Hi Micha,
you are a champ. Thanks heaps that works really well.
I had a few issues with v.in.lines as there was a line created after the
protocol but it wasn't. I think the file wasn't read properly.
It worked when I used the command with the in=- option and copying the x
y coordinates in the Terminal.
Thanks again.
Cheers,
Harald
On 17/04/12 21:42 , Micha Silver wrote:
On 04/17/2012 02:13 PM, G. Allegri wrote:
Now run v.distance as:
v.distance from=gps_point to=river_line upload=to_along
column=along out=connectors
# The output parameter hold the line segments connecting each
point to the river_line. It's required by the module to run, by
has no significance for you.
I have never tested the to_along upload type, but what is considered
the "to" nearest point in this case? I mean, you will have the
original points located on the endpoints of the line, isn't the
nearest point the endpoint itself?
IIUC, v.distance finds the distance along the line from each point to
the *vertex* on the line closest to that point.
But in this particular case, since we're creating the line from the
same input points, the line vertices and the points are all the same,
so I think it shouldn't matter. The distance from the points to the
nearest vertex will always be 0, and 'to_along' should give the
distance along the line to that vertex=point.
If I'm wrong, someone on the list with more experience will jump up...
giovanni
Cheers,
Micha
Help would be really appreciated. And I am sorry if that has
been asked before but I couldn't find a thread dealing with that.
Best regards,
Harald
--
Micha Silver
052-3665918
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------------------------------
Harald Hofmann
Research Fellow PhD - Hydrogeology
School of Geosciences
Monash University
Wellington Road
Clayton, Victoria 3800
Australia
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