On 02/03/15 21:39, Daniel Victoria wrote:
Hi list,
I'm beginning to learn and use the v.net <http://v.net> tools in Grass
in order to evaluate the distance from several crop fields to a
processing plant.
I've successfully build the road network with the end nodes but now I'm
in doubt. My starting points in the analysis are crop fields, which are
polygons. So what is the best (or most common) practice?
1) Use the field centroids as starting nodes?
2) Add field polygon boundaries to the network and run v.net.distance
backwards (from mill to fields)?
3) Some other option?
I don't think that there is a best practice for this. It all depends on
your application and the desired outcome. Do you want average
time/distance from anywhere in the field to the plant ? Then probably
the centroid is ok. Or do you want distance from the point of the field
that is closest to the network ? Then you could get the coordinates of
that point through v.distance (with upload=to_x,to_y) and use these
points as nodes.
Also, if I'm to add the field boundaries to the network, how would I go
about it? Should I first v.patch the field with the roads layer and then
run v.net <http://v.net>?
Adding field boundaries still does not answer the question of where to
put the start/stop point of your paths...
If you want to add them to the network then yes, patching would be the
best option, AFAIK.
Moritz
Thanks
Daniel
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