[GRASS-user] Snapping Points to Nodes along Lines

[Ryan R. Rosario]

Thanks. This does seem more in line with what I want to do. What is the
difference between operation=connect and operation=nodes?


Moritz Lennert-2 wrote:
> 
> On 29/09/08 01:44, Ryan R. Rosario wrote:
>> I have one vector map consisting of 30831 points, and another consisting
>> of a
>> road network. I have used the v.distance function followed by v.clean to
>> connect each point to the nearest road. I used the errors from v.clean to
>> obtain the intersections: basically, each point's projection onto a road.
>> 
>> #v.distance -p from=incidents to=roads out=connect upload=dist
>> column=dist
>> #v.patch roads,connect,points out=patched
>> #v.clean patched output=patched_clean err=intersections tool=break,snap
>> 
>> The problem is, the error layer (intersections) only contains 6715 points
>> but for my next step I need to have the same number of intersections as
>> data
>> points.
>> 
>> (In the next step, I want to take this layer of intersections (points)
>> and
>> locate the nearest point in another layer along a road, so I need to have
>> the same number of intersections as I have data points)
>> 
>> What am I misunderstanding about the v.clean process? Is there some way I
>> can fix this?
> 
> Don't have an answer to your question concerning v.clean, but you could 
> also use v.net with operation=connect.
> 
> Moritz
> 
> 
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
> 
> 

-- 
View this message in context: http://www.nabble.com/Snapping-Points-to-Nodes-along-Lines-tp19716703p19735421.html
Sent from the Grass - Users mailing list archive at Nabble.com.