01 11:40:35 GMT
Alle 11:56, martedì 01 agosto 2006, Moritz Lennert ha scritto:
> 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?
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