[GRASS-user] Converting points to lines

GRASS GRASS user
1

Hi,
6.2 is beautiful work.
I have just upgraded to 6.2 from 5.4 on Linux. Is there a way to convert
a points vector (imported sites file from 5.4) to a line vector?

Thanks,

Bob Cooper

2

Hi Bob,

searching the archives reveals something posted by myself sometime
ago. note that it was somewhat of a hack using awk:

http://grass.itc.it/pipermail/grassuser/2005-March/028092.html

cheers,

dylan

On 12/7/06, Bob Cooper <bcoop@neaq.org> wrote:

Hi,
6.2 is beautiful work.
I have just upgraded to 6.2 from 5.4 on Linux. Is there a way to convert
a points vector (imported sites file from 5.4) to a line vector?

Thanks,

Bob Cooper

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http://grass.itc.it/mailman/listinfo/grassuser

3

here are the examples I was thinking of:

awk 'BEGIN{print "VERTI:"; n = 0} {vertex = $6" "$7; if( (n > 0 && n < 3) )
{print "L 2\n"old_vertex"\n"vertex} else if(n >2
) {print "L 2\n"old_vertex"\n"vertex}; old_vertex = vertex; ;n++}' walk1.raw

walk1.ascii

#save CAT in third column
awk 'BEGIN{print "VERTI:"; n = 0} {vertex = $6" "$7; if( (n > 0 && n < 3) )
{print "L 2\n"old_vertex" " n"\n"vertex,n+1} els
e if(n >2 ) {print "L 2\n"old_vertex" "n" \n"vertex,n+1}; old_vertex =
vertex; ;n++}' walk1.raw

v.in.ascii in=walk1.ascii out=walk1_line fs=" " format="standard" columns='x
double precision,y double precision, cat int' ca
tcol=0

note that 'walk1.raw' is a dump from a garmin gps 12 - via gpstrans.

cheers,

Dylan

On Thursday 07 December 2006 22:26, Dylan Beaudette wrote:

Hi Bob,

searching the archives reveals something posted by myself sometime
ago. note that it was somewhat of a hack using awk:

http://grass.itc.it/pipermail/grassuser/2005-March/028092.html

cheers,

dylan

On 12/7/06, Bob Cooper <bcoop@neaq.org> wrote:
> Hi,
> 6.2 is beautiful work.
> I have just upgraded to 6.2 from 5.4 on Linux. Is there a way to convert
> a points vector (imported sites file from 5.4) to a line vector?
>
> Thanks,
>
> Bob Cooper
>
>
> _______________________________________________
> grassuser mailing list
> grassuser@grass.itc.it
> http://grass.itc.it/mailman/listinfo/grassuser

--
Dylan Beaudette
Soils and Biogeochemistry Graduate Group
University of California at Davis
530.754.7341

4

Dylan,

Thank you. The conversions went great.

Bob Cooper.

On Fri, 2006-12-08 at 10:45 -0800, Dylan Beaudette wrote:

here are the examples I was thinking of:

awk 'BEGIN{print "VERTI:"; n = 0} {vertex = $6" "$7; if( (n > 0 && n < 3) )
{print "L 2\n"old_vertex"\n"vertex} else if(n >2
) {print "L 2\n"old_vertex"\n"vertex}; old_vertex = vertex; ;n++}' walk1.raw
> walk1.ascii

#save CAT in third column
awk 'BEGIN{print "VERTI:"; n = 0} {vertex = $6" "$7; if( (n > 0 && n < 3) )
{print "L 2\n"old_vertex" " n"\n"vertex,n+1} els
e if(n >2 ) {print "L 2\n"old_vertex" "n" \n"vertex,n+1}; old_vertex =
vertex; ;n++}' walk1.raw

v.in.ascii in=walk1.ascii out=walk1_line fs=" " format="standard" columns='x
double precision,y double precision, cat int' ca
tcol=0

note that 'walk1.raw' is a dump from a garmin gps 12 - via gpstrans.

cheers,

Dylan

On Thursday 07 December 2006 22:26, Dylan Beaudette wrote:
> Hi Bob,
>
> searching the archives reveals something posted by myself sometime
> ago. note that it was somewhat of a hack using awk:
>
> http://grass.itc.it/pipermail/grassuser/2005-March/028092.html
>
> cheers,
>
> dylan
>
> On 12/7/06, Bob Cooper <bcoop@neaq.org> wrote:
> > Hi,
> > 6.2 is beautiful work.
> > I have just upgraded to 6.2 from 5.4 on Linux. Is there a way to convert
> > a points vector (imported sites file from 5.4) to a line vector?
> >
> > Thanks,
> >
> > Bob Cooper
> >
> >
> > _______________________________________________
> > grassuser mailing list
> > grassuser@grass.itc.it
> > http://grass.itc.it/mailman/listinfo/grassuser