[GRASS-user] displaying lines between given points

[Moritz Lennert]

Luca Casagrande wrote:
> 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?

I probably could, but I think working with the 'width' option of d.vect 
just seems easier.

Moritz